IL-13 BINDING AGENTS CROSS-REFERENCE TO RELATED APPLICATIONS [0001 ] This application claims priority to U.S. Patent Application Serial No. 60/581,078, filed on June 17,2004, under 35 U.S.C. § 119, and claims priority to U.S. Patent Application Serial No. 11/ , filed on June 9,2005, titled "ANTI-IL-13 ANTIBODIES AND COMPLEXES" and bearing attorney docket number 16163-029001. The contents of the aforementioned applications are hereby incorporated by reference. SEQUENCE LISTING [0002] This application incorporates the sequence listing submitted as [to be entered at a later date]. BACKGROUND [0003] Interleukin-L3 (IL-13) is a cytokine secreted by T lymphocytes and mast cells (McKenge et al. (1993) Proc. Natl. Acad. Sci. USA 90:3735-39; Bost et al. (1996) Immunology 87:663-41). IL-13 shares several biological activities with IL-4. For example, either IL-4 or EL-13 can cause IgE isotype switching in B cells (Tomkinson et al. (2001) J. Immunol. 166:5792-5800). Additionally, increased levels of cell surface CD23 and serum CD23 (sCD23) have been reported in asthmatic patients (Sanchez-Cuererro et al. (1994) Allergy 49:587-92; DiLorenzo et al. (1999) Allergy Asthma Proc. 20:119-25). In addition, either EL-4 or EL-13 can upregulate the expression of MHC class U and the low-affinity IgE receptor (CD23) on B cells and monocytes, which results in enhanced antigen presentation and regulated macrophage function (Tomkinson et al., supra). Importantly, either IL-4 or IL-13 can increase the expression of VCAM-1 on endothelial cells, which facilitates preferential recruitment of eosinophils (and T cells) to the airway tissues (Tomkinson et al., supra). Either IL-4 or IL-13 can also increase airway mucus secretion, which can exacerbate airway responsiveness (Tomkinson et al., supra). These observations suggest that although IL-13 is not necessary for, or even capable of, inducing Th2 development, IL-13 may be a key player in the development of airway eosinophilia and AHR (Tomkinson et al., supra; Wills-Karp et al. (1998) Science 282:2258-61). SUMMARY [0004] We have discovered, inter alia, IL-13 binding agents, in particular, anti- IL-13 antibody molecules can bind to human IL-13 and/or cynomolgus monkey 1L-13, with high affinity and specificity. In one embodiment, the antibody molecules reduce at least one IL-13-associated activity, e.g., modulation of an inflammatory condition. For example, the anti-IL-13 antibody molecules can bind to IL-13 and modulate, e.g., inhibit, an interaction (e.g., binding) between IL-13 and an IL-13 receptor, e.g., IL-13 receptor al ("IL-13Ral), IL-13 receptor a2 ("lL-13Ra2"), and''''or the interleukin-4 receptor alpha chain ("IL-4Rct"), thereby reducing or preventing signal transduction, [0005] An IL-13 binding agent, such as an anti-IL-13 antibody molecule can be used to modulate (e.g., inhibit) at least one IL-13-associated aqtivity in vivo. The IL-13 binding agent can be used to treat ot prevent an IL-13 associated-disorder, or to ameliorate at least one symptom thereof. Exemplary IL-13 associated disorders include inflammatory disorders (e.g., lung inflammation), respiratory disorders (e.g., asthma, including allergic^and non-allergic asthma, chronic obstructive pulmonary disease (COPD)), as well as conditions involving airway inflammation, eosinophilia, fibrotic disorders (e.g., cystic fibrosis, liver fibrosis, and pulmonary fibrosis), scleroderma, excess mucus production; atopic disorders (e.g., atopic dermatitis, urticaria, eczema, allergic rhinitis, and allergic enterogastritis), an IL-13 associated cancer (e.g., a leukemia, glioblastoma, or lymphoma, e.g., Hodgkin''''s lymphoma), gastrointestinal disorders (e.g., inflammatory bowel diseases), liver disorders(e.g., cirrhosis), and viral infections. [0006] An IL-13 binding agent can be a protein, e.g., an antibody molecule, a pcptide, or a scaffold domain, that interacts with, e.g., binds to and/or inhibits IL-13, in particular, mammalian IL-13, e.g., human or nonhuman primate IL-13. The antibody molecule can be an isolated antibody molecule. In one embodiment, the binding agent is an antagonist, e.g., a binding agent that neutralizes, reduces and/or inhibits one or more IL-13-associated activities, including but not limited to, induction of CD23 expression; production of IgE by human B cells; phosphorylation of a transcription factor, e.g., STAT protein (e.g., STAT6 protein); antigen-induced eosinophilia in vivo; antigen-induced bronchoconstriction in vivo; or drug-induced airway hyperreactivity in vivo, among others. For example, the binding agent has a statistically significant effect in one or more assays described herein. Beside anti-IL-13 antibody molecules, other IL-13 binding agents that can be used include IL-13 receptor-Fc fusions, other soluble forms of the IL-13 receptor, soluble forms of LL-4Ro, antibodies that bind to IL-13R, and other molecules that inhibit the interaction between IL-13 and one of its receptors. [0007] In one aspect, the invention features an IL-13 binding agent that that binds to IL-13, e.g., with an affinity corresponding to a KD of less than 5 * 10"7 M, 1 x 10''''7 M, 5 x 10"8,1 x 10''''8,5 x 10''''9,1 x 10''''9 M, more typically less than 5 x 10''''10, 1 * 10"to, 5 x 10''''11 M, 1 x 10''''" M, or better. The EL-13 binding agent can be, for example, an antibody molecule that includes first and second immunoglobulin variable domain sequences that include at least a sufficient portion of an immunoglobulin variable domain to form an antigen-binding site that binds to EL-13. Typically, the first and second immunoglobulin variable domain sequences correspond to immunoglobulin variable domain sequences of a heavy and light chain, e.g., a paired or otherwise compatible heavy and light chain. [0008] In one embodiment, the IL-13 binding agent binds to one or more of the following peptides: FVKDLLVHLKKLFREGQnoFN (SEQ ID NO:1), FVKDLLVHLKKLFREGRisoFN (SEQ ID N0:2), FVKDLLLHLKKLFREGQi3oFN (SEQ ID NO:3), FVKDLLLHLKKLFREGRiaoFN (SEQ ED NO:4), FVKDLLVHLKKLFREG (SEQ ID NO:5), and FVKDLLLHLKKLFREG (SEQ ID N0:6), e.g., as isolated peptides, or to an amino acid within such a peptide when the peptide is folded in the structure of a mature IL-13 protein. [0009] For example, the IL-13 binding agent can bind to a peptide or to an IL-13 with comparable affinity (e.g., affinities that differ by less than a factor of 8,5, 4, or 2), regardless of whether R or Q is present at position 130. In particular, the IL-13 binding agent may bind with equal affinity to the peptide or the IL-13 regardless of whether R or Q is present at position 130. [0010] The IL-13 binding agent may bind to one or more of the following peptides: KDLLVHLKKLFREGQFN (SEQ ID N0:7), KDLLVHLKKLFREGRFN (SEQ ED N0:8), KDLLLHLKKLFREGQFN (SEQ ED N0:9), KDLLLHLKKLFREGRFN (SEQ ID NO: 10), KDLLVHLKKLFRE (SEQ ID NO: 11), . KDLLLHLKKLFRE (SEQ ID NO:12), and HLKKLFRE (SEQ ID NO:13), e.g., as isolated peptides. or to an amino acid within such a peptide when the peptide is folded in the structure of a mature IL-13 protein. The IL-13 binding agent can bind to an epitope on IL-13 that includes at least one (e.g., one, two, three or four) amino acid residues from a peptide sequence recited herein (e.g., in FIG. IB), or a corresponding peptide which differs by at least one, but no more than one, two or three amino acid residues, e.g., a corresponding peptide from human IL-13. ^—**?r [0011} In one embodiment, the IL-13 binding agent contacts (e.g., makes a van der Waals contact with) an amino acid residue in helix D (amino acid residues 114-130) of full-length IL-13 (SEQ ID N0:24 or SEQ ID N0:178), e.g., one or more of the following amino acid residues: residue 116,117,118,122,123,124,125,126,127, or 128ofSEQIDNO:24orSEQIDNO:178. In one embodiment, the IL-13 binding agent binds to an epitope on helix D, or an epitope that includes at least one amino acid residue (e.g., at least one, two, three, or four) on helix D, and/or may inhibit interaction of EL-13 with one or both of IL-13Rctl and/or IL-13Ro2. Helix D corresponds to amino acid residues 95-111 of mature, processed IL-13 (SEQ ID NO: 14 or SEQ ID NO-.124). [0012] In one embodiment, the IL-13 binding agent specifically binds to an epitope, e.g., a linear or a conformationai epitope, of IL-13, e.g., mammalian, e.g., human IL-13, For example, the IL-13 binding agent competes with MJ 2-7 and/or C65 for binding to IL-13, e.g., to human IL-13. The IL-13 binding agent may competitively inhibit binding of MJ 2-7 and/or C65 to IL-13. The IL-13 binding agent may specifically bind at least one amino acid in an epitope defined by MJ 2-7 binding to human IL-13 or an epitope defined by C65 binding to human EL-13. In one :mbodimt:nt, the IL-13 binding agent may bind to an epitope that overlaps with that of vlJ 2-7 or C65, e.g., includes at least one, two, three, or four amino acids in common, >r an epitope that, when bound, sterically prevents interaction with MJ 2-7 or C65. [0013] In still another embodiment, the IL-13 binding agent specifically binds at least one amino acid in an epitope defined by IL-13Ral binding to human EL-13 or an epitope defined by IL-13Ra2 binding to human IL-13, or an epitope that overlaps with such epitopes. The IL-13 binding agent may compete with IL-13Ral and/or EL-13Ra2 for binding to EL-13, e.g., to human IL-13. The IL-13 binding agent may competitively inhibit binding of IL-13Ral and/or IL-13Ra2 to IL-13. The EL-13 binding agent may interact with an epitope on IL-13 which, when bound, sterically prevents interaction with IL-13Ral and/or EL-13Ra2. » [0014] In one embodiment, the IL-13 binding agent has a functional activity comparable to JDL-13Ra2, e.g., the IL-13 binding agent reduces or inhibits IL-13 interaction with IL-13Ral. The IL-13 binding agent may prevent formation of a complex betweerrlfe?13 and EL-13Ral or disrupt or destabilize a complex between IL-13 and IL-13Rctl. In one embodiment, the IL-13 binding agent inhibits ternary complex formation, e.g., formation of a complex between EL 13, IL-13Rccl and IL4-R. [0015] In one embodiment, the IL-13 binding agent can inhibit one or more IL-13-associated activities with an ICso of about 50 nM to 5 pM, typically about 100 to 250 pM or less, e.g., better inhibition. Agents that inhibit at least one activity of IL-13 are considered IL-13 antagonists. In one embodiment, the IL-13 binding agent can associate with IL-13 with kinetics in the range of 103 to 10* M~''''s~l, typically 104 to 107 NT''''s"''''. In yet another embodiment, the EL-13 binding agent has dissociation kinetics in the range of 10"2 to 10"* s"1, typically 10"2 to 10"5 s"1. In one embodiment, the IL-13 binding agent binds to IL-13, e.g., human IL-13, with an affinity and/or kinetics similar (e.g., within a factor 20,10, or 5) to monoclonal antibody MJ 2-7 or C65, or modified forms thereof, e.g., chimeric forms or humanized forms thereof (e.g., a humanized form described herein). The affinity and binding kinetics of an IL-13 binding agent can be tested using, e.g., biosensor technology (BIACORE™). [0016] The IL-13 binding agent can be an antibody molecule, e.g., an antigen- binding fragment of an antibody (such as a Fab, F(ab'''')2, Fv or a single chain Fv fragment) or an antibody that includes an Fc domain. Typically, an anti-IL-13 antibody molecule is monoclonal or a mono-specific. [0017] The IL-13 binding agent, particularly an anti-IL-13 antibody molecule, can be an effectively human, human, humanized, CDR-grafted, chimeric, mutated, affinity matured, deimmunized, synthetic or otherwise in vitro-generated protein. In one embodiment, the IL-13 binding agent is a humanized antibody. In one embodiment, the IL-13 binding agent is not antigenic in humans or does not cause a KAMA response. [0018] In one embodiment, the IL-13 antibody molecule includes a heavy and light chain. The heavy and light chains of an anti-IL-13 antibody molecule can be substantially full-length (e.g., an antibody molecule can include at least one, and preferably two heavy chains, and at least one, and preferably two light chains) or can include an antigen-binding fragment (e.g., a Fab, F(ab'''')2, Fv or a single chain Fv fragment). In yet other embodiments, the antibody molecule has a heavy chain constant region chosen from, e.g., the heavy chain constant regions of IgGl, IgG2, IgG3, IgG4, IgM, IgAl, IgA2, IgD, and IgE; particularly, chosen from, e.g., the heavy chain constant regions of IgGl, IgG2, IgG3, and IgG4, mote particularly, the heavy chain constant regions IgGl (e.g., human IgGl). Typically the heavy chain constant region is human or a modified form of a human constant region (e.g., as described in Example 5). In another embodiment, the antibody molecule has a light chain constant region chosen from, e.g., the light chain constant regions of kappa or lambda, preferably kappa (e.g., human kappa). In one embodiment, the constant region is altered, e.g., mutated, to modify the properties of the antibody molecule (e.g., to increase or decrease one or more of: Fc receptor binding, antibody glycosylation, the number of cysteine residues, effector cell function, or complement function). For example, the human IgGl constant region can be mutated at one or more residues, e.g., one or more of residues 234 and 237, as described in Example 5. [0019] In one embodiment, the IL-13 binding agent (e.g., the anti-IL-13 binding molecule) includes at leastlone, two and preferably three CDRs from the light or heavy chain variable domain of an antibody disclosed herein, e.g., MJ 2-7. For example, the protein includes one or more of the following sequences within a CDR region: GFN1KDTYIH (SEQ ID N0:15), RIDPANDNKYDPKFQG (SEQ ED NO: 16), SEENWYDFFDY (SEQ ID NO: 17), RSSQSIVHSNGNTYLE (SEQ IDNO:18), KVSNRFS(SEQIDNO:19), and FQGSHIPYT (SEQ ID N0:20), or a CDR having an amino acid sequence that differs by no more than 4, 3,2.5,2,1.5,1, or 0.5 alterations (e.g,, substitutions, insertions or deletions) for every 10 amino acids (e.g., the number of differences being proportional to the CDR length) relative to a sequence listed above, e.g,, at least one alteration but not more than two, three, or four per CDR. t [0020] For example, the IL-13 binding agent can include, in the light chain variable domain sequence, at least one, two, or three of the following sequences within a CDR region: RSSQSIVHSNGNTYLE (SEQ ID NO: 18), ^—^sr KVSNRFS (SEQ ED NO: 19), and FQGSHIPYT (SEQ ID NO:20), or an amino acid sequence that differs by no more than 4,3,2.5,2,1.5,1, or 0.5 substitutions, insertions or deletions for every 10 amino acids relative to a sequence listed above. [0021] The IL-13 binding agent can include, in the heavy chain variable domain sequence, at least one, two, or three of the following sequences within a CDR region: GFNIKDTYIH (SEQ ID NO:15), RIDPANDNIKYDPKFQG (SEQ ED N0:16), and SEENWYDFFDY (SEQ ID NO: 17), or an amino acid sequence that differs by no more than 4,3,2.5,2,1.5,1, or 0.5 substitutions, insertions or deletions for every 10 amino acids relative to a sequence listed above. The heavy chain CDR3 region can be less than 13 or less than 12 amino acids in length, e.g., 11 amino acids in length (either using Chothia or Kabat definitions). [0022] In another example, the IL-13 binding agent can include, in the light chain variable domain sequence, at least one, two, or three of the following sequences within a CDR region (aniino acids in parentheses represent alternatives for a particular position): (i) (RK)-S-S-Q-S-(LI)-(KV)-H-S-(ND)-G-N-(TN)-Y-L-(EDNQYAS) (SEQ ID N0:25) or (RK)-S-S-Q-S-(LI)-(KV)-H-S-(ND)-G-N-(TN)-Y-L-E (SEQ ID NO:26), or (RK)-S-S-Q-S-(LI)-(KV)-H-S-N-G-N-T-Y-L-(EDNQYAS) (SEQ ID NO:21), (ii) K-(LVI)-S-(NY)-(RW)-(FD)-S (SEQ ID N0:27), or K-(LV)-S-(NY)-R-F-S (SEQIDNO:22),and (iii) Q-(GSA)-(ST)-(HEQ)-I-P (SEQ ID N0:28), F-Q-(GSA)-(SIT)-(HEQ)-(IL)-P (SEQ ID NO:23), or Q-(GSA)-(ST)-(HEQ)-I-P-Y-T (SEQ ED NO: 193), or F-Q-(GSA)-(SIT)-(HEQ)-(IL)-P-Y-T (SEQ ID NO:29). [0023] In one preferred embodiment, the IL-13 binding agent includes all six CDR''''s from MJ 2-7 or closely related CDRs, e.g., CDRs which are identical or which have at least one amino acid alteration, but not more than two, three or four alterations (e.g., substitutions, deletions, or insertions). The EL-13 binding agent can include at least two, three, four, five, six, or seven EL-13 contacting amino acid residues of MJ 2-7 ~-^K: [0024] In still another example, the EL-13 binding agent includes at least one, two, or three CDR regions that have the same canonical structures and the corresponding CDR regions of MJ 2-7, e.g., at least CDR1 and CDR2 of the heavy and/or light chain variable domains of MJ 2-7. [0025] The EL-13 binding agent can include one of the following sequences: • DIVMTQTPLSLPVTPGEPASISCRSSQSIVHSNGNTYLEWYLQKPGQS PQLLIYKVSNRFSGVPDRFSGSGSGTDFTLKISRVEAEDVGVYYC FQGSHIPYT (SEQ ID NO:30) • DWMTQSPLSLPVTLGQPASISCRSSQSIVHSNGNTYLEWFQQRPGQS PRRLIYKVSNRFSGVPDRFSGSGSGTDFTLKISRVEAEDVGVYYC FQGSHIPYT (SEQ ID NO:31) • DIVMTQTPLSLSVTPGQPASISCRSSQSIVHSNGNTYLEWYLQKPGQS PQLLIYKVSNRFSGVPDRFSGSGSGTDFTLKISRVEAEDVGVYYC FQGSHIPYT (SEQ ID NO:32) • DIVMTQTPLSLSVTPGQPASISCRSSQSIVHSNGNTYLEWYLQKPGQP PQLLIYKVSNRFSGVPDRFSGSGSGTDFTLKISRVEAEDVGVYYC FQGSHIPYT (SEQ ID NO:33) • DIVMTQSPLSLPVTPGEPASISCRSSQSIVHSNGNTYLBWYLQKPGQS PQLLIYKVSNRFSGVPDRFSGSGSGTDPTLKISRVEAEDVGVYYC FQGSHIPYT (SEQ ID NO:34) • DIVMTQTPLSSPVTLGQPASISCRSSQSIVHSNGNTYLEWLQQRPGQP PRLLIYKVSNRFSGVPDRFSGSGAGTDFTLKISRVEAEDVGVYYC FQGSHIPYT (SEQ ID NO:35) • DIQMTQSPSSLSASVGDRVTITCRSSQSIVHSNGNTYLEWYQQKPGKA PKLLIYKVSNRFSGVPSRFSGSGSGTDFTLTISSLQPEDFATYYC FQGSHIPYT (SEQ ID NO:36) • DWMTQSPLSLPVTLGQPASISCRSSQSLVY.SDGNTYLNWFQQRPGQS PRRLIYKVSNRFSGVPDRFSGSGSGTDFTLKISRVEAEDVGVYYC FQGSHIPYT (SEQ ID N0:37) • DVLMTQTPLSLPVSLGDQASISCRSSQSIVHSNGNTYLEWYLQKPGQS PKHjIYKVSNRFSGVPDRFSGSGSGTDFTLKISRVEAEDLGVYYC FQGSHIPYT (SEQ ID NO:38) or a sequence that has fewer than eight, seven, six, five, four, three, or two alterations (e.g., substitutions, insertions or deletions, e.g., conservative substitutions or a substitution for an amino acid residue at a corresponding position in MJ 2-7). Exemplary substitutions are at one of the following Kabat positions: 2,4,6,35, 36, 38, 44,47,49,62,64-69, 85,87,98,99,101, and 102. The substitutions can, for example, substitute an amino acid at a corresponding position from MJ 2-7 into a human framework region. [0026] The IL-13 binding agent may also include one of the following sequences: • DIVMTQTPLSLPVTPGEPASISC-(RK)-S-S-Q-S-(LI)-(KV)- H-S-(ND)-G-N-(TN)-Y-L-(EDNQYAS)WYLQKPGQSPQLLIYK- (LVI) -S- (NY) - (RW) - (FD) -SGVPDRFSGSGSGTDFTLKISRVEAEDVGVYYC F-Q-(GSA)- (SIT)-(HEQ)- (IL)-P (SEQ ID NO:39) • DWMTQSPLSLPVTLGQPASISC- (RK) -S-S-Q-S- (LI) - (KV) - H-S- (ND)-G-N-(TN)-Y-L-(EDNQYAS)WFQQRPGQSPRRLIYK- (LVI) -S- (NY) - (RW) - (FD) - SGVPDRFSGSGSGTDFTLKISRVEAEDVGVYYCF-Q- (GSA) -(SIT)-(HEQ)-(IL)-P (SEQ ID NO:40) • DIVMTQTPLSLSVTPGQPASISC- (RK) -S-S-Q-S- (LI) - (KV) - H-S- (ND) -G-N- (TN) -Y-L- (EDNQYAS)WYLQKPGQSPQLLIYK- (LVI)-S-(NY)-(RW)-(FD)- SGVPDRFSGSGSGTDFTLKISRVEAEDVGVYYCF-Q- (GSA) -(SIT)-(HEQ)-(IL)-P (SEQ ID NO:41) • DIVMTQTPLSLSVTPGQPASISC (RK) -S-S-Q-S- (LI) - (KV) -H- S- (ND) -G-N- (TN) -Y-L- (EDNQYAS)WYLQKPGQPPQLLIYK- (LVI)-S-(NY) - (RW) - (FD)- SGVPDRFSGSGSGTDFTLKISRVEAEDVGVYYCF-Q- (GSA) -(SIT)-(HEQ)-(IL)-P (SEQ ID N0:42) • DIVMTQSPLSLPVTPGEPASISC (RK) -S-S-Q-S- (LI) - (KV) -H- S''''^TND) -G-N- (TN) -Y-L- (EDNQYAS) WYLQKPGQSPQLLIYK- (LVI)-S-(NY) - (RW) - (FD)- SGVPDRFSGSGSGTDFTLKISRVEAEDVGVYYCF-Q- (GSA) -(SIT)-(HEQ)-(IL)-P (SEQ ID N0:43) • DIVMTQTPLSSPVTLGQPASISC (RK) -S-S-Q-S- (LI) - (KV) -H- S- (ND) -G-N- (TN) -Y-L- (EDNQYAS) WLQQRPGQPPRLLIYK- (LVI)-S-(NY)-(RW)-(FD)- SGVPDRFSGSGAGTDFTLKISRVEAEDVGVYYCF-Q- (GSA) -(SIT)-(HEQ)-(IL)-P (SEQ ID NO:44) • DIQMTQSPSSLSASVGDRVTITC (RK) -S-S-Q-S- (LI) - (KV) -H- S- (ND) -G-N- (TN) -Y-L- (EDNQYAS) WYQQKPGKAPKLLIYK- (LVI) -S- (NY) - (RW) - (FD) - SGVPSRFSGSGSGTDFTLTISSLQPEDFATYYCF-Q- (GSA) -(SIT)-(HEQ)-(IL)-P (SEQ ID N0:45) • DVLMTQTPLSLPVSLGDQASISC(RK) -S-S-Q-S- (LI) - (KV) -H- S- (ND) -G-N- (TN) -Y-L- (EDNQYAS) WYLQKPGQSPKLLIYK- (LVI)-S-(NY)-(RW)-(FD)- SGVPDRFSGSGSGTDFTLKISRVEAEDLGVYYCF-Q- (GSA) - (SIT)-(HEQMIL)~P (SliQ IU N0;4o) or a sequence that has fewer than eight, seven, six, five, four, three, or two alterations (e.g., substitutions, insertions or deletions, e.g., conservative substitutions or a substitution for an amino acid residue at a corresponding position in MJ 2-7) in the framework region. Exemplary substitutions are at one or rnote of the following Kabat positions: 2,4,6,35,36,38,44,47,49,62, 64-69, 85, 87,98, 99, 101. and 102. The substitutions can, for example, substitute an amino acid at a corresponding position from MJ 2-7 into a human framework region. The sequences may also be followed by the dipeptide Tyr-Thr. The FR4 region can include, e.g., the sequence FGGGTKVEKR (SEQ ID NO.47). [0027] In another example, the IL-13 binding agent can include, in the heavy chain variable domain sequence, at least one, two, or three of the following sequences within a CDR region (amino acids in parentheses represent alternatives for a particular position): (0 G-(YF)-(NT>I-K-D-T-Y-(MI)-H (SEQ.ID N0:48), (ii) (WR)--H5-P-(GA)-N-D-N-I-K-Y-(SD)-CPQ)-K-F-Q-G (SEQ ID NO:49), and (iii) SEENWYDFFDY (SEQ ID NO: 17). [0028] The IL-13 binding agent can include one of the following sequences: » QVQLVQSGAEVKKPGASVKVSCKASGFNIKDTYIHWVRQAPGQGLEWM GRIDPANDNIKXDPKFQGRVTMTRDTSISTAYMELSRLRSDDTAVYYC ARSEENWYDFFDY ''''(SEQ ID NO:50) • QVQLVQSGAEVKKPGASVKVSCKASGFNI KDTYIHWVRQAPGQRLEWM GR1DPANDNIKYDPKFQGRVTITRDTSASTAYMELSSLRSEDTAVYYC ARSEENWYDFFDY (SEQ ID NO;51) • QVQLVQSGAEVKKPGASVKVSCKASGFNIKDTYIHWVRQATGQGLEWM GRIDPANDNIKYDPKFQGRVTMTRNTSISTAYMELSSLRSEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:52) • QVQLVQSGAEVKKPGASVKVSGKASGFNIKDTYIKWVRQAPGQGLEVJM GRIDPANDNIKYDPKFQGRVTMTTDTSTSTAYMELRSLRSDDTAVYYC ''''ARSEENWYDFFDY {SEQ ID NO:53) QVQLVQSGAEVKKPGASVKVSCKVSGFNIKDTYIHWVRQAPGKGLEWM GRIDPANDNIKYDPKFQGRVTMTEDTSTDTAYMELSSLRSEDTAVYYC ATSEENWYDFFDY (SEQ ID NO:54) QMQLVQSGAEVKKTGSSVKVSCKASGFNIKDTYIHWVRQAPGQALEWM GRIDPANDNIKYDPKFQGRVTITRDRSMSTAYMELSSLRSEDTAMYYC ARSEENWYDFFDY (SEQ ID NO:55) QVQLVQSGAEVKKPGASVKVSCKASGFNIKDTYIHWVRQAPGQGLEWM GRIDPANDNIKYDPKFQGRVTMTRDTSTSTVYMELSSLRSEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:56) QMQLVQSGPEVKKPGTSVKVSCKASGFNIKDTYIHWVRQARGQRLEWI GRIDPANDNIKYDPKFQGRVTITRDMSTSTAYMELSSLRSEDTAVYYC AASEENWYDFFDY (SEQ ID NO:57) EVQLVESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWV ARIDPANDNIKYDPKFQGRFTISRDNAKNSLYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:58) EVQLVESGGGLVQPGRSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWV SR^DPANDNI KYDPKFQGRFTISRDNAKNSLYLQMNSLRAEDTALYYC AKDSEENWYDFFDY (SEQ ID NO:59) QVQLVESGGGLVKPGGSLRLSCAASGFNIKDTYIHWIRQAPGKGLEWV SRIDPANDNIKYDPKFQGRFTISRDNAKNSLYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:60) EVQLVESGGGLVKPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWV GRIDPANDNIKYDPKFQGRFTISRDDSKNTLYLQMNSLKTEDTAVYYC TTSEENWYDFFDY (SEQ ID NO:61) EVQLVESGGGWRPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEVTV SRIDPANDNIKYDPKFQGRFTISRDNAKNSLYLQMNSLRAEDTALYHC ARSEENWYDFFDY (SEQ ID NO:62) EVQLVESGGGLVKPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWV SRIDPANDNIKYDP3CFQGRFTISRDNAKNSLYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:63) EVQLLESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWV SRIDPANDNIKYDPKFQGRFTISRDNSKNTLYLQMNSLRAEDTAVYYC AKSEENWYDFFDY (SEQ ID NO:64) • QVQLVESGGGVVQPGRSLRLSCAASGFNIKDTYIHIWVRQAPGKGLEWV ARIDPANDNIKYDPKFQGRFTISRDNSKNTLYLQMNSLRAEDTAVYYC AKSEENWYDFFDY (SEQ ID NO:65) • QVQLVESGGGWQPGRSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWV ARIDPANDNIKYDPKFQGRFTISRDNSKNTLYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:66) • EVQLVESGGVWQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWV SRIDPANDNIKYDPKFQGRFTISRDNSKNSLYLQMNSLRTEDTALYYC AKDSEENWYDFFDY (SEQ ID NO:67) • EVQLVESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWV SRIDPANDNIKYDPKFQGRFTISRDNAKNSLYLQMNSLRDEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:68) • EVQLVESGGGLVQPGRSLRLSCTASGFNIKDTYIHWFRQAPGKGLEWV GRIDPANDNIKYDPKFQGRFTISRDGSKSIAYLQMNSLKTEDTAVYYC TRSEENWYDFFDY (SEQ ID NO:69) • EVQLVESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEYV SRI&PANDNIKYDPKFQGRFTISRDNSKNTLYLQMGSLRAEDMAVYYC ARSEENWYDFFDY (SEQ ID NO:70) • EVQLVESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWI GRIDPANDNIKYDPKFQGRFTISRDNAKNSLYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID N0:71) • EVQLVESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWV ARIDPANDNIKYDPKFQGKATISRDNAKNSLYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:72) • EVQLVESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWV ARIDPANDNIKYDPKFQGRFTISADNAKNSLYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:73) • EVQLVESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWV GRIDPANDNIKYDPKFQGRFTISRDNAKNSLYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:74) • EVQLVESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWV ARIDPANDNIKYDPKFQGKATISADNAKNSLYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:75) • EVQLVESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWI GRIDPANDNIKYDPKFQGRFTISADNAKNSLYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:76) • EVQLVESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWV GRIDPANDNIKYDPKFQGRFTISADNAKNSLYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:77) • • EVQLVESGGGLVQPGGSLRLSCAASGFNI KDTYIHWVRQAPGKGLEWV ARIDPANDNIKYDPKFQGRFTISRDNAKNSAYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:78) » EVQLVESGGGLVQPGGSLRLSCAASGFNI KDTYIHWVRQAPGKGLEWV GRIDPANDNIKYDPKFQGRFTISADNAKNSAYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:79) • EVQLVESGGGLVQPGGSLRLSCAASGFNI KDTYIHWVRQAPGKGLEWI GRIDPANDNIKYDPKFQGRFTISADNAKNSAYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:80) • EVQLVESGGGLVQPGGSLRLSCTGSGFNIKDTYIHWVRQAPGKGLEWI GRICPANDNIKYDPKFQGRFTISADNAKNSLYLQMNSLRAEDTAVYYC ARSEENWYDFFDY (SEQ ID NO:81) • EVQLQQSGAELVKPGASVKLSCTGSGFNIKDTYIHWVKQRPEQGLEWI GRIDPANDNIKYDPKFQGKATITADTSSNTAYLQLNSLTSEDTAVYYC ARSEENWYDFFDY (SEQ ID NO-.82) or a sequence that has fewer than eight, seven, six, five, four, three, or two alterations (e.g., substitutions, insertions or deletions, e.g., conservative substitutions or a substitution for an amino acid residue at a corresponding position in MJ 2-7). Exemplary substitutions are at one or more of the following Kabat positions: 2, 4,6,25, 36,37,39,47,48,93,94,103,104,106, and 107. Exemplary substitutions can also be at one or more of the following positions (accordingly to sequential numbering): 48,49, 67,68,72, and 79. The substitutions can, for example, substitute an amino acid at a corresponding position Scorn MJ 2-7 into a human framework region. In one embodiment, the sequence includes (accordingly to sequential numbering) one or more of the following: He at 48, Gly at 49, Lys at 67, Ala at 68, Ala at 72, and Ala at 79; preferably, e.g., He at 48, Gly at 49, Ala at 72, and Ala at 79. r0029] Further, the frameworks of the heavy chain variable domain sequence "can include: (i) at a position corresponding to 49, Gly; (ii) at a position corresponding to 72, Ala; (iii) at positions corresponding to 48, He, and to 49, Gly; (iv) at positions corresponding to 48, He, to 49, Gly, and to 72, Ala; (y) at positions corresponding to f67, Lys, to 68, Ala, and to 72, Ala; and/or (vi) at positions corresponding to 48, He, to 49, Gly, to 72, Ala, to 79, Ala. [0030] The IL-13 binding agent may also include one of the following sequences: • QVQLVQSGAEVKKPGASVKVSCKASG- (YF) - (NT) -I-K-D-T-Y- (MI) -H,WVRQAPGQGLEWMG(WR) -I-D-P- (GA)-N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q- GRVTMTRDTSISTAYMELSRLRSDDTAVYYCAR SEENWYDFFDY (SEQ ID NO:83) " QVQLVQSGAEVKKPGASVKVSCKASG- (YF) - (NT) -I-K-D-T-Y-(MI) -H,WVRQAPGQRLEWMG(WR) -I-D-P- (GA) -N-D-N-I-K-Y-iSP)-(PQ)-K-F-Q- GRVTITRDTSASTAYMELSSLRSEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:84) • QVQLVQSGAEVKKPGASVKVSCKASG- (YF) - (NT) -I-K-D-T-Y- (MI) -H,WVRQATGQGLEWMG(WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q-GRVTMTRNTSISTAYMELSSLRSEDTAVYYCAR SEENWYDFFDY (SEQ ID N0:85) • QVQLVQSGAEVKKPGASVKVSCKASG- (YF) - (NT) -I-K-D-T-Y- (MI) -H,WVRQAPGQGLEWMG(WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q-GRVTMTTDTSTSTAYMELRSLRSDDTAVYYCAR SEENWYDFFDY (SEQ ID N0:86) • QVQLVQSGAEVKKPGASVKVSCKVSG- (YF) - (NT) -I-K-D-T-Y- (MI) -H,WVRQAPGKGLEWMG(WR)-I-D-P-(GA)-N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q- GRVTMTEDTSTDTAYMELSSLRSEDTAVYYCAT SEENWYDFFDY (SEQ ID NO:87) • QMQLVQSGAEVKKTGSSVKVSCKASG-(YF)-(NT)-I-K-D-T-Y- (MI)-H,WVRQAPGQALEWMG(WR)-I-D-P-(GA)-N-D-N-I-K- Y-(SD)~(PQ)-K-F-Q- GRVTITRDRSMSTAYMELSSLRSEDTAMYYCAR SEENWYDFFDY (SEQ ID NO:88) • QVQLVQSGAEVKKPGASVKVSCKASG-(YF)-(NT)-I-K-D-T-Y- (MI)-H,WVRQAPGQGLEWMG(WR)-I-D-P-(GA)-N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q-GRVTMTRDTSTSTVYMELSSLRSEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:89) • QMQLVQSGPEVKKPGTSVKVSCKASG- (YF)''''- (NT) -I-K-D-T-Y- (MI)-H,WVRQARGQRLEWIG(WR)-I-D-P-(GA)-N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q-GRVTITRDMSTSTAYMELSSLRSEDTAVYYCAA SEENWYDFFDY TStfQ ID NO:90) • EVQLVESGGGLVQPGGSLRLSCAASG-(YF)-(NT)-I-K-D-T-Y- (MI)-H,WVRQAPGKGLEWVA(WR)-I-D-P-(GA)-N-D-N-I-K-''''Y- (SD) - (PQ) -K-F-Q-GRFTISRDNAKNSLYLQMNSLRAEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:91) • EVQLVESGGGLVQPGRSLRLSCAASG-(YF)-(NT)-I-K-D-T-Y- (MI)-H,WVRQAPGKGLEWVS(WR)-I-D-P-(GA)-N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q-GRFTISRDNAKNSLYLQMNSLRAEDTALYYCAK DSEENWYDFFDY (SEQ ID NO:92) " QVQLVESGGGLVKPGGSLRLSCAASG-(YF)-(NT)-I-K-D-T-Y- (MI)-H,WIRQAPGKGLEWVS(WR)-I-D-P-(GA)-N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q-GRFTISRDNAKNSLYLQMNSLRAEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:93) • EVQLVESGGGLVKPGGSLRLSCAASG-(YF)-(NT)-I-K-D-T-Y- (MI)-H,WVRQAPGKGLEWVG(WR)-I-D-P-(GA)-N-D-N-I-K-Y-(SD)-(PQ)-K~F-Q-GRFTISRDDSKNTLYLQMNSLKTEDTAVYYCTT SEENWYDFFDY (SEQ ID NO:94) • EVQLVESGGGWRPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y- (MI) -H,WVRQAPGKGLEWVS (WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q- GRFTISRDNAKNSLYLQMNSLRAEDTALYHCAR SEENWYDFFDY (SEQ ID NO:95) « EVQLVESGGGLVKPGGSLRLSCAASG- (YF) - (NT) -I -K-D-T-Y-(MI) -H,WVRQAPGKGLEWVS (WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q- GRFTISRDNAKNSLYLQMNSLRAEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:96) » EVQLLESGGGLVQPGGSLRLSCAASG- (YF) - (NT) -1 -K-D-T-Y-(M-I^rH,WVRQAPGKGLEWVS (WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q- GRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAK SEENWYDFFDY. (SEQ ID NO:97) » QVQLVESGGGWQPGRSLRLSCAASG- (YF) - (NT) -1 -K-D-T-Y-(MI) -K,WVRQAPGKGLEWVA(WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q- GRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAK SEENWYDFFDY (SEQ ID NO:98) « QVQLVESGGGWQPGRSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y-(MI) -H,WVRQAPGKGLEWVA(WR) -I-D-P- (GA) -N-D-N-I-K-Y- (SD) - (PQ> -K-F-Q- GRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:99) • EVQLVESGGVWQPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y-(MI)-H,WVRQAPGKGLEWVS(WR)-I-D-P-(GA)-N-D-N-I-K-Y-{SD)-(PQ)-K-F-Q- GRFTISRDNSKNSLYLQMNSLRTEDTALYYCAK DSEENWYDFFDY (SEQ ID N0:100) • EVQLVESGGGLVQPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y- (MI)-H,WVRQAPGKGLEWVS(WR) -I-D-B-(GA) -N-D-N-I-K- Y-(SD)-(PQ)-K-F-Q- r GRFTISRDNAKNSLYLQMNSLRDEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:101) • EVQLVESGGGLVQPGRSLRLSCTASG- (YF) - (NT) -I-K-D-T-Y- (MX) -H,WFRQAPGKGLEWVG(WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q-GRFTISRDGSKSIAYLQMNSLKTEDTAVYYCTR SEENWYDFFDY (SEQ ID NO:102) • EVQLVESGGGLVQPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y- (MI) -H.WVRQAPGKGLEYVS (WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q-GRFTISRDNSKNTLYLQMGSLRAEDMAVYYCAR SEENWYDFFDY (SEQ ID N0:103) —-»r • EVQLVESGGGLVQPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y- (MI) -H.WVRQAPGKGLEWIG(WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q- GRFTISRDNAKNSLYLQMNSLRAEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:104) • EVQLVESGGGLVQPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y- (MI) -H,WVRQAPGKGLEWVA(WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q-GKATISRDNAKNSLYLQMNSLRAEDTAVYYCAR SEENWYDFFDY {SEQ ID N0:105) • EVQLVESGGGLVQPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y- (MI)-H,WVRQAPGKGLEWVA(WR)-I-D-P-(GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q- GRFTISADNAKNSLYLQMNSLRAEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:106) • EVQLVESGGGLVQPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y- (MI)-H,WVRQAPGKGLEWVG(WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q- GRFTISRDNAKNSLYLQMNSLRAEDTAVYYCAR SEENWYDFFDY (SEQ ID N0:107) • EVQLVESGGGLVQPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y- (MI)-H,WVRQAPGKGLEWVA(WR) -I-D-P- (GA) -N-D-N-I-K- Y-(SD)-(PQ)-K-F-Q- GKATISADNAKNSLYLQMNSLRAEDTAVYYCAR SEENWYDFFDY {SEQ ID N0:108) • EVQLVESGGGLVQPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y- (MI) -H,WVRQAPGKGLEWIG(WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q- GRFTISADNAKNSLYLQMNSLRAEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:109) • EVQLVESGGGLVQPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y- J[MIJ -H,WVRQAPGKGLEWVG(WR) -I-D-P- (GA) -N-D-N-I-K- Y-(SD)-(PQ)-K-F-Q- GRFTISADNAKNSLYLQMNSLRAEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:110) • EVQLVESGGGLVQPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y- (MI) -H,WVRQAPGKGLEWVA(WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q-GRFTISRDNAKNSAYLQMNSLRAEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:111) • EVQLVESGGGLVQPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y- (MI)-H,WVRQAPGKGLEWVG(WR)-I-D-P-(GA)-N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q-GRFTISADNAKNSAYLQMNSLRAEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:112) • EVQLVESGGGLVQPGGSLRLSCAASG- (YF) - (NT) -I-K-D-T-Y- (MI) -H, WVRQAPGKGLEWIG(WR) -I-D-P- (GA) -N-D-N-I-K- Y-(SD)-(PQ)-K-F-Q- GRFTISADNAKNSAYLQMNSLRAEDTAVYYCAR SEENWYDPFDY {SEQ ID NO:113) • EVQLVESGGGLVQPGGSLRLSCTGSG- (YF) - (NT) -I-K-D-T-Y- (MI)-H,WVRQAPGKGLEWIG(WR) -I-D-P- (GA) -N-D-N-I-K-Y-(SD)-{PQ)-K-F-Q-GRFTISADNAKNSLYLQMNSLRAEDTAVYYCAR 9EENWYDFFDY (SEQ ID N0:114) • EVQLQQSGAELVKPGASVKLSCTGSG- (YF) - (NT) -I-K-D-T-Y- {MI} -H,WVKQRPEQGLEWIG{WR) -I-D-P- (GA) -N-D-N-I-K- Y-(SD)-(PQ)-K-F-Q- GKATITADTSSNTAYLQLNSLTSEDTAVYYCAR SEENWYDFFDY (SEQ ID NO:115) or a sequence that has fewer than eight, seven, six, five, four, three, or two alterations (e.g., substitutions, insertions or deletions, e.g., conservative substitutions or a substitution, for an. amino acid residue at a corresponding position in MJ 2-7) in the framework region. Exemplary substitutions are at one or more of the following Kabat positions: 2,4,6,^36,37,39,47,48,93,94,103,104,106, and 107. The substitutions can, for example, substitute an amino acid at a corresponding position from MJ 2-7 into a human framework region. The FR4 region can include, e.g., the sequence WGQGTTLTVSS (SEQ ID NO: 116) or WGQGTLVTVSS (SEQ ID NO: 117). [0031] In one embodiment, the heavy chain variable domain sequence is at least 90,92,93,94,95,96,97,98,99% identical or identical to the heavy chain variable domain of V2.1, V2.2, V2.3, V2.4, V2.5, V2.6, V2.7, V2.ll, or other heavy chain variable domain described herein. In one embodiment, the heavy chain variable domain sequence includes variable domain sequence comprises a sequence encoded by a nucleic acid that hybridizes under high stringency conditions to the complement of a nucleic acid encoding the heavy chain variable domain of V2.1, V2.2, V2.3, V2.4, V2.5, V2.6, V2.7, V2.11, or other heavy chain variable domain described herein. In one embodiment, the light chain variable domain sequence is at least 90, 92,93,94, 95, 96, 97,98,99% identical or identical to the light chain variable domain of V2.11 or other light chain variable domain described herein. In one embodiment, the light chain variable domain sequence comprises a sequence encoded by a nucleic acid that hybridizes under high stringency conditions to the complement of a nucleic iicid encoding the light chain variable domain of V2.11 or other light chain variable domain described herein. [0032] In one embodiment, the heavy chain framework (e.g., FR1, FR2, FR3, individually, or a sequence encompassing FR1, FR2, and FR3, but excluding CDRs) includes an araino acid sequence, which is at least 80%, 85%, 90%, 95%, 97%, 98%, 99% or higher identical to the heavy chain framework of one of the following germline V segment sequences: DP-25, DP-1, DP-12, D?-9, DP-7, DP-31, DP-32, DP-33, DP-58, or DP-54, or another V gene which is compatible with the canonical structure class 1-3 (see, e.g., Chothiaet al. (1992) J. Mol Bio/. 227:799-817; Tomlinson et al. (1992) J. Mol. Biol. 227:776-798). Other frameworks compatible with the canonical structure * class 1-3 include frameworks with the one or more of the following residues according to Kabat numbering: Ala, Gly, Thr, or Val at position 26; Gly at position 26; Tyr, Phe, or Gly at position 27; Phe, Val, He, or Leu at position 29; Met, He, Leu, Val, Thr, Trp, or Be at position 34; Arg, Thr, Ala, Lys at position 94; Gly, Ser, Asn, or Asp at position 54; and Arg at position 71. [0033] In one embodiment, the light chain framework (e.g., FR1, FR2, FR3, individually, or a sequence encompassing FR1, FR2, and FR3, but excluding CDRs) includes an amino acid sequence, which is at least 80%, 85%, 90%, 95%, 97%, 98%, 99% or higher identical to the light chain framework of a VK. II subgroup germline sequence or one of the following germline V segment sequences: A17, Al, A18, A2, A19/A3, or A23 or another V gene which is compatible with the canonical structure class 4-1 (see, e.g., Tomlinson et al. (1995) EMBOJ. 14:4628). Other frameworks compatible with the canonical structure class 4-1 include frameworks with the one or more of the following residues according to Kabat numbering: Val or Leu or He at position 2; Ser or Pro at position 25; He or Leu at position 29; Gly at position 3 Id; Phe or Leu at position 33; and Phe at position 71. [0034] In another embodiment, the light chain framework (e.g., FR1, FR2, FR3, individually, or a sequence encompassing FR1, FR2, and FR3, but excluding CDRs) includes an amino acid sequence, which is at least 80%, 85%, 90%, 95%, 97%, 98%, 99% or higher identical to the light chain framework of a VK I subgroup germline sequence, e.g., a DPK9 sequence. [0035] In another embodiment, the heavy chain framework (e.g., FR1, FR2, FR3, individually, or a sequence encompassing FR1, FR2, and FR3, but excluding CDRs) includes an amino acid sequence, which is at least 80%, 85%, 90%, 95%, 97%, 98%, 99% or higher identical to the light chain framework of a VHI subgroup germline sequence, e.g., a DP-25 sequence or a VH HI subgroup germline sequence, e.g., a DP-54 sequence. [0036] In one embodiment, the IL-13 binding agent includes at least one, two and preferably three CDR''''s from the light or heavy chain variable domain of an antibody disclosed herein, e.g., C65. For example, the IL-13 binding agent includes one or more of the following sequences within a CDR region: QASQGTSINLN (SEQ ID NO: 118), GASNLED (SEQ ID NO:119), and LQHSYLPWT (SEQ ID NO: 120) GFSLTGYGVN (SEQ ID NO:121), HWGDGSTDYNSAL (SEQ ID NO: 122), and DKTFYYDGFYRGRMDY (SEQ ID NO: 123), or a CDR having an amino acid sequence that differs by no more than 4,3, 2.5,2, 1.5,1, or 0.5 substitutions, insertions or deletions for every 10 amino acids (e.g., the number of differences being proportional to the CDR length) relative to a sequence listed above, e.g., at least one alteration but not more than two, three, or four per CDR. For example, the protein can include, in the light chain variable domain sequence, at least one, two, or three of the following sequences within a CDR region: QASQGTSINLN (SEQ ID NO: 118), GASNLED (SEQ ID N0:l 19), and LQHSYLPWT (SEQ ID NO: 120), or an amino acid sequence that differs by no more than 4, 3,2.5,2,1.5,1, or 0.5 substitutions, insertions or deletions for every 10 amino acids relative to a sequence listed above. [0037] The IL-13 binding agent can include, in the heavy chain variable domain sequence, at least one, two, or three of the following sequences within a CDR region: GFSLTGYGVN (SEQ ID NO:121), IIWGDGSTDYNSAL (SEQ ED NO: 122), and DKTFYYDGFYRGRMDY (SEQ ID NO: 123), or an amino acid sequence that differs by no more than 4,3,2.5,2, 1.5, 1, or 0.5 substitutions, insertions or deletions for every 10 amino acids relative to a sequence listed above. [0038] In one preferred embodiment, the IL-13 binding agent includes all six CDRs from C65 or closely related CDRs, e.g., CDRs which are identical or which have at least one amino acid alteration, but not more than two, three or four alterations (e.g., substitutions, deletions, or insertions). [0039] In still another embodiment, the EL-13 binding agent includes at least one, two or three CDR regions that have the same canonical structures and the corresponding CDR regions of C65, e.g., at least CDR1 and CDR2 of the heavy and/or light chain variable domains of C65. [0040] In one embodiment, the heavy chain framework (e.g., FR1, FR2, FR3, —:*r individually, or a sequence encompassing FR1, FR2, and FR3, but excluding CDRs) includes an amino acid sequence, which is at least 80%, 85%, 90%, 95%, 97%, 98%, 99% or higher identical to the heavy chain framework of one of the following germline V segment sequences: DP-71 or DP-67 or another V gene which is compatible with the canonical structure class of C65 (see, e.g., Chothia et al. (1992)/. Mol. Biol. 227:799-817; Tomlinson et al. (1992) /. Mol. Biol. 227:776-798). [0041] In one embodiment, the light chain framework (e.g., FR1, FR2, FR3, individually, or a sequence encompassing FR1, FR2, and FR3, but excluding CDRs) includes an amino acid sequence, which is at least 80%, 85%, 90%, 95%, 97%, 98%, 99% or higher identical to the light chain framework of DPK-1 or DPK-9 germline sequence or another V gene which is compatible with the canonical structure class of C65 (see, e.g., Tomlinson et al. (1995) EMBOJ. 14:4628). [0042] In another embodiment, the light chain framework (e.g., FR1, FR2, FR3, individually, or a sequence encompassing FR1, FR2, and FR3, but excluding CDRs) includes an amino acid sequence, which is at least 80%, 85%, 90%, 95%, 97%, 98%, 99% or higher identical to the light chain framework of a VK I subgroup germline sequence, e.g., a DPK-9 or DPK-1 sequence. [0043] In another embodiment, the heavy chain framework (e.g., FR1, FR2, FR3, individually, or a sequence encompassing FR1, FR2, and FR3, but excluding CDRs) includes an amino acid sequence, which is at least 80%, 85%, 90%, 95%, 97%, 98%, 99% or higher identical to the light chain framework of a VHIV subgroup germline sequence, e.g., aDP-71 orDP-67 sequence. [0044] In one embodiment, the light or the heavy chain variable framework (e.g., the region encompassing at least FR1, FR2, FR3, and optionally FR4) can be chosen from: (a) a light or heavy chain variable framework including at least 80%, 85%, 90%, 95%, or 100% of the amino acid residues from a human light or heavy chain variable framework, e.g., a light or heavy chain variable framework residue from a human mature antibody, a human germline sequence, a human consensus sequence, or a human antibody described herein; (b) a light or heavy chain variable framework including from 20% to 80%, 40% to 60%, 60% to 90%, or 70% to 95% of the amino "•--/> mo---j *•- ~~ arranged from amino-terminus to carboxy-terminus in the following order: FRl, CDR1, FR2, CDR2, FR3, CDR3, FR4. [0079] As used herein, an "immunoglobulin variable domain sequence" refers to an amino acid sequence which can form the structure of an immunoglobulin variable domain. For example, the sequence may include all or part of the amino acid sequence of a naturally-occurring variable domain. For example, the sequence may or may not include one, two, or more N- or C-terminal amino acids, or may include other alterations that are compatible with formation of the protein structure. [0080] The term "antigen-binding site" refers to the part of an IL-13 binding agent that comprises determinants that form an interface that binds to the IL-13, e.g., a mammalian IL-13, e.g-> human or non-human primate IL-13, or an epitope thereof. With respect to proteins (or protein mimetics), the antigen-bin''''ding site typically includes one or more loops (of at least four amino acids or amino acid mimics) that form an interface that binds to IL-13. Typically, the antigen-binding site of an antibody molecule includes at least one or two CDRs, or more typically at least three, four, five or six CBRs. [0081 ] The terms "monoclonal antibody" or "monoclonal antibody composition" as used herein, refer to a preparation of antibody molecules of single molecular composition. A monoclonal antibody composition displays a single binding specificity and affinity for a particular epitope. A monoclonal antibody can be made by hybridoma technology or by methods that do not use hybridoma technology (e.g., recombinant methods). [0082] An "effectively human" protein is a protein that does not evoke a neutralizing antibody response, e.g., the human anti-murine antibody (KAMA) response. HAMA can be problematic in a number of circumstances, e.g., if the antibody molecule is administered repeatedly, e.g., in treatment of a chronic or recurrent disease condition. A HAMA response can make repeated antibody administration potentially ineffective because of an increased antibody clearance from the serum (see, e.g., Saleh et al., CancerImmunol. Immunother., 32:180-190 (1990)) and also because of potential allergic reactions (see, e.g., LoBuglio et al., Hybridoma, 5:5117-5123(1986)). [0083] The term "isolated" refers to a molecule that is substantially free of its natural environment. For instance, an isolated protein is substantially free of cellular material or other proteins from the cell or tissue source from which it is derived. The term refers to preparations where the isolated protein is sufficiently pure to be administered as a therapeutic composition, or at least 70% to 80% (wAv) pure, more preferably, at least 80%-90% (w/w) pure, even more preferably, 90-95% pure; and, most preferably, at least 95%, 96%, 97%, 98%, 99%, or 100% (w/w) pure. A "separated" compound refers to a compound that is removed from at least 90% of at least one component of a sample from which the compound was obtained. Any compound described herein can be provided as an isolated or separated compound. [0084] An "epitope" refers to the site on a target compound that is bound by a binding agent, e.g., an antibody molecule. An epitope can be a linear or conformational epitope, or a combination thereof. In the case where the target compound is a protein, for example, an epitope may refer to the amino acids that are bound by the binding agent. Overlapping epitopes include at least one common amino acid residue. [0085] As''''ilSed herein, the term "hybridizes under low stringency, medium stringency, high stringency, or very high stringency conditions" describes conditions for hybridization and washing. Guidance for performing hybridization reactions can be found in Current Protocols in Molecular Biology, John Wiley & Sons, N.Y. (1989), 6.3.1-6.3.6. Aqueous and nonaqueous methods are described in that reference and either can be used. Specific hybridization conditions referred to herein are as follows: 1) low stringency hybridization conditions in 6X sodium chloride/sodium citrate (SSC) at about 45 °C, followed by two washes in 0.2X SSC, 0.1% SDS at least at 50 °C (the temperature of the washes can be increased to 55°C for low stringency conditions); 2) medium stringency hybridization conditions in 6X SSC at about 45 °C, followed by one or more washes in 0.2X SSC, 0.1 % SDS at 60°C; 3) high stringency hybridization conditions in 6X SSC at about 45 *C, followed by one or more washes in 0.2X SSC, 0.1% SDS at 65 CC; and preferably 4) very high stringency hybridization conditions are 0.5 M sodium phosphate, 7% SDS at 65 °C, followed by one or more washes at 0.2X SSC, 1% SDS at 65 °C. Very high stringency conditions (4) are the preferred conditions and the ones that are used unless otherwise specified. [0086] An "IL-13 associated disorder" is one in which IL-13 contributes to a pathology or symptom of the disorder. Accordingly, an IL-13 binding agent, e.g., an IL-13 binding agent that is an antagonist of one or more IL-13 associated activities, can be used to treat or prevent the disorder. [0087] The term "IL-13" includes the full length unprocessed form of the cytokines known in the art as IL-13 (irrespective of species origin, and including mammalian, e.g., human and non-human primate IL-13) as well as mature, processed forms thereof, as well as any fragment (of at least 5 amino acids) or variant of such cytokines. Positions within the IL-13 sequence can be designated in accordance to the numbering for the full length, unprocessed human IL-13 sequence. For an exemplary full-length monkey IL-13, see SEQ ID N0:24; for mature, processed monkey IL-13, see SEQ ID NO:14; for full-length human IL-13, see SEQ ID N0:178, and for mature, processed human IL-13, see SEQ ID NO:124. An exemplary sequence is recited as follows: MALLLTTVIALTCLGGFASPGPWPSTALRELIEELVNITQNQKAPLCNGSMVW Sr^^TAGMYCXaESLI^rVSGCSAffiKTQRMLSGFCPHKVSAGQFSSLHVRDTK ffiVAQFVKDLLLHLKKLFREGRFN (SEQ DD N0:178) [0088] For example, position 130 is a site of a common polymorphism. [0089] Exemplary sequences of IL-13 receptor proteins (e.g., IL-l3Ral and IL-13Ra2) are described, e.g., in Donaldson et ai (1998) JImmunol. 161:2317-24; U.S. 6,214,559; U.S. 6,248,714; and U.S. 6,268,480. BRIEF DESCRIPTION OF THE DRAWINGS [0090] FIG. 1A is an alignment of full-length human and cynomolgus monkey IL-13, SEQ ID NO:178 and SEQ ID NO: 14, respectively. [0091] FIG. IB is a list of exemplary peptides from cynomolgus monkey IL-13, (SEQ ID NOs:179-188, respectively). [0092] FIG 2 is a graph depicting the neutralization of NHP IL-13 activity by various IL-13 binding agents, as measured by percentage of CD23* monocytes (y-axis). :oncentration of MJ2-7 (A), C65 (*), and s!L-13Ro2-Fc (•) are indicated on the x-uis. 0093] FIG 3 is a graph depicting the neutralization of NHP IL-13 activity by tfJ2-7 (murine; •) or humanized MJ2-7 v2.11 (o). NHP IL-13 activity was measured jy phosphorylation of STAT6 (y-axis) as a function of antibody concentration (x-axis). ''''0094] FIG 4 is a graph depicting the neutralization of NHP IL-13 activity by VIJ2-7 v2.11 (o) or sIL-13Ra2-Fc (A). NHP IL-13 activity was measured by phosphorylation of STAT6 (y-axis) as a function of antagonist concentration (x-axis). [0095] FIG 5 is a graph depicting the neutralization of NHP IL-13 activity by MJ2-7 (A), C65 (*), or sIL-13Ra2-Fc (•). NHP DL-13 activity was measured by phosphorylation of STAT6 (y-axis) as a function of antagonist concentration (x-axis). [0096] FIG 6A is a graph depicting induction of tenascin production (y-axis) by native human IL-13 (x-axis). [0097] FIG-® is a graph depicting the neutralization of NHP IL-13 activity by MJ2-7, as measured by inhibition of induction of tenascin production (y-axis) as a function of antibody concentration (x-axis). [0098] FIG 7 is a graph depicting binding of MJ2-7 or control antibodies to NHP-IL-13 bound to s!L-13Ro2-Fc coupled to a SPR chip. [0099] FIG 8 is a graph depicting binding of varying concentrations (0.09- 600 nM) of NHP EL-13 to captured hMJ2-7 V2-11 antibody. [0100] FIG 9 is a graph depicting the neutralization of NHP IL-13 activity by mouse MJ2-7 (•) or humanized Version 1 (o), Version 2 (»), or Version 3 (A) antibodies. NHP EL-13 activity was measured by phosphorylation of STAT6 (y-axis) as a function of antibody concentration (x-axis). [0101] FIG 10 is a graph depicting the neutralization of NHP IL-13 activity by antibodies including mouse MJ2-7 VH and VL (•), mouse VH and humanized Version 2 VL (A), or Version 2 VH and VL («). NHP IL-13 activity was measured by phosphorylation of STAT6 (y-axis) as a function of antibody concentration (x-axis). [0102] FIGs. llAand 11B are graphs depicting inhibition of binding of IL-13 to immobilized IL-13 receptor by MJ2-7 antibody, as measured by ^LISA. Binding is depicted as absorbance at 450 nm (y-axis). Concentration of MJ2-7 antibody is depicted on the x-axis. FIG 11A depicts binding to IL-13Ral. FIG 11B depicts binding to IL-13Ra2. [0103] FIG 12 is an alignment of DPK18 germline amino acid sequence (SEQ ID N0:l93) and humanized MJ2-7 Version 3 VL (SEQ ID NO:190). [0104] FIG. 13A is an amino acid sequence (SEQ ID NO:124) of mature, processed human EL-13. [0105] FIG. 13B is an amino acid sequence (SEQ ID NO:125) of human EL-13Rcd. DETAILED DESCRIPTION [0106} Binding agents (e.g., anti-IL13 antibody molecules) that bind specifically to EL-13 and modulate the ability of IL-13 to interact with DL-13 receptors and signaling mediators are disclosed. The agents can be used to modulate (e.g., inhibit) one or more EL-13-associated activities. IL-13 binding agents, e.g., as described herein, can be used to modulate one or more IL-13-associated activities, e.g., in vivo, e.g., to treat or prevent EL-13-mediated disorders (e.g., asthma, airway inflammation, atopic disorders, allergic responses, eosinophilia, fibrosis, and IL-13 associated cancers). [0107] Anti- IL-13 Antibody Molecules [0108] Numerous methods are available for obtaining antibody molecules. One exemplary method includes screening protein expression libraries, e.g., phage or ribosome display libraries. Phage display is described, for example, in Ladner et al., U.S. Patent No. 5,223,409; Smith (1985) Science 228:1315-1317; WO 92/18619; WO 91/17271; WO 92/20791; WO 92/15679; WO 93/01288; WO 92/01047; WO 92/09690; and WO 90/02809. In addition to the use of display libraries, other methods can be used to obtain an anti-IL-13 antibody molecule. For example, an IL-13 protein or a peptide thereof can be used as an antigen in a non-human animal, e.g., a rodent, e.g., a mouse, hamster, or rat. [0109] In one embodiment, the non-human animal includes at least a part of a human immunoglobulin gene. For example, it is possible to engineer mouse strains deficient in mouse antibody production with large fragments of the human Ig loci. Using the hybridoma technology, antigen-specific monoclonal antibodies derived from the genes with the desired specificity may be produced and selected. See, e.g., XENOMOUSE™, Greene/al. (1994)Nature Genetics 7:13-21, US 2003-0070185, WO 96/34096, published Oct. 31, 1996, and PCT Application No. PCT/US96/05928, filed Apr. 29,1996. [0110] In another embodiment, a monoclonal antibody is obtained from the non-human animal, and then modified, e.g., humanized or deimmunized. Winter describes an exemplary CDR-grafting method that may be used to prepare the humanized antibodies described herein (U.S. Patent No. 5,225,539). All of the CDRs of a particular human antibody may be replaced with at least a portion of a non-human CDR, or only some of the CDRs may be replaced with non-human CDRs. It is only necessary to replace the number of CDRs required for binding of the humanized antibody to ajgredetermined antigen. [0111] Humanized antibodies can be generated by replacing sequences of the Fv variable domain that are not directly involved in antigen binding with equivalent sequences from human Fv variable domains. Exemplary methods for generating humanized antibody molecules are provided by Morrison (1985) Science 229:1202-1207; by Oi et al. (1986) BioTechniques 4:214; and by US 5,585,089; US 5,693,761; US 5,693,762; US 5,859,205; and US 6,407,213. Those methods include isolating, manipulating, and expressing the nucleic acid sequences that encode all or part of immunoglobulin Fv variable domains from at least one of a heavy or light chain. Such nucleic acids may be obtained from a hybridoma producing an antibody against a predetermined target, as described above, as well as from other sources. The recombinant DNA encoding the humanized antibody molecule can then be cloned into an appropriate expression vector. [0112] An IL-13-binding antibody molecule may also be modified by specific deletion of human T cell epitopes or "deimmunization" by the methods disclosed in WO 98/52976 and WO 00/34317. Briefly, the heavy and light chain variable domains of an antibody can be analyzed for peptides that bind to MHC Class II; these peptides represent potential T-cell epitopes (as defined in WO 98/52976 and WO 00/34317). For detection of potential T-cell epitopes, a computer modeling approach termed "peptide threading" can be applied, and in addition a database of human MHC class II binding peptides can be searched for motifs present in the VH and VL sequences, as described in WO 98/52976 and WO 00/34317. These motifs bind to any of the 18 major MHC class n DR allotypes, and thus constitute potential T cell epitopes. Potential T-cell epitopes detected can be eliminated by substituting small numbers of amino acid residues in the variable domains, or preferably, by single amino acid substitutions. Typically, conservative substitutions are made. Often, but not exclusively, an amino acid common to a position in human germline antibody sequences may be used. Human germline sequences, e.g., are disclosed in Tomlinson, et al. (1992) J.Mol. Biol. 227:776-798; Cook, G. P. et al. (1995) Immunol. Today Vol. 16 (5): 237-242; Chothia, D. et al. (1992) /. Mol. Biol 227:799-817; and Tomlinson et al. (1995) EMBOJ. 14:4628-4638. The V BASE directory provides a comprehensive directory of human immunoglobulin variable region sequences (compiled by Tomlinson, l.A."efSl. MRC Centre for Protein Engineering, Cambridge, UK). These sequences can be used as a source of human sequence, e.g., for framework regions and CDRs. Consensus human framework regions can also be used, e.g., as described in US 6,300,064. [0113] Additionally, chimeric, humanized, and single-chain antibody molecules (e.g., proteins that include both human and nonhuman portions), may be produced using standard recombinant DNA techniques. Humanized antibodies may also be produced, for example, using transgenic mice that express human heavy and light chain genes, but are incapable of expressing the endogenous mouse immunoglobulin heavy and light chain genes. [0114] Additionally, the antibody molecules described herein also include those that bind to IL-13, interfere with the formation of a functional IL-13 signaling complex, and have mutations in the constant regions of the heavy chain. It is sometimes desirable to mutate and inactivate certain fragments of the constant region. For example, mutations in the heavy constant region can be made to produce antibodies with reduced binding to the Fc receptor (FcR) and/or complement; such mutations are ell known in the art. An example of such a mutation to the amino sequence of the >nstant region of the heavy chain of IgG is provided in SEQ ID N0:128. Certain ictive fragments of the CL and CH subunits (e.g., CHI) are covalently link to each >ther. A further aspect provides a method for obtaining an antigen-binding site that is specific for a surface of EL-13 that participates in forming a functional IL-13 signaling-:omplex. [0115] Exemplary antibody molecules can include sequences of VL chains as set forth in SEQ ID NOs:30-46, and/or of VH chains as set forth in and,SEQ ID NOs:50-l 15, but also can include variants of these sequences that retain IL-13 binding ability. Such variants may be derived from the provided sequences using techniques well known in the art. Amino acid substitutions, deletions, or additions, can be made in either the FRs or in the CDRs. Whereas changes in the framework regions are usually designed to improve stability and reduce immunogenicity of the antibody molecule, changes in the CDRs are usually designed to increase affinity of the antibody molecule for its target. Such affinity-increasing changes are typically determined empirically by altering the CDR regian and testing the antibody molecule. Such alterations can be made according to the methods described in Antibody Engineering, 2nd. ed. (1995), ed. Borrebaeck, Oxford University Press. [0116] An exemplary method for obtaining a heavy chain variable domain sequence that is a variant of a heavy chain variable domain sequence described herein, includes adding, deleting, substituting, or inserting one or more amino acids in a heavy chain variable domain sequence described herein, optionally combining the heavy chain variable domain sequence with one or more light chain variable domain sequences, and testing a protein that includes the modified heavy chain variable domain sequence for specific binding to IL-13, and (preferably) testing the ability of such antigen-binding domain to modulate one or more IL-13-associated activities. An analogous method may be employed using one or more sequence variants of a light chain variable domain sequence described herein. [0117] Variants of antibody molecules can be prepared by creating libraries with one or more varied CDRs and screening the libraries to find members that bind to IL-13, e.g., with improved affinity. For example, Marks et al. (Bio/Technology (1992) 10:779-83) describe methods of producing repertoires of antibody variable domains in which consensus primers directed at or adjacent to the 5'''' end of the variable domain area are used in conjunction with consensus primers to the third framework region of human VH genes to provide a repertoire of VH variable domains lacking a CDR3. The repertoire may be combined with a CDR3 of a particular antibody. Further, the CDR3-derived sequences may be shuffled with repertoires of VH or VL domains lacking a CDR3, and the shuffled complete VH or VL domains combined with a cognate VL or VH domain to provide specific antigen-binding fragments. The repertoire may then be displayed in a suitable host system such as the phage display system of WO 92/01047, so that suitable antigen-binding fragments can be selected. Analogous shuffling or combinatorial techniques are also disclosed by Stemmer (Nature (1994) 370:389-91). A further alternative is to generate altered VH or VL regions using random mutagenesis of one or more selected VH and/or VL genes to generate mutations within the entire variable domain. See, e.g., Gram et al. Proc. Nat. Acad. Sci. USA (1992) 89:3576-80. [0118] Another method that maybe used is to direct mutagenesis to CDR regions of VH^or^L genes. Such techniques are disclosed by, e.g., Barbas et al. (Proc. Nat. Acad. Sci. USA (1994) 91:3809-13) and Schier et al. (J. Mol. Biol. (1996) 263:551-67). Similarly, one or more, or all three CDRs may be grafted into a repertoire of VH or VL domains, or even some other scaffold (such as a fibronectin domain). The resulting protein is evaluated for ability to bind to EL-13. [0119] In one embodiment, a binding agent that binds to a target is modified, e.g., by mutagenesis, to provide a pool of modified binding agents. The modified binding agents are then evaluated to identify one or more altered binding agents which have altered functional properties (e.g., improved binding, improved stability, lengthened stability in vivo). In one implementation, display library technology is used to select or screen the pool of modified binding agents. Higher affinity binding agents are then identified from the second library, e.g., by using higher stringency or more competitive binding and washing conditions. Other screening techniques can also be used. [0120] In some embodiments, the mutagenesis is targeted to regions known or likely to be at the binding interface. If, for example, the identified binding agents are iimioouy moiccuies, men mwagenesis can DC directed to the CDR regions of the heavy or light chains as described herein. Further, mutagenesis can be directed to framework regions near or adjacent to the CDRs, e.g., framework regions, particular within 10, 5, or 3 amino acids of a CDR junction. In the case of antibodies, mutagenesis can also be limited to one or a few. of the CDRs, e.g., to make step-wise improvements. [0121] In one embodiment, mutagenesis is used to make an antibody more similar to one or more germline sequences. One exemplary germlining method can include: identifying one or more germline sequences that are similar (e.g., most similar in a particular database) to the sequence of the isolated antibody. Then mutations (at the amino acid level) can be made in the isolated antibody, either incrementally, in combination, or both. For example, a nucleic acid library that includes sequences encoding some or all possible germline mutations is made. The mutated antibodies are then evaluated, e.g., to identify an antibody that has one or more additional germline . residues relative to the isolated antibody and that is still useful (e.g., has a functional activity). In one embodiment, as many germline residues are introduced into an isolated antibody as possible. [0122] In one embodiment, mutagenesis is used to substitute or insert one or more germline residues into a CDR region. For example, the germline CDR residue can be from a germline sequence that is similar (e.g., most similar) to the variable domain being modified. After mutagenesis, activity (e.g., binding or other functional activity) of the antibody can be evaluated to determine if the germline residue or residues are tolerated. Similar mutagenesis can be performed in the framework regions. [0123] Selecting a germane sequence can be performed in different ways. For example, a germline sequence can be selected if it meets a predetermined criteria for selectivity or similarity, e.g., at least a certain percentage identity, e.g., at least 75,80, 85,90,91,92,93,94, 95,96,97,98,99, or 99.5% identity. The selection can be performed using at least 2,3,5, or 10 germline sequences. In the case of CDR1 and CDR2, identifying a similar germline sequence can include selecting one such sequence. In the case of CDR3, identifying a similar germline sequence can include selecting one such sequence, but may including using two germline sequences that separately contribute to the amino-terminal portion and the carboxy-terminal portion. In other implementations more than one or two germline sequences are used, e.g., to form a consensus sequence. [0124] In other embodiments, the antibody may be modified to have an altered glycosylation pattern (i.e., altered from the original or native glycosylation pattern). As used in this context, "altered" means having one or more carbohydrate moieties deleted, and/or having one or more glycosylation sites added to the original antibody. Addition of glycosylation sites to the presently disclosed antibodies may be accomplished by altering the amino acid sequence to contain glycosylation site consensus sequences; such techniques are well known in the art. Another means of increasing the number of carbohydrate moieties on the antibodies is by chemical or enzymatic coupling of glycosides to the amino acid residues of the antibody. These methods are described in, e.g., WO 87/05330, and Aplin and Wriston (1981) CRC Crit, Rev. Biochem. 22:259-306. Removal of any carbohydrate moieties present on the antibodies may be accomplished chemically or enzymatically as described in the art (Hakimuddin et al. (\9ST)Arch. Biochem. Biophys. 259:52; Edge et al. (\9&\)Anal. Biochem. 118:131; andThotakura-efc«L (1987) MtfA. Enzymol. 138:350). See, e.g., U.S. 5,869,046 fora modification that increases in vivo half life by providing a salvage receptor binding epitope. [0125] In one embodiment, an antibody molecule has CDR sequences that differ only insubstantially from those of MJ 2-7 or C65. Insubstantial differences include minor amino acid changes, such as substitutions of 1 or 2 out of any of typically 5-7 amino acids in the sequence of a CDR, e.g., a Chothia or Kabat CDR. Typically, an amino acid is substituted by a related amino acid having similar charge, hydrophobic, or stereochemical characteristics. Such substitutions are within the ordinary skills of an artisan. Unlike in CDRs, more substantial changes in structure framework regions (FRs) can be made without adversely affecting the binding properties of an antibody. Changes to FRs include, but are not limited to, humanizing a nonhuman-derived framework or engineering certain framework residues that are important for antigen contact or for stabilizing the binding site, e.g., changing the class or subclass of the constant region, changing specific amino acid residues which might alter an effector function such as Fc receptor binding (Lund et al. (1991) J. Immunol. 147:2657-62; Morgan et al. (1995) Immunology 86:319-24), or changing the species from which the constant region is derived. Antibodies may have mutations in the CH2 region of the heavy chain that reduce or alter effector function, e.g., Fc receptor binding and complement activation. For example, antibodies may have mutations such as those described in U.S. Patent Nos. 5,624,821 and 5,648,260. In the IgOl or IgG2 heavy chain, for example, such mutations may be made to resemble the amino acid sequence set forth in SEQ ID N0:17. Antibodies may also have mutations that stabilize the disulfide bond between the two heavy chains of an immunogiobulin, such as mutations in the hinge region of IgG4, as disclosed in the art (e.g., Angal et al. (1993) Mol Immunol 30:105-08). [0126] The IL-13 binding agents can be in the form of intact antibodies, antigen-binding fragments of antibodies, e.g., Fab, F(ab'''')z, Fd, dAb, and scFv fragments, and intact antibodies and fragments that have been mutated either in their constant and/or variable domain (e.g., mutations to produce chimeric, partially humanized, or fully humanized antibodies, as well as to produce antibodies with a desired trait, e.g., enhanced IL-13 binding and/or reduced FcR binding). ~-—;»c [0127] Antibody Production. Some antibody molecules, e.g., Fabs, can be produced in bacterial cells, e.g., E. coli cells. For example, if the Fab is encoded by sequences in a phage display vector that includes a suppressible stop codon between the display entity and a bacteriophage protein (or fragment thereof), the vector nucleic acid can be transferred into a bacterial cell that cannot suppress a stop codon. In this case, the Fab is not fused to the gene in protein and is secreted into the periplasm and/or media. [0128] Antibody molecules can also be produced in eukaryotic cells. In one embodiment, the antibodies (e.g., scFv''''s) are expressed in a yeast cell such as Pichia (see, e.g., Powers etal, (2001) JImmunol Methods, 251:123-35), Hanseula, or Saccharomyces. [0129] In one preferred embodiment, antibody molecules are produced in mammalian cells. Preferred mammalian host cells for expressing the clone antibodies or antigen-binding fragments thereof include Chinese Hamster Ovary (CHO cells) (including dhfr" CHO cells, described in Urlaub and Chasin (1980) Proc. Natl. Acad. Sci. USA 77:4216-4220, used with a DHFR selectable marker, e.g., as described in Kaufman and Sharp (1982) Mol. Biol. 159:601-621), lymphocytic cell lines, e.g., NSO myeloma cells and SP2 cells, COS cells, and a cell from a transgenic animal, e.g., a transgenic mammal. For example, the cell is a mammary epithelial cell. [0130] In addition to the nucleic acid sequences encoding the antibody molecule, the recombiiiant expression vectors may carry additional sequences, such as sequences that regulate replication of the vector in host cells (e.g., origins of replication) and selectable marker genes. The selectable marker gene facilitates selection of host cells into which the vector has been introduced (see e.g., U.S. Patents Nos. 4,399,216,4,634,665 and 5,179,017). For example, typically the selectable marker gene confers resistance to drugs, such as G418, hygromycin, or methotrexate, on a host cell into which the vector has been introduced. [0131] In an exemplary system for recombinant expression of an antibody molecule, a recombinant expression vector encoding both the antibody heavy chain and the antibody light chain is introduced into dhfr~ CHO cells by calcium phosphate-mediated transfection. Within the recombinant expression vector, the antibody heavy and light chain genSTare each operatively linked to enhancer/promoter regulatory elements (e.g., derived from SV40, CMV, adenovirus and the like, such as a CMV enhancer/AdMLP promoter regulatory element or an SV40 enhancer/AdMLP promoter regulatory element) to drive high levels of transcription of the genes. The recombinant expression vector also carries a DHFR gene, which allows for selection of CHO cells that have been transfected with the vector using methotrexate selection/amplification. The selected transformant host cells can be cultured to allow for expression of the antibody heavy and light chains and intact antibody is recovered fiom the culture medium. Standard molecular biology techniques can be used to prepare the recombinant expression vector, transfect the host cells, select for transformants, culture the host cells and recover the antibody molecule from the culture medium. For example, some antibody molecules can be isolated by affinity chromatography with a Protein A or Protein G coupled matrix. [0132] For antibody molecules that include an Fc domain, the antibody production system preferably synthesizes antibodies in which the Fc region is glycosylated. For example,-the Fc domain of IgG molecules is glycosylated at asparagine 297 in the CH2 domain. This asparagine is the site for modification with biantennary-type oligosaccharidcs. It has been demonstrated that this gjycosylation is required for effector functions mediated by Fey receptors and complement Clq (Burton and Woof (1992) Adv. Immunol. 51:1-84; Jefferis et al. (1998) Jmmunol. Rev. 163:59-76). In one embodiment, the Fc domain is produced in a mammalian expression system that appropriately glycosylates the residue corresponding to asparagine 297. The Fc domain can also include other eukaryotic post-translational modifications. [0133] Antibody molecules can also be produced by a transgenic animal. For example, U.S. Patent No. 5,849,992 describes a method of expressing an antibody in the mammary gland of a transgenic mammal. A transgene is constructed that includes a milk-specific promoter and nucleic acids encoding the antibody molecule and a signal sequence for secretion. The milk produced by females of such transgenic mammals includes, secreted-therein, the antibody of interest. The antibody molecule can be purified from the milk, or for some applications, used directly. [0134] Characterization [0135] The binding properties of a binding agent may be measured by any method, e.g., one of the following methods: BIACORE™ analysis, Enzyme Linked Immunosorbent Assay (ELISA), x-ray crystallography, sequence analysis and scanning mutagenesis. The ability of a protein to neutralize and/or inhibit one or more IL-13-associated activities may be measured by the following methods: assays for measuring the proliferation of an IL-13 dependent cell line, e.g. TFI; assays for measuring the expression of IL-13-mediated polypeptides, e.g., flow cytometric analysis of the expression of CD23; assays evaluating the activity of downstream signaling molecules, e.g., STAT6; assays evaluating production of tenascin; assays testing the efficiency of an antibody described herein to prevent asthma in a relevant animal model, e.g., the cynomolgus monkey, and other assays. An DL-13 binding agent, particularly an IL-13 antibody molecule, can have a statistically significant effect in one or more of these assays. Exemplary assays for binding properties include the following. [0136] The binding interaction of a IL-13 binding agent and a target (e.g., IL-13) can be analyzed using surface plasmon resonance (SPR). SPR or Biomolecular Interaction Analysis (BIA) detects biospecific interactions in real time, without labeling any of the interadants. Changes in the mass at the binding surface (indicative of a binding event) of the BIA chip result in alterations of the refractive index of light near the surface. The changes in the refractivity generate a detectable signal, which are measured as an indication of real-time reactions between biological molecules. Methods for using SPR are described, for example, in U.S. Patent No. 5,641,640; Raether (1988) Surface Plasmons Springer Verlag; Sjolander and Urbaniczky (1991) Anal. Chem. 63:2338-2345; Szabo et al. (1995) Curr. Opin. Struct. Biol. 5:699-705 and on-line resources provide by BIAcore International AB (Uppsala, Sweden). [0137] Information from SPR can be used to provide an accurate and quantitative measure of the equilibrium dissociation constant (Kseborrheic eczema (yellowish, oily, scaly patches of skin on the scalp, face, and occasionally other parts of the body). Additional particular symptoms include stasis dermatitis, atopic pleat (Dennie-Morgan fold), cheilitis, hyperlinear palms, hyperpigmented eyelids (eyelids that have become4grker in color from inflammation or hay fever), ichthyosis, keratosis pilaris, lichenification, papules, and urticaria. An IL-13 binding agent can be administered to ameliorate one or more of these symptoms. [0149] An exemplary method for treating allergic rhinitis or other allergic disorder can include initiating therapy with an IL-13 binding agent prior to exposure to an allergen, e.g., prior to seasonal exposure to an allergen, e.g., prior to allergen blooms. Such therapy can include one or more doses, e.g., doses at regular intervals. fOlSOl Cancer [0151] IL-13 and its receptors may b e involved in the development of at least some types of cancer, e.g., a cancer derived from hematopoietic cells or a cancer derived from brain or neuronal cells (e.g., a glioblastoma). For example, blockade of the IL-13 signaling pathway, e.g., via use of a soluble IL-13 receptor or a STAT6 -/-deficient mouse, leads to delayed tumor onset and/or growth of Hodgkins lymphoma cell lines or a metastatic mammary carcinoma, respectively (Trieu et al. (2004) Cancer Res. 64:3271-75; Ostrand''''-Rosenberg et al. (2000) J. Immunol. 165: 6015-6019). fincers that express IL-13R(2 (Husain and Puri (2003) J, Neurooncol. 65:3,7-48; Mintz et at. (2003) J. Neurooncol. 64:117-23) can be specifically targeted by anti-IL-13 antibodies described herein. EL-13 binding agents, e.g., anti-IL-13 antibody molecules, can be useful to inhibit cancer cell proliferation or other cancer cell activity. A cancer refers to one or more cells that has a loss of responsiveness to normal growth controls, and typically proliferates with reduced regulation relative to a corresponding normal cell. [0152] Examples of cancers against which IL-13 binding agents (e.g., an IL-13 binding agent such as an antibody or antigen binding fragment described herein) can be used for treatment include leukemias, e.g., B-cell chronic lymphocytic leukemia, acute myelogenous leukemia, and human T-cell leukemia virus type 1 (HTLV-1) transformed T cells; lymphomas, e.g. T cell lymphoma, Hodgkin''''s lymphoma; glioblastomas; pancreatic cancers; renal cell carcinoma; ovarian carcinoma; and AIDS-Kaposi''''s sarcoma. . For example, an IL-13 binding agent (e.g., an anti-IL-13 antibody molecule) can be administered in an amount effective to treat or prevent the disorder, e.g., to reduce cell-pwliferation, or to ameliorate at least one symptom of the disorder. r01531 Fibrosis [0154] IL-13 binding agents can also be useful in treating inflammation and fibrosis, e.g., fibrosis of the liver. IL-13 production has been correlated with the progression of liver inflammation (e.g., viral hepatitis) toward cirrhosis, and possibly, hepatocellular carcinoma (de Lalla et al. (2004) J. Immunol. 173:1417-1425). Fibrosis occurs, e.g., when normal tissue is replaced by scar tissue, often following inflammation. Hepatitis B and hepatitis C viruses both cause a fibrotic reaction in the liver, which can progress to cirrhosis. Cirrhosis, in turn, can evolve into severe complications such as liver failure or hepatocellular carcinoma. Blocking IL-13 activity using the IL-13 binding agents, e.g., anti-IL-13 antibodies, described herein can reduce inflammation and fibrosis, e.g., the inflammation, fibrosis, and cirrhosis associated with liver diseases, especially hepatitis B and C. For example, an EL-13 binding agent (e.g., an anti-IL-13 antibody molecule) can be administered in an amount effective to treat or prevent the disorder or to ameliorate at least one symptom of the inflammatory and/or fibrotic disorder. [01551 Inflammatory Bowel Disease [0156] Inflammatory bowel disease (EBD) is the general name for diseases that cause inflammation of the intestines. Two examples of inflammatory bowel disease are Crohn''''s disease and ulcerative colitis. EL-13/STAT6 signaling has been found to be involved in inflammation-induced hypercoritractivity of mouse smooth muscle, a model of inflammatory bowel disease (Akiho et at. (2002) Am. J. Physiol. Gastrointest. Liver Physiol. 282:6226-232). For example, an IL-13 binding agent (e.g., an anti-IL-13 antibody molecule) can be administered in an amount effective to treat or prevent the disorder or to ameliorate at least one symptom of the inflammatory bowel disorder. [01571 Additional IL-13 Binding agents [0158] Also provided are binding agents, other than binding agents that are antibodies and fragments thereof, that bind to IL-13, particularly binding agents that compete with MJ2-7 or C65 and other antibodies described herein for binding to EL-13. For example, the binding agents can bind to the same epitope or an overlapping epitope as MJ2-7 or C65 on IL-13. The binding agents preferably inhibit or neutralize IL-13 activity. FofeSSmple, the binding agents inhibit binding of IL-13 to EL 13Raland, e.g., does not prevent binding of IL-13 to IL-4Ra,. Such binding agents can be used in the methods described herein, e.g., the methods of treating and preventing disorders. All embodiments described herein can be adapted for use with IL-13 binding agents. [0159] Binding agents can be identified by a number of means, including modifying a variable domain described herein or grafting one or more CDRs of a variable domain described herein onto another scaffold domain. Binding agents can also be identified from diverse libraries, e.g., by screening. One method for screening protein libraries uses phage display. Particular regions of a protein are varied and proteins that interact with IL-13 are identified, e.g., by retention on a solid support or by other physical association. To identify particular binding agents that bind to the same epitope or an overlapping epitope as MJ2-7 or C65 on IL-13, binding agents can be eluted by adding MJ2-7 or C65 (or related antibody), or binding agents can be evaluated in competition experiments with MJ2-7 or C65 (or related antibody). It is also possible to deplete the library of agents that bind to other epitopes by contacting the library to a complex-that contains IL-13 and MJ2-7 or C65 (or related antibody). The depleted library can then be contacted to IL-13 to obtain a binding agent (hat binds to IL-13 but not to IL-13 when it is bound by MJ 2-7 or C65. It js also possible to use peptides from IL-13 that contain the MJ 2-7 or C65 epitope as a target. [0160] Phage display is described, for example, in U.S. Patent No. 5,223,409; Smith (1985) Science 228:1315-1317; WO 92/18619; WO 91/17271; WO 92/20791; WO 92/15679; WO 93/01288; WO 92701047; WO 92/09690; WO 90/02809; WO 94/05781; Fuchs et al. (1991) Bio/Technology 9:1370-1372; Hay et al. (1992) Hum Antibod Hybridomas 3:81-85; Huse et al. (1989) Science 246:1275-1281; Griffiths et al. (1993) EMBO J 12:725-734; Hawkins et al. (1992) JMol Biol 226:889-896; Clackson et al. (1991) Nature 352:624-628; Gram et al (1992) PNAS 89:3576-3580; Garrard et al. (1991) Bio/Technology 9:1373-1377; Rebar et al. (1996) Methods Enzymol. 267:129-49; and BarbasW al. (1991) PNAS 88:7978-7982. Yeast surface display is described, e.g., in Boder and Wittrup (1997) Nat. Biotechnol. 15:553-557. Another form of display is ribosome display. See, e.g., Mattheakis et al. (1994) Proc. Natl. Acad. Set. USA 91:9022 andHanes etal. (2000) Nat Biotechnol. 18:1287-92; Hanese/a/. (20QO) Methods Enzymol. 328:404-30. and Schaffitzel et al. (1999)/ Immunol Methods. 231(1-2):! 19-35. [0161] Binding agents that bind to EL-13 can have structural features of one scaffold proteins, e.g., a folded domain. An exemplary scaffold domain, based on an antibody, is a "minibody" scaffold has been designed by deleting three beta strands from a heavy chain variable domain of a monoclonal antibody (Tramontane) et al., 1994, J. Mol. Recognit. 7:9; and Martin etal., 1994,EMBOJ. 13:5303-5309). This domain includes 61 residues and can be used to present two hypervariable loops, e.g., one or more hypervariable loops of a variable domain described herein or a variant described herein. In another approach, the binding agent includes a scaffold domain that is a V-like domain (Coia et al. WO 99/45110). V-like domains refer to a domain that has similar structural features to the variable heavy (VH) or variable light (VL) domains of antibodies. Another scaffold domain is derived from tendamistatin, a 74 residue, six-strand beta sheet sandwich held together by two disulfide bonds (McConnell and Hoess, 1995, J. Mol. Biol. 250:460). This parent protein includes three loops. The loops can be modified (e.g., using CDRs or hypervariable loops described herein) or varied, e.g., to select domains that bind to IL-13. WO 00/60070 describes a (J-sandwich structure derived from the naturally occurring extracellular domain of CTLA-4 that can be used as a scaffold domain. [0162] Still another scaffold domain for an 1L-13 binding agent is a domain based on the fibronectin type IE domain or related fibronectin-like proteins. The overall fold of the fibronectin type HI (Fn3) domain is closely related to that of the smallest functional antibody fragment, the variable domain of the antibody heavy chain. Fn3 is a p-sandwich similar to that of the antibody VH domain, except that Fn3 has seven p-strands instead of nine. There are three loops at the end of Fn3; the positions of BC, DE and FG loops approximately correspond to those of CDR1,2 and 3 of the VH domain of an antibody. Fn3 is advantageous because it does not have disulfide bonds. Therefore, Fn3 is stable under reducing conditions, unlike antibodies and their fragments (see WO 98/56915; WO 01/64942; WO 00/34784). An Fn3 domain can be modified (e.g., using CDRs or hypervariable loops described herein) or varied, e.g., to select domains that bind to IL-13. [0163] StHl other exemplary scaffold domains include: T-cell receptors; MHC proteins; extracellular domains (e.g., fibronectin Type in repeats, EOF repeats); protease inhibitors (e.g., Kunitz domains, ecotin, BPTI, and so forth); TPR repeats; trifoil structures; zinc finger domains; DNA-binding proteins; particularly monorneric DNA binding proteins; RNA binding proteins; enzymes, e.g., proteases (particularly inactivated proteases), RNase; chaperones, e.g., thioredoxin, and heat shock proteins; and intracellular signaling domains (such as SH2 and SH3 domains). US 20040009530 describes examples of some alternative scaffolds. [0164] Examples of small scaffold domains include: Kunitz domains (58 amino acids, 3 disulfide bonds), Cucurbida maxima trypsin inhibitor domains (31 amino acids, 3 disulfide bonds), domains related to guanylin (14 amino acids, 2 disulfide bonds), domains related to heat-stable enterotoxin IA from gram negative bacteria (18 amino acids, 3 disulfide bonds), EOF domains (50 amino acids, 3 disulfide bonds), kringle domains (60 amino acids, 3 disulfide bonds), fungal carbohydrate-binding domains (35 amino acids, 2 disulfide bonds), endothelin domains (18 amino acids, 2 disulfide bonds), and Streptococeal G IgG-binding domain (35 amino acids, no disulfide bonds). Examples of small intracellular scaffold domains include SH2, SH3, and EVH domains. Generally, any modular domain, intracellular or extracellular, can be used. [0165] Exemplary criteria for evaluating a scaffold domain can include: (1) amino acid sequence, (2) sequences of several homologous domains, (3) 3-dimensional structure, and/or (4) stability data over a range of pH, temperature, salinity, organic solvent, oxidant concentration. In one embodiment, the scaffold domain is a small, stable protein domains, e.g., a protein of less than 100,70,50,40 or 30 amino acids. The domain may include one or more disulfide bonds or may chelate a metal, e.g., zinc. [0166] Still other binding agents are based on peptides, e.g., proteins with an amino acid sequence that are less than 30,25,24,20,18,15, or 12 amino acids. Peptides can be incorporated in a larger protein, but typically a region that can independently bind to IL-13, e.g., to an epitope described herein. Peptides can be identified byphage display. See, e.g., US 20040071705. [0167] An IL-13 binding agent may include non-peptide linkages and other chemical modification. For example, part or all of the binding agent may be synthesized as aTp^eptidomimetic, e.g., a pepjoid (see, e.g., Simon et al. (1992) Proc. Natl. Acad. Sci. USA 89:9367-71 and Horwell (1995) Trends Biotechnol. 13:132-4). A binding agent may include one or more (e.g., all) non-hydrolyzable bonds. Many non-hydrolyzable peptide bonds are known in the art, along with procedures for synthesis of peptides containing such bonds. Exemplary non-hydrolyzable bonds include — [CH2NH]- reduced amide pepride bonds, -[COCH:]- ketomethylene peptide bonds, — [CH(CN)NH]-(cyanomethylene)amino peptide bonds, -[CH2CH(OH)]» hydroxyethylene peptide bonds, --[CH2O]-peptide bonds, and --[CH2S]--thiomethylene peptide bonds (see e.g., U.S. Pat. No. 6,172,043). F01681 Pharmaceutical Compositions [0169] The EL-13 binding agents, e.g. antibody molecules that bind to IL-13 (such as those described herein) can be used in vitro, ex vivo, or in vivo. They can be incorporated into a pharmaceutical composition, e.g., by combining the IL-13 binding agent with a pharmaceutically acceptable carrier. Such a composition may contain, in addition to the IL-13 binding agent and carrier, various diluents, fillers, salts, buffers, stabilizers, solubilizers, and other materials well known in the art. Pharmaceutically ! acceptable materials is generally a nontoxic material that does not interfere with the effectiveness of the biological activity of an IL-13 binding agent. The characteristics of the carrier can depend on the route of administration. [0170] The pharmaceutical composition described herein may also contain other factors, such as, but not limited to, other anti-cytokine antibody molecules or other anti-inflammatory agents as described in more detail below. Such additional factors and/or agents may be included in the pharmaceutical composition to produce a synergistic effect with an IL-13 binding agent, e.g., anti-IL-13 antibody molecule, described herein. For example, in the treatment of allergic asthma, a pharmaceutical composition described herein may include anti-LL-4 antibody molecules or drugs known to reduce an allergic response. [0171] The pharmaceutical composition described herein may be in the form of a liposome in which an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, such as one described herein is combined, in addition to other pharmaceutically acceptable carriers, with amphipathic agents such as lipids that exist in aggregated form as micelles, insoluble monolayers, liquid crystals, or lamellar layers while in aqueous solution. Suitable lipids for liposomal formulation include, without limitation, monoglycerides, diglycerides, sulfatides, lysolecithin, phospholipids, saponin, bile acids, and the like. Exemplary methods for preparing such liposomal formulations include methods described in U.S. Patent Nos. 4,235,871; 4,501,728; 4,837,028; and 4,737,323. [0172] As used herein, the term "therapeutically effective amount" means the total amount of each active component of the pharmaceutical composition or method that is sufficient to show a meaningful patient benefit, e.g., amelioration of symptoms of, healing of, or increase in rate of healing of such conditions. When applied to an individual active ingredient, administered alone, the term refers to that ingredient alone. When applied to a combination, the term refers to combined amounts of the active ingredients that result in the therapeutic effect, whether administered in combination, serially or simultaneously. [0173] In practicing the method of treatment or use, a therapeutically effective amount of IL-13 binding agent, e.g., an anti-lL-13 antibody molecule, e.g., an antibody molecule that binds to EL-13 and interferes with the formation of a functional IL-13 signaling complex (and, e.g., neutralizes or inhibits one or more IL-13-associated activities), is administered to a subject, e.g., mammal (e.g., a human). An IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, may be administered in accordance with a method described herein either alone as well as in combination with other therapies such as treatments employing cytokines, lymphokines or other hematopoietic factors, cancer therapeutics, or anti-inflammatory agents. When coadministered with one or more agents, an IL-13 binding agent, e.g., an anti-EL-13 antibody molecule, may be administered either simultaneously with the second agent, or sequentially. If administered sequentially, a physician can select an appropriate sequence for administering the IL-13 binding agent in combination with other agents. [0174] Administration of an EL-13 binding agent, e.g., an anti-IL-13 antibody molecule, used in the pharmaceutical composition can be carried out in a variety of conventional ways^-such as oral ingestion, inhalation, or cutaneous, subcutaneous, or intravenous injection. When a therapeutically effective amount of an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, is administered by intravenous, cutaneous or subcutaneous injection, the binding agent can be prepared as a pyrogen-free, parenterally acceptable aqueous solution. The composition of such parenterally acceptable protein solutions can be adapted in view factors such as pH, isotonicity, stability, and the like, e.g., to optimize the composition for physiological conditions, binding agent stability, and so forth. A pharmaceutical composition for intravenous, cutaneous, or subcutaneous injection can contain, e.g., an isotonic vehicle such as Sodium Chloride Injection, Ringer''''s Injection, Dextrose Injection, Dextrose and Sodium Chloride Injection, Lactated Ringer''''s Injection, or other vehicle as known in the art. The pharmaceutical composition may also contain stabilizers, preservatives, buffers, antioxidants, or other additive. [0175] The amount of an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, in the pharmaceutical composition can depend upon the nature and severity of the condition being treated, and on the nature of prior treatments that the patient has undergone. The pharmaceutical composition can be administered to normal patients or patients who do not show symptoms, e.g., in a prophylactic mode. An attending physician may decide the amount of IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, with which to treat each individual patient. For example, an attending physician can administer low doses of antagonist and observe the patient''''s response. Larger doses of antagonist may be administered until the optimal therapeutic effect is obtained for the patient, and at that point the dosage is not generally increased further. For example, a pharmaceutical may contain between about 0.1 mg to 50 mg antibody per kg body weight, e.g., between about 0.1 mg and 5 mg or between about 8 mg and 50 mg antibody per kg body weight. In one embodiment in which the antibody is delivered subcutaneously at a frequency of no more than twice per month, e.g., every other week or monthly, the composition includes an amount of about 0.7-3.3, e.g., 1.0-3.0 mg/kg, e.g., about 0.8-1.2,1.2-2.8, or 2.8-3.3 mg/kg. * [0176] The duration of therapy using the pharmaceutical composition may vary, depending on the severity of the disease being treated and the condition and potential idiosyncratic response of each individual patient. In one embodiment, the IL-13 binding agen£ eTg., an anti-IL-13 antibody molecule, can also be administered via the subcutaneous route, e.g., in the range of once a week, once every 24,48,96 hours, or not more frequently than such intervals. Exemplary dosages can be in the range of 0.1-20 mg/kg, more preferably 1-10 mg/kg. The agent can be administered, e.g., by intravenous infusion at a rate of less than 20,10,5, or 1 mg/min to reach a dose of about 1 to 50 mg/m2 or about 5 to 20 mg/m2. [0177] In one embodiment, an administration of a IL-13 binding agent to the patient includes varying the dosage of the protein, e.g., to reduce or minimize side effects. For example, the subject can be administered a first dosage, e.g., a dosage less than a therapeutically effective amount. In a subsequent interval, e.g., at least 6, 12,24, or 48 hours later, the patient can be administered a second dosage, e.g., a dosage that is at least 25,50,75, or 100% greater than the first dosage. For example, the second and/or a comparable third, fourth and fifth dosage can be at least about 70, 80,90, or 100% of a therapeutically effective amount. [0178] Inhalation [0179] A composition that includes an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, can be formulated for inhalation or other mode of pulmonary delivery. Accordingly, the IL-13 binding agent can be administered by inhalation to pulmonary tissue. The term "pulmonary tissue" as used herein refers to any tissue of the respiratory tract and includes both the upper and lower respiratory tract, except where otherwise indicated. An IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, can be administered in combination with one or more of the existing modalities for treating pulmonary diseases. [0180] In one example the EL-13 binding agent is formulated for a nebulizer. In one embodiment, the IL-13 binding agent can be stored in a lyophilized form (e.g., at room temperature) and reconstituted in solution prior to inhalation. It is also possible to formulate the IL-13 binding agent for inhalation using a medical device, e.g., an inhaler. See, e.g., U.S. 6,102,035 (a powder inhaler) and 6,012,454 (a dry powder inhaler). The inhaler can include separate compartments for the IL-13 binding agent at a pH suitable fdrttorage and another compartment for a neutralizing buffer and a mechanism for combining the IL-13 binding agent with a neutralizing buffer immediately prior to atomization. In one embodiment, the inhaler is a metered dose inhaler. [0181] The three common systems used to deliver drugs locally to the pulmonary air passages include dry powder inhalers (DPIs), metered dose inhalers (MDIs) and nebulizers. MDIs, the most popular method of inhalation administration, may be used to deliver medicaments in a solubilized form or as a dispersion. Typically MDIs comprise a Freon or other relatively high vapor pressure propellant that forces aerosolized medication into the respiratory tract upon activation of the device. Unlike MDIs, DPIs generally rely entirely on the inspiratory efforts of the patient to introduce a medicament in a dry powder form to the lungs. Nebulizers form a medicament aerosol to be inhaled by imparting energy to a liquid solution. Direct pulmonary delivery of drugs during liquid ventilation or pulmonary lavage using a fluorochemical medium has also been explored. These and other methods can be used to deliver an IL-13 binding agent, e.g., anti-IL-13 antibody molecule. In one embodiment, the EL-13 binding agent is associated with a polymer, e.g., a polymer that stabilizes or increases half-life of the compound. [0182] For example, for administration by inhalation, an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, is delivered in the form of an aerosol spray from pressured container or dispenser which contains a suitable propellant or a nebulizer. The IL-13 binding agent may be in the form of a dry particle or as a liquid. Particles that include the DL-13 binding agent can be prepared, e.g., by spray drying, by drying an aqueous solution of the IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, with a charge neutralizing agent and then creating particles from the dried powder or by drying an aqueous solution in an organic modifier and then creating particles from the dried powder. * [0183] The IL-13 binding agent may be conveniently delivered in the form of an aerosol spray presentation from pressurized packs or a nebulizer, with the use of a suitable propellant, e.g., dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, carbon dioxide or other suitable gas. In the case of a pressurized aerosol, the dosage unit maybe determined by providing a valve to deliver a metered amount. Capsules and cartridges for use in an inhaler or insufflator may be formulated containing a powder mix of an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, and a suitable powder base such as lactose or starch, if the particle is a formulated particle. In addition to the formulated or unformulated compound, other materials such as 100% DPPC or other surfactants can be mixed with the IL-13 binding agent to promote the delivery and dispersion of formulated or unformulated compound. Methods of preparing dry particles are described, for example, in WO 02/32406. [0184] An IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, can be formulated for aerosol delivery, e.g., as dry aerosol particles, such that when administered it can be rapidly absorbed and can produce a rapid local or systemic therapeutic result. Administration can be tailored to provide detectable activity within 2 minutes, 5 minutes, 1 hour, or 3 hours of administration. In some embodiments, the peak activity can be achieved even more quickly, e.g., within one half hour or even within ten minutes. An IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, can be formulated for longer biological half-life (e.g., by association with a polymer such as PEG) for use as an alternative to other modes of administration, e.g., suc^ that the IL-13 binding agent enters circulation from the lung and is distributed to other organs or to a particular target organ. [0185] In one embodiment, the IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, is delivered in an amount such that at least 5% of the mass of the polypeptide is delivered to the lower respiratory tract or the deep lung. Deep lung has • an extremely rich capillary network. The respiratory membrane separating capillary lumen from the alveolar air space is very thin ( ^ urn) and extremely permeable. In addition, the liquid layer lining the alveolar surface is rich in lung surfactants. In other embodiments, at least 2%, 3%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, or 80% of the composition of an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, is delivered to the lower respiratory tract or to the deep lung. Delivery to either or both of these tissues results in efficient absorption of the IL-13 binding agent and high bioavailabiliry. In one embodiment, the tL-13 binding agent is provided in a metered dose using, e.g., an inhaler or nebulizer. For example, the IL-13 binding agent is delivered in a dosage unit form of at least about 0.02,0.1,0.5,1,1.5,2, 5,10,20,40, or 50 mg/puff or more. The percent bioavailability can be calculated as follows: the percent bioavailability = (AUCnon-invMive/AUCj.v. OT, c) x (dosei.v. OTS.C./dosenon.inv«ive) x 100. [0186] Although not necessary, delivery enhancers such as surfactants can be used to further enhance pulmonary delivery. A "surfactant" as used herein refers to a. IL-13 binding agent having a hydrophilic and lipophilic moiety, which promotes absorption of a drug by interacting with an interface between two immiscible phases. Surfactants are useful in the dry particles for several reasons, e.g., reduction of particle agglomeration, reduction of macrophage phagocytosis, etc. When coupled with lung surfactant, a more efficient absorption of the IL-13 binding agent can be achieved because surfactants, such as DPPC, will greatly facilitate diffusion of the compound. Surfactants are well known in the art and include but are not limited to phosphoglycerides, e.g., phosphatidylcholines, L-alpha-phosphatidylcholine dipalmitoyl (DPPC) and diphosphatidyl glycerol (DPPG); hexadecanol; fatty acids; polyethylene glycol (PEGX polyoxyethylene-9-; auryl ether; palmitic acid; oleic acid; sorbitan trioleale (Span 85); glycocholate; surfactin; poloxomcr; sorbitan fatty acid ester, sorbitan trioleate; tyloxapol; and phospholipids. f 01871 Stabilization [0188] In one embodiment, an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, is physically associated with a moiety that improves its stabilization and/or retention in circulation, e.g., in blood, serum, lymph, bronchopulmonary lavage, or other tissues, e.g., by at least 1.5,2, 5,10, or 50 fold. [0189] For example, an IL-13 binding agent, e.g., an anti-DL-13 antibody molecule, can be associated with a polymer, e.g., a substantially non-antigenic polymers, such as polyalkylene oxides or polyethylene oxides. Suitable polymers will vary substantially by weight. Polymers having molecular number average weights ranging from about 200 to about 35,000 (or about 1,000 to about 15,000, and 2,000 to about 12,500) can be used. [0190] For example, an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, can be conjugated to a water soluble polymer, e.g., hydrophilic polyvinyl polymers, e.g. polyvinylalcohol and polyvinylpyrrolidone. A non-limiting list of such polymers includes polyalkylene oxide homopolymers such as polyethylene glycol (PEG) or polypropylene glycols, polyoxyethylenated polyols, copolymers thereof and block copolymers thereof, provided that the water solubility of the block copolymers is maintained. Additional useful polymers include polyoxyalkylenes such as polyoxyethylene, polyoxypropylene, and block copolymers of polyoxyethylene and polyoxypropylene (Pluronics); polymethacrylates; carbomers; branched or unbranched polysaccharides which comprise the saccharide monomers D-mannose, D- and L-galactose, fucose, fructose, D-xylose, L-arabinose, D-glucuronic acid, sialic acid, D-galacturonic acid, D-mannuronic acid (e.g. polymannuronic acid, or alginic acid), D-glucosamine, D-galactosamine, D-glucose and neuraminic acid including homopolysaccharides and heteropolysaccharides such as lactose, amylopectin, starch, hydroxyethyl starch, amylose, dextran sulfate, dextran, dextrins, glycogen, or the polysaccharide subunit of acid mucopolysaccharides, e.g. hyaluronic acid; polymers of sugar alcohols such as polysorbitol and polymannitol; heparin or heparan. |Uty 1J Tne conjugates of an IL-13 binding agent, e.g., an anti-IL-13 antibody ipmolccufe, and a polymer can be separated from the unrcacted starting materials, e.g., by gel filtration or ion exchange chromatography, e.g., HPLC. Heterologous species of the conjugates are purified from one another in the same fashion. Resolution of different species (e.g. containing one or two PEG residues) is also possible due to the difference in the ionic properties of the unreacted amino acids. See, e.g., WO 96/34015. [01921 Use of IL-13 binding agents to modulate one or more IL-13-associated . activities in vivo [0193] In yet another aspect, the invention features a method for modulating (e.g., decreasing, neutralizing and/or inhibiting) one or more associated activities of IL-13 in vivo by administering an IL-13 binding agent, e,g., an anti-IL-13 antibody molecule, described herein, in an amount sufficient to inhibit its activity. An IL-13 binding agent can also be administered to subjects for whom inhibition of an IL-13-mediated inflammatory response is required. These conditions include, e.g., airway inflammation, asthma, fibrosis, eosinophilia and increased mucus production. [0194] Tb.e~eiBcacy.of an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, described herein can be evaluated, e.g., by evaluating ability of the antagonist to modulate airway inflammation in cynomolgus monkeys exposed to an Ascaris suum allergen. An IL-13 binding agent, particularly one that inhibits at least one IL-13 activity, can be used to neutralize or inhibit one or more LL-13-associated activities, e.g., to reduce IL-13 mediated inflammation in vivo, e.g., for treating or preventing IL-13-associated pathologies, including asthma and/or its associated symptoms. [0195] In one embodiment, an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, e.g., pharmaceutical compositions thereof, is administered in combination therapy, i.e., combined with other agents, e.g., therapeutic agents, that are useful for treating pathological conditions or disorders, such as allergic and inflammatory disorders. The term "in combination" in this context means that the agents are given substantially contemporaneously, either simultaneously or sequentially. If given sequentially, at the onset of administration of the second compound, the first of the two compounds is preieraoiy sun delectable at etlective concentrations at the site of [0196] • For example, the combination therapy can include one or more IL-13 binding agents, e.g., anti-IL-13 antibodies and fragments thereof, e.g., that bind to IL-13 and interfere with the formation of a functional IL-13 signaling complex, coformulated with, and/or coadministered with, one or more additional therapeutic agents, e.g., one or more cytokine and growth factor inhibitors, immunosuppressants, anti-inflammatory agents, metabolic inhibitors, enzyme inhibitors, and/or cytotoxic or cytostatic agents, as described in more detail below. Furthermore, one or more an DL-13 binding agent, e.g., an anti-IL-13 antibody molecule, may be used in combination with two or more of the therapeutic agents described herein. Such combination therapies may advantageously utilize lower dosages of the administered therapeutic agents, thus avoiding possible toxicities or complications associated with the various monotherapies. Moreover, the therapeutic agents disclosed herein act on pathways that differ from the IL-13 / IL-13-receptor pathway, and thus are expected to enhance and/or synergize with the effects of the IL-13 binding agents. [0197] Therapeutic agents that interfere with different triggers of asthma or airway inflammation, e.g., therapeutic agents used in the treatment of allergy, upper respiratory infections, or ear infections, may be used in combination with an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule. In one embodiment, one or more IL-13 binding agents, e.g., anti-IL-13 antibodies and fragments thereof, maybe coformulated with, and/or coadministered with, one or more additional agents, such as other cytokine or growth factor antagonists (e.g., soluble receptors, peptide inhibitors, small molecules, adhesins), antibody molecules that bind to other targets (e.g., antibodies that bind to other cytokines or growth factors, their receptors, or other cell surface molecules), and anti-inflammatory cytokines or agonists thereof. Nonlimiting examples of the agents that can be used in combination with IL-13 binding agents, e.g., anti-IL-13 antibodies and fragments thereof, include, but are not limited to, inhaled steroids; beta-agonists, e.g., short-acting or long-acting beta-agonists; antagonists of leukotrienes or leukotriene receptors; combination drugs such as ADVAIR*; IgE inhibitors, e.g., anti-IgE antibodies (e.g., XOLAIR*); phosphodiesterase inhibitors (e.g., PDE4 inhibitors); xanthines; anticholinergic drugs; mast cell-stabilizing agents >uch as cromolyn; IL-4 inhibitors; IL-5 inhibitors; eotaxin/CCR3 inhibitors; and intihistamines. 0198] In other embodiments, one or more IL-13 binding agents, e.g., anti- IL-13 antibody molecules, can be co formulated with, and/or coadministered with, one 3r more anti-inflammatory drugs, immunosuppressants, or metabolic or enzymatic inhibitors. Examples of the drugs or inhibitors that can be used in combination with the CL-13 binding agents, e.g., anti-IL-13 antibodies and fragments thereof, include, but are lot limited to, one or more of: Additional examples of therapeutic agents that can be ;oadministered and/or coformulated with one or more anti-IL-13 antibodies or lagments thereof include one or more of: TNF antagonists (e.g., a soluble fragment of i TNF receptor, e.g., p55 or p75 human TNF receptor or derivatives thereof, e.g., 75 kd FNFR-IgG (75 kD TNF receptor-IgG fusion protein, ENBREL™)); TNF enzyme * mtagonists, e.g., TNFa converting enzyme (TACE) inhibitors; muscarinic receptor mtagonists; TGF-p antagonists; interferon. gamma; perfenidone; chemothcrapeutic igents, e.g., methotrexate, leflunomide, or a sirolimus (rapamycin) or an analog thereof, ;.g., CCI-779; COX2 and cPLA2 inhibitors; NSAIDs; immunomodulators; p38 ~—s»r nhibitors, TPL-2, Mk-2 and NFxB inhibitors, among others. ''''0199] Vaccine Formulations $200] In another aspect, the invention features a method of modifying an immune response associated with immunization. An EL-13 binding agent (e.g., an anti-IL-13 antibody molecule), can be used to increase the efficacy of immunization by inhibiting IL-13 activity. IL-13 binding agents can be administered before, during, or after delivery of an immunogen, e.g., administration of a vaccine. In one embodiment, the immunity raised by the vaccination is a cellular immunity, e.g., an immunity against cancer cells or virus infected, e.g., retrovirus infected, e.g., HIV infected, cells. In one embodiment, the vaccine formulation contains one or more IL-13 binding agents and an antigen, e.g., an immunogen. In another embodiment, the IL-13 binding agent and the immunogen are administered separately, e.g., within one hour, three hours, one day, or wo days of each other. The IL-13 binding agent can be one that neutralizes or inhibits >ne or more IL-13 activities. [0201] Inhibition ofIL-13 can improve the efficacy of, e.g., cellular vaccines, e.g., vaccines against diseases such as cancer and viral infection, e.g., retroviral infection, e.g., HIV infection. Induction of CDS* cytotoxic T lymphocytes (CTL) by vaccines is down modulated by CD4* T cells, likely through the cytokine IL-13. Inhibition of IL-13 has been shown to enhance vaccine induction of CTL response (Ahlers et al. (2002) Proc. Natl. Acad. Sci. USA 99:13020-10325). An IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, an antibody described herein, can be use in conjunction with a vaccine to increase vaccine efficacy. Cancer and viral infection (such as retroviral (e.g., HIV) infection) are exemplary disorders against which a cellular vaccine response can be effective. Vaccine efficacy is enhanced by blocking IL-13 signaling at the time of vaccination (Ahlers et al. (2002) Proc. Nat. Acad. Sci. USA 99:13020-25). A vaccine formulation may be administered to a subject in the form of a pharmaceutical or therapeutic composition. [02Q21 Methods for Diagnosing, Prognosing. and Monitoring Disorders [0203] IL-13 binding agents can be used in vitro and in vivo as diagnostic agents. One exemplary method includes: (i) administering the IL-13 binding agent •—as" (e.g., an IL-13 antibody molecule) to a subject; and (ii) detecting the IL-13 binding agent in the subject. The detecting can include determining location of the IL-13 binding agent in the subject. Another exemplary method includes contacting an IL-13 binding agent to a sample, e.g., a sample from a subject. The presence or absence of EL-13 or the level of IL-13 (either qualitative or quantitative) in the sample can be determined. [0204] In another aspect, the present invention provides a diagnostic method for detecting the presence of a IL-13, in vitro (e.g., a biological sample, such as tissue, biopsy) or in vivo (e.g., in vivo imaging in a subject). [0205] The method includes: (i) contacting a sample with IL-13 binding agent; and (ii) detecting formation of a complex between the IL-13 binding agent and the sample. The method can also include contacting a reference sample (e.g., a control sample) with the binding agent, and determining the extent of formation of the complex between the binding agent an the sample relative to the same for the reference sample. A change, e.g., a statistically significant change, in the formation of the complex in the sample or subject relative to the control sample or subject can be indicative of the presence of IL-13 in the sample. [0206] Another method includes: (i) administering the IL-13 binding agent to a subject; and (ii) detecting formation of a complex between the IL-13 binding agent and the subject. The detecting can include determining location or time of formation of the complex. [0207] The IL-13 binding agent can be directly or indirectly labeled with a detectable substance to facilitate detection of the bound or unbound protein. Suitable detectable substances include various enzymes, prosthetic groups, fluorescent materials, luminescent materials and radioactive materials. [0208] Complex formation between the IL-13 binding agent and IL-13 can be detected by measuring or visualizing either the binding agent bound to the IL-13 or unbound binding agent. Conventional detection assays can be used, e.g., an enzyme-linked immunosorbent assays (ELISA), a radioimmunoassay (RIA) or tissue —«*^ immunohistochemistry. Further to labeling the 3L-13 binding agent, the presence of IL-13 can be assayed in a sample by a competition immunoassay utilizing standards labeled with a detectable substance and an unlabeled IL-13 binding agent. In one example of this assay, the biological sample, the labeled standards and tha FJL-13 binding agent are combined and the amount of labeled standard bound to the unlabeled binding agent is determined. The amount of 3L-13 in the sample is inversely proportional to the amount of labeled standard bound to the IL-13 binding agent. [02091 Methods for Diagnosing. Prognosing. and/or Monitoring Asthma {0210] The binding agents described herein can be used, e.g., in methods for diagnosing, prognosing, and monitoring the progress of asthma by measuring the level of EL-13 in a biological sample. In addition, this discovery enables the identification of new inhibitors of IL-13 signaling, which will also be useful in the treatment of asthma. (0211] Such methods for diagnosing allergic and nonallergic asthma can include detecting an alteration (e.g., a decrease or increase) of IL-13 in a biological sample, e.g., serum, plasma, bronchoalveolar lavage fluid, sputum, etc. "Diagnostic" or ''''diagnosing" means identifying the presence or absence of a pathologic condition. Diagnostic methods involve detecting the presence of IL-13 by detennining a tesl fimount of IL-13 polypeptidc in a biological sample, e.g., in bronchoalveolar lavage fluid, from a subject (human or nonhuman mammal), and comparing the test amount with a normal amount or range (i.e., an amount or range from an individual(s) known not to suffer from asthma) for the IL-13 polypeptide. While a particular diagnostic method may not provide a definitive diagnosis of asthma, it suffices if the method provides a positive indication that aids in diagnosis. [0212] Methods for prognosing asthma and/or atopic disorders can include detecting upregulation of IL-13, at the mRNA or protein level. "Prognostic" or "prognosing" means predicting the probable development and/or severity of a pathologic condition. Prognostic methods involve detennining the test amount of IL-13 in a biological sample from a subject, and comparing the test amount to a prognostic amount or range (i.e., an amount or range from individuals with varying severities of asthma) for IL-13. Various amounts of the IL-13 in a test sample are consistent with certain prognoses for asthma. The detection of an amount of IL-13 at a particular prognostic level pto^des a prognosis for the subject. [0213] The present application also provides methods for monitoring the course of asthma by detecting the upregulation of IL-13. Monitoring methods involve determining the test amounts of IL-13 in biological samples taken from a subject at a first and second time, and comparing the amounts. A change in amount of IL-13 between the first and second time can indicate a change in the course of asthma and/or atopic disorder, with a decrease in amount indicating remission of asthma, and an increase in amount indicating progression of asthma and/or atopic disorder. Such monitoring assays are also useful for evaluating the efficacy of a particular therapeutic intervention (e.g., disease attenuation and/or reversal) in patients being treated for an IL-13 associated disorder. [0214] Fluorophore- and chromophore-labeled binding agents can be prepared. The fluorescent moieties can be selected to have substantial absorption at wavelengths above 310 run, and preferably above 400 nm. A variety of suitable fluorescers and chromophores are described by Stryer (1968) Science, 162:526 and Brand, L. et al. (1972) Annual Review ofBtpchemistiy, 41 -.843-868, The binding agents can be labeled with fluorescent chromophore groups by conventional procedures such as those disclosed in U.S. Patent Nos. 3,940,475,4,289,747, and 4,376,110. One group of fluorescers having a number of the desirable properties described above is the xanthenc dyes, which include the ftuoresceins and rhodamines. Another group of fluorescent compounds are the naphthylamines. Once labeled with a fluorophore or chromophore, the binding agent can be used to detect the presence or localization of the IL-13 in a sample, e.g., using fluorescent microscopy (such as confocal or deconvolution microscopy). [0215] Histological Analysis. Immunohistochemistry can be performed using the binding agents described herein. For example, in the case of an antibody, the antibody can synthesized with a label (such as a purification or epitope tag), or can be detectably labeled, e.g., by conjugating a label or label-binding group. For example, a chelator can be attached to the antibody. The antibody is then contacted to a histological preparation, e.g., a fixed section of tissue that is on a microscope slide. After an incubation for binding, the preparation is washed to remove unbound antibody. The preparation is then analyzed, e.g., using microscopy, to identify if the antibody bound to the preparation. The antibody (or other polypeptide or peptide) can be unlabeled at the time of binding. After binding and washing, the antibody is labeled in order to render it detectable. [0216] Protein Arrays. An IL-13 binding agent (e.g., a protein that is an IL-13 binding agent) can also be immobilized on a protein array. The protein array can be used as a diagnostic tool, e.g., to screen medical samples (such as isolated cells, blood, sera, biopsies, and the like). The protein array can also include other binding agents, e.g., ones that bind to IL-13 or to other target molecules. [0217] Methods of producing protein arrays are described, e.g., in De Wildt et al. (2000) Net. Biotechnol. 18:989-994; Lucking et al (1999) Anal. Biochem. 270:103-111; Ge (2000) Nucleic Adds Res. 28, e3,1-VH; MacBeath and Schreiber (2000) Science 289:1760-1763; WO 01/40803 and WO 99/51773A1. Polypeptides for the array can be spotted at high speed, e.g., using commercially available robotic apparati, e.g., from Genetic MicrqSystems or BioRobotics. The array substrate can be, for example, nitrocellulose, plastic, glass, e.g., surface-modified glass. The array can also include a porous matrix, e.g., acrylamide, agarose, or another polymer. For example, the array can be an array of antibodies, e.g., as described in De Wildt, supra. Cells that produce the protein can be grown on a filter in an arrayed format, proteins production is induced, and the expressed protein are immobilized to the filter at the location of the cell. [0218] A protein array can be contacted with a sample to determine the extent of IL-13 in the sample. If the sample is unlabeled, a sandwich method can be used, e.g., using a labeled probe, to detect binding of the EL-13. Information about the extent of binding at each address of the array can be stored as a profile, e.g., in a computer database. The protein array can be produced in replicates and used to compare binding profiles, e.g., of different samples. [0219] Flow Cytometry. The IL-13 binding agent can be used to label cells, e.g., cells in a sample (e.g., a patient sample). The binding agent can be attached (or attachable) to a fluorescent compound. The cells can then be analyzed by flow cytometry and/or sorted using fluorescent activated cell sorted (e.g., using a sorter available from Becton Dickinson Immunocytometry Systems, San Jose CA; see also —»=- U.S. Patent No. 5,627,037; 5,030,002; and 5,137,809). As cells pass through the sorter, a laser beam excites the fluorescent compound while a detector counts cells that pass through and determines whether a fluorescent compound is attached to the cell by detecting fluorescence. The amount of label bound to each cell can be quantified and analyzed to characterize the sample. The sorter can also deflect the cell and separate cells bound by the binding agent from those cells not bound by the binding agent. The separated cells can be cultured and/or characterized. [0220] In vivo Imaging. In still another embodiment, the invention provides a method for detecting the presence of a IL-13 within a subject in vivo. The method includes (i) administering to a subject (e.g., a patient having an IL-13 associated disorder) an anti-IL-13 antibody, conjugated to a detectable marker; (ii) exposing the subject to a means for detecting the detectable marker. For example, the subject is imaged, e.g., by NMR or other tomographic means. [0221] Examples of labels useful for diagnostic imaging include radiolabels such as nil, u''''ln, ml, 99mTc, MP, 3JP, I251,3H, )4C. and mRh, fluorescent labels such as fluorescein and rhodamine, nuclear magnetic resonance active labels, positron emitting isotopes detectable by a positron emission tomography ("PET") scanner, chemiluminescers such as luciferin, and enzymatic markers such as peroxidase or phosphatase. Short-range radiation emitters, such as isotopes detectable by short-range detector probes can also be employed. The binding agent can be labeled with such reagents using known techniques. For example, see Wensel and Meares (1983) Radioimmunoimaging and Radioimmunotherapy, Elsevier, New York for techniques relating to the radiolabeling of antibodies and Colcher et a!. (1986) Meth. Enzymol. 121: 802-816. A radiolabeled binding agent can also be used for in vitro diagnostic tests. The specific activity of a isotopically-labeled binding agent depends upon the half-life, the isotopic purity of the radioactive label, and how the label is incorporated into the antibody. Procedures for labeling polypeptides with the radioactive isotopes (such as I4C, 3H, 35S, USI, "To, 32P, 13P, and I31I) are generally known. See, e.g., U.S. 4,302,438; Coding, J.W. (Monoclonal antibodies: principles and practice ''''.production and application of monoclonal antibodies in cell biology, biochemistry, and immunology 2nd ed. London; Orlando: Academic Press, 1986. pp 124-126) and the references citedLjljgrein; and A.R. Bradwell et al., "Developments in Antibody Imaging", Monoclonal Antibodies for Cancer Detection and Therapy, R.W. Baldwin et al., (eds.), pp 65-85 (Academic Press 1985). [0222] IL-13 binding agents described herein can be conjugated to Magnetic Resonance Imaging (MRI) contrast agents. Some MRI techniques are summarized in EP-A-0 502 814. Generally, the differences in relaxation time constants Tl and T2 of water protons in different environments is used to generate an image. However, these differences can be insufficient to provide sharp high resolution images. The differences in these relaxation time constants can be enhanced by contrast agents. Examples of such contrast agents include a number of magnetic agents paramagnetic agents (which primarily alter Tl) and ferromagnetic or superparamagnetic (which primarily alter T2 response). Chelates (e.g., EDTA, DTPA and NTA chelates) can be used to attach (and reduce toxicity) of some paramagnetic substances (e.g., Fe3+, Mn2*, Gd3*). Other agents can be in the form of particles, e.g., less than 10 urn to about 10 run in diameter) and having ferromagnetic, antiferromagnetic, or superparamagnetic properties. The IL-13 binding agents can also be labeled with an indicating group containing the NMR ctive I9F atom, as described by Pykett (1982) Scientific American, 246:78-88 to locate and image IL-13 distribution. [0223] Also within the scope described herein are kits comprising an IL-13 binding agent and instructions for diagnostic use, e.g., the use of the IL-13 binding agent (e.g., an antibody molecule or other polypeptide or peptide) jo detect IL-13, in vitro, e.g., in a sample, e.g., a biopsy or cells from a patient having an IL-13 associated disorder, or in vivo, e.g., by imaging a subject. The kit can further contain a least one additional reagent, such as a label or additional diagnostic agent. For in vivo use the binding agent can be formulated as a pharmaceutical composition. [02241 Kits [0225] An IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, can be # provided in a kit, e.g., as a component of a kit. For example, the kit includes (a) an IL-13 binding agent, e.g., an anti-EL-13 antibody molecule, and, optionally (b) informational material. The informational material can be descriptive, instructional, marketing or other material that relates to a method, e.g., a method described herein. »r The informational material of the kits is not limited in its form. In one embodiment, the informational material can include information about production of the compound, molecular weight of the compound, concentration, date of expiration, batch or production site information, and so forth. In one embodiment, the informational material relates to using the IL-13 binding agent to treat, prevent, diagnose, prognose, or monitor a disorder described herein. [0226] In one embodiment, the informational material can include instructions to administer an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, in a suitable manner to perform the methods described herein, e.g., in a suitable dose, dosage form, or mode of administration (e.g., a dose, dosage form, or mode of administration described herein). In another embodiment, the informational material can include instructions to administer an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, to a suitable subject, e.g., a human, e.g., a human having, or at risk for, allergic asthma, non-allergic asthma, or an IL-13 mediated disorder, e.g., an allergic and/or inflammatory disorder, or HTLV-1 infection. IL-13 production has been correlated with HTLV-1 infection (Chung et al., (2003) Blood 102:4130-36). [0227] For example, the material can include instructions to administer an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, to a patient, a patient with or at risk for allergic asthma, non-allergic asthma, or an IL-13 mediated disorder, e.g., an allergic and/or inflammatory disorder, or HTLV-1 infection. [0228] The kit can include one or more containers for the composition containing an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule. In some embodiments, the kit contains separate containers, dividers or compartments for the composition and informational material. For example, the composition can be contained in a bottle, vial, or syringe, and the informational material can be contained in a plastic sleeve or packet. In other embodiments, the separate elements of the kit are contained within a single, undivided container. For example, the composition is contained in a bottle, vial or syringe that has attached thereto the informational material in the form of a label. In some embodiments, the kit includes a plurality (e.g., a pack) of individual containers, each containing one or more unit dosage forms (e.g., a dosage form described herein) of an IL-13 binding agent, e.g., anti-IL-13 antibody molecule. For example^tbsJdt includes a plurality of syringes, ampules, foil packets, atomizers or inhalation devices, each containing a single unit dose of an IL-13 binding agent, e.g., an anti-IL-13 antibody molecule, or multiple unit doses. [0229] The kit optionally includes a device suitable for administration of the composition, e.g., a syringe, inhalant, pipette, forceps, measured spoon, dropper (e.g., eye dropper), swab (e.g., a cotton swab or wooden swab), or any such delivery device. In a preferred embodiment, the device is an implantable device that dispenses metered doses of the binding agent. [0230] The Examples that follow are set forth to aid in the understanding of the inventions but are not intended to, and should not be construed to, limit its scope in any way. EXAMPLES F02311 Example 1 [0232] (a) Cloning of NHP-IL-13 and homology to human IL-13 [0233] The cynomolgus monkey EL-13 (NHP IL-13) was cloned using hybridization probes. A comparison of the cynomolgus monkey IL-13 amino acid sequence to that of human IL-13 is shown in FIG. 1 A. There is 94% amino acid identity between the two sequences, due to 8 amino acid differences. One of these differences, R130Q, represents a common human polymorphism preferentially expressed in asthmatic subjects (Heinzmann et al. (2000) Hum. Mol. Genet. 9:549-559). [0234] 0) Binding of NHP-IL-13 to human IL13Rcc2 [0235] Human IL-13 binds with high affinity to the alpha2 form of IL-13 receptor (IL13Ra2). A soluble form of this receptor was expressed with a human IgGl Fc tail (sIL13Rn the surface of monocytes. Results showed that cynomolgus IL-13 had bioactivity on irimary human monocytes. 0238] (ii) STAT6 phosphorvlation on HT-29 cells. The human HT-29 epithelial cell line responds to IL-13 by undergoing STAT6 phosphorylation, a •.onsequence of signal transduction through the IL-13 receptor. To assay the ability of •ecombinant NHP-IL-13 to induce STAT6 phosphorylation, HT-29 cells were :hallenged with the NHP-EL-13 for 30 minutes at 37 °C, then fixed, permeabilized, and itained with fluorescent antibody to phospho-STAT6. Results showed that cynomolgus L-13 efficiently induced STAT6 phosphorylation in this human cell line. 0239] (d) Generation of antibodies that bind to NHP-IL-13 [0240] Mice or other appropriate animals may be immunized and boosted with cynomolgus IL-13, e.g., using one or more of the following methods. One method for immunization may be combined with either the same or different method for boosting: [0241] (i) Immunization with cynomolgus IL-13 protein expressed in E. coli, purified from inclusion bodies, and refolded to preserve biological activity. For immunization, the protein is emulsified with complete Freund''''s adjuvant (CFA), and mice are immunized according to standard protocols. For boosting, the same protein is emulsified with incomplete Freund''''s adjuvant (IFA). [0242] (ii) Immunization with peptides spanning the entire sequence of mature cynomolgus IL-13. Each peptide contains at least one amino acid that is unique to cynomolgus IL-13 and not present in the human protein. See FIG. IB. Where the peptide has a C-teiminal residue other than cysteine, a cysteine is added for conjugation to a carrier protein. The peptides are conjugated to an immunogenic carrier protein such as KLH, and used to immunize mice according to standard protocols. For immunization,.{he protein is emulsified with complete Freund''''s adjuvant (CFA), and mice are immunized according to standard protocols. For boosting, the same protein is emulsified with incomplete Freund''''s adjuvant (IFA). [0243] (iii) Immunization with NHP-IL-13 - encoding cDNA expressed. The cDNA encoding NHP-IL-13, including leader sequence, is cloned into an appropriate vector. This DNA is coated onto gold beads which are injected intradermally by gene gun. [0244] (iv) The protein or peptides can be used as a target for screening a protein library, e.g., a phage or ribosome display library. For example, the library can display varied immunoglobulin molecules, e.g., Fab''''s, scFv''''s, or Fd''''s. [0245] (e) Selection of antibody clones cross-reactive with NHP and optionally a human IL-13, e.g., a native human IL-13. [0246] Primary screen [0247] The primary screen for antibodies was selection for binding to recombinant NHP-IL-13 by ELISA. In this ELISA, wells are coated with recombinant NHP EL-13. The immune serum was added in serial dilutions and incubated for one hour at room temperature. Wells were washed with PBS containing 0.05% TWEEN®-20 (PBS-Tween). Bound antibody was detected using horseradish peroxidase (HRP)-labeled anti-mouse IgG and tetramethylbenzidene (TMB) substrate. Absorbance was read at 450 nm. Typically, all immunized mice generated high liters of antibody to NHP-EL-13. [0248] Secondary screen [0249] The secondary screen was selection for inhibition of binding of recombinantNHP-DL-13 to sEL-13Ral-Fc by ELISA. Wells were coated with soluble IL-13Ral-Fc, to which FLAG-tagged NHP-EL-13 could bind. "This binding was detected with anti-FLAG antibody conjugated to HRP. Hydrolysis of TMB substrate was read as absorbance at 450 nm. In the assay, the FLAG-tagged NHP-IL-13 was added together with increasing concentrations of immune serum. If the immune serum contained antibodyuiat bound to NHP-IL-13 and prevented its binding to the sEL13Ral-Fc coating the wells, the ELISA signal was decreased. All immunized mice produced antibody that competed with sIL13Ral-Fc binding to NHP-IL-13, but the liters varied from mouse to mouse. Spleens were selected for fusion from animals whose serum showed inhibited sIL13Ral-Fc binding to NHP-IL-13 at the highest dilution. [0250] Tertiary screen [0251 ] The tertiary screen tested for inhibition of NHP-IL-13 bi oactivity. Several bioassays were available to be used, including the TF-1 proliferation assay, the monocyte CD23 expression assay, and the HT-29 cell STAT6 phosphorylation assay. Immune sera were lested for inhibition of NHP-EL-13 - mediated STAT6 phosphorylation. The HT-29 human epithelial cell line was challenged for 30 minutes at 37 °C with recombinant NHP-IL-13 in the presence or absence of the indicated concentration of mouse immune serum. Cells were then fixed, permeabilized, and stained with ALEXA™ Fluor 488-conjugated mAb to phospho-STAT6 (Pharmingen). The percentage of cells responding to IL-13 by undergoing STAT6 phosphorylation was determined by flow cytometry. Spleens of mice with the most potent neutralization activity, determined as the strongest inhibition of NHP-IL-13 bioactivity at a high serum dilution, were selected for generation of hybridornas. [0252] Quaternary Screen [0253] A crude preparation containing human IL-13 was generated from human umbilical cord blood mononuclear cells (BioWhittaker/Cambrex). The cells were cultured in a 37 °C incubator at 5% CC>2, in RPMI media containing 10% heat-inactivated PCS, 50 U/ml penicillin, 50 mg/ml streptomycin, and 2 mM L-glutamine. Cells were stimulated for 3 days with the mitogen PHA-P (Sigma), and skewed toward Th2 with recombinant human IL-4 (R&D Systems) and antiJiuman IL-12. The Th2 cells were expanded for one week with IL-2, then activated to produce cytokine by treatment with phorbol 12-myristate 13-acetate (PMA) and ionomycin for three days. The supernatant was collected and dialyzed to remove PMA and ionomycin. To deplete GM-CS£*nd IL-4, which could interfere with bioassays for IL-13, the supernatant was treated with biotinylated antibodies to GM-CSF and IL-4 (R&D Systems, Inc), then incubated with streptavidin-coated magnetic beads (Dynal). The final concentration of IL-13 was determined by ELISA (Biosource), and for total protein by Bradford assay (Bio-Rad). The typical preparation contains < 0.0005% IL-13 by weight. [0254] Selection of hybridoma clones [0255] Using established methods, hybridornas were generated from spleens of mice selected as above, fused to the P3X63_AG8.653 myeloma cell line (ATCC). Cells were plated at limiting dilution and clones were selected according to the screening criteria described above. Data was collected for the selection of clones based on ability to compete for NHP-IL-13 binding to sIL13Ral-Fc by ELISA. Clones were further tested for ability to neutralize the bioactivity of NHP-IL-13. Supernatants of the hybridomas were tested for competition of STAT-6 phosphorylation induced by NHP-IL-13 in the HT-29 human epithelial cell line. [0256] Example 2: MJ 2-7 Antibody [0257] Total RNA was prepared from MJ 2-7 hybriiloina cells using the QIAGEN RNEASY™ Mini Kit (Qiagen). RNA was reverse transcribed to cDNA using the SMART™ PCR Synthesis Kit (BD Biosciences Clqntech). The variable region of MJ 2-7 heavy chain was extrapolated by PCR using SMART™ oligonucleotide as a forward primer and mlgGl primer annealing to DNA encoding the N-terminal part of CHI domain of mouse IgGl constant region as a reverse primer. The DNA fragment encoding MJ 2-7 light chain variable region was generated using SMART™ and mouse kappa specific primers. The PCR reaction was performed using DEEP VENT™ DNA polymerase (New England Biolabs) and 25 nM of dNTPs for 24 cycles (94 °C for 1 minute, 60 °C for 1 minute, 72 °C for 1 minute). The PCR products were subcloned into the pED6 vector, and the sequence of the inserts was identified by DNA sequencing. N-terminal protein sequencing of the-purified mouse MJ 2-7 antibody was used to confirm that the translated sequences corresponded to the observed protein sequence. [0258] ^. Exemplary nucleotide and amino acid sequences of mouse monoclonal antibody MJ 2-7 which interacts with NHP JL-13 and which has characteristics which suggest that it may interact with human IL-13 are as follows: [0259] An exemplary nucleotide sequence encoding the heavy chain variable domain includes: GAS GTTCAGCTGC AGCAGTCTGG GGCAGAGCTT GTGAAGCCAG GGGCCTCAGT CAAGTTGTCC TGCACAGGTT CTGGCTTCAA CATTAAAGAC ACCTATATAC ACTGGGTGAA GCAGAGGCCT GAACAGGGCC TGGAGTGGAT TGGAAGGATT GATCCTGCGA ATGATAATAT TAAATATGAC CCGAAGTTCC AGGGCAAGGC CACTATAACA GCAGACACAT CCTCCAACAC AGCCTACCTA CAGCTCAACA GCCTGACATC TGAGGACACT GCCGTCTATT ACTGTGCTAG ATCTGAGGAA AATTGGTACG ACTTTTTTGA CTACTGGGGC CAAGGCACCA CTCTCACAGT CTCCTCA (SEQ ID NO:129) [0260] An exemplary amino acid sequence for the heavy chain variable domain includes: FVQT.nn5;nART.VKPGASVXLSCTGSGFNIKDTYlHWVKORPEOGLEWIGRIDP ANDNIKYDPKFQGKATITADTSSNTAYLQLNSLTSEDTAVYYCARSEENWYD FFDYWGQGTTLTVSS (SEQ ID NO: 130) [0261] CDRs are underlined. The variable domain optionally is preceded by a leader sequence, e.g., MKCSWVIFFLMAVVTGVNS (SEQ ID NO: 131). An exemplary nucleotide sequence encoding the light chain variable domain includes: GAT GTTTTGATGA CCCAAACTCC ACTCTCCCTG CCTGTCAGTC TTGGAGATCA AGCCTCCATC TCTTGCAGGT CTAGTCAGAG CATTGTACAT AGTAATGGAA ACACCTATTT AGAATGGTAC CTGCAGAAAC CAGQCCAGTC TCCAAAGCTC CTGATCTACA AAGTTTCCAA CCGATTTTCT GGGGTCCCAG ACAGGTTCAG TGGCAGTGGA TCAGGGACAG ATTTCACACT CAAGATTAGC AGAGTGGAGG CTGAGGATCT GGGAGTTTAT TACTGCTTTC AAGGTTCACA TATTCCGTAC "ACSfTTCGGAG GGGGGACCAA GCTGGAAATA AAA (SEQ ID NO-.132) [0262] An exemplary amino acid sequence for the light chain variable domain includes: DVLMTOTPLSLPVSLGDQASISCRSSOSIVHSNGNTYLEWYLOKPGO SPKLLIYKVSNRFSGVPDRFSGSGSGTDFTLKISRVEAEDLGVYYCFOGSHIPY TFGGGTKLEK (SEQ ID NO: 133) [0263] CDRs are underlined. The amino acid sequence optionally is preceded by a leader sequence, e.g., MKLPVRLLVLMFWIPASSS (SEQ ID NO: 134). The term "NO 2-7" is used interchangeably with the term "mAbV.l.l," herein. [02641 Example3: C65 Antibody [0265] Exemplary nucleotide and amino acid sequences of mouse monoclonal antibody C65, which interacts with NHP EL-13 and which has characteristics that suggest that it may interact with human IL-13 are as follows: [0266] An exemplary nucleic acid sequence for the heavy chain variable domain includes: 1 ATGGCTGTCC TGGCATTACT .CTTCTGCCTG GTAACATTCC CAAGCTGTAT 51 CCTTTCCCAG GTGCAGCTGA AGGAGTCAGG ACCTGGCCTG GTGGCGCCCT 101 CACAGAGCCT GTCCATCACA TGCACCGTCT CAGGGTTCTC ATTAACCGGC 151 TATGGTGTAA ACTGGGTTCG CCAGCCTCCA GGAAAGGGTC TGGAGTGGCT 201 GGGAATAATT TGGGGTGATG GAAGCACAGA CTATAATTCA GCTCTCAAAT 251 CCAGACTGAT CATCAACAAG GACAACTCCA AGAGCCAAGT TTTCTTAAAA 301 ATGAACAGTC TGCAAACTGA TGACACAGCC AGGTACTTCT GTGCCAGAGA 3)51 TAAGACTTTT TACTACGATG GTTTCTACAG GGGCAGGATG GACTACTGGG 401 GTCAAGGAAC CTCAGTCACC GTCTCCTCA (SEQ ID NO: 135) * [0267] An exemplary amino acid sequence for the heavy chain variable domain includes: QVQLKESGPGLJ/APSQSLSIT CTVSGFSLTG YGVNWVRQPP GKGLEWLGII WGDGSTDYNS ALKSRLIINK DNSKSQVFLK MNSLQTDDTA RYFCARDKTF YYDGFYRGRM DYWGQGTSVT VSS (SEQ ID NO:136) CDRs are underlined. The amino acid sequence optionally is preceded by a leader sequence, e.g., MAVLALLFCL VTFPSCILS (SEQ ID NO: 137). [0268] An exemplary nucleotide sequence encoding the light chain variable domain includes: 1 ATGAACACGA GGGCCCCTGC TGAGTTCCTT GGGTTCCTGT TGCTCTGGTT 51 TTTAGGTGCC AGATGTGATG TCCAGATGAT TCAGTCTCCA TCCTCCCTGT 101 CTGCATCTTT GGGAGACATT GTCACCATGA CTTGCCAGGC AAGTCAGGGC 151 ACTAGCATTA ATTTAAACTG GTTTCAGCAA AAACCAGGGA AAGCTCCTAA 201 OCTCCTQATC TTTGGTGCAA GCAACTTGGA AGATGGGGTC CCATCAAGGT 251 TCAGTGGCAG TAGATATGGG ACAAATTTCA CTCTCACCAT CAGCAGCCTG 301 GAGGATGAAG ATATGGCAAC TTATTTCTGT CTACAGCATA GTTATCTCCC 351 GTGGACGTTC GGTGGCGGCA CCAAACTGGA AATCAAA (SEQ ID NO: 138) [0269] An exemplary ammo acid sequence for the light chain variable domain includes: DVQMIQSP SSLSASLGDIVTMTCOASOG TSINLNWFOQ KPGKAPKLLI FGASNLEDGV PSRFSGSRYG TNFTLTISSL EDEDMATYFC LOHSYLPWTF GGGTKLEIK (SEQIDNO-.139) CDRs are underlined. The amino acid sequence optionally is preceded by a leader sequence, e.g., MNTRAPAEFLGFLLLWFLGARC (SEQ ID NO: 140). ["02701 Example 4LCvnomolgus Monkey Model [0271] The efficacy of an antibody to neutralize one or more IL-13-associated activities in vivo can be tested using a model of antigen-induced airway inflammation in cynomolgus monkeys naturally allergic to Ascaris suum. In this model, challenge of an allergic monkey with Ascaris suum antigen results in an influx of inflammatory cells, especially eosinophils, into the airways.. To test the ability of an antibody to prevent this influx of cells, the antibody can be administered 24 hours prior to challenge with Ascaris suum antigen. On the day of challenge, a baseline bronchoalveolar lavage (BAL) sample can be taken from the left lung. The antigen can then be instilled intratracheally into the right lung. Twenty-four hours later, the right lung is lavaged, and the BAL fluid from animals treated intravenously with 10 mg/kg recombinant antibody expressed from CHO cells are compared to BAL fluid from untreated animals. If the antibody reduces airway inflammation, an increase ?n percent BAL eosinophils may be observed among the untreated group, but not for the antibody-treated group. These assays can be used to confirm that the antibody effectively prevents airway eosinophilia in allergic animals challenged with an allergen. [0272] Example 5: Fc sequences [0273] The Ser at position #1 of SEQ ID NO:128 represents amino acid residue #119 in a first exemplary full length antibody numbering scheme in which the Ser is preceded by residue #118 of a heavy chain variable domain. In the first exemplary full length antibody numbering scheme, mutated amino acids are at numbered 234 and 237, and correspond to positions 116 and 119 of SEQ ID NO:128. Thus, the following icquence represents an Fc domain with two mutations: L234A and G237A, according o the first exemplary full length antibody numbering scheme. STKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPA VLQSSGLYSLSSVVTVPSSSLGTQTYIO^VNHKPSNTKVDKKVEPKSGDKTHTC PPCPAPEALGAPSVFLFPPKPKDTLMISRTPEVTCVWDVSHEDPEVKFNWYVD GVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPI EKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIAVEWESNGQ PENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQ KSLSLSPGK (SEQ ID NO: 128) [0274] The following is another exemplary human Fc domain sequence: STKGPSVITLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPA VLQSSGLYSI^SVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPKSCDKTHTC PPCPAPELLGGPSWLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVD GVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPI EKTISKAKGQPREPQVYTIJ''''PSREEMTKNQVSLTCLVKGFYPSDIAVEWESNGQ PENNYKTTPPVLDSDGSFTLYSKLTVDKSRWQQGNWSCSVMHEALHNHYTQ KSLSLSPGK (SEQ ID NO: 141) [0275] Other exemplary alterations that can be used to decrease effector function include L234A;L235A), ( L235A;G237A), and N297A. F02761 Example 6: IL-13 and IgE in Mice [0277] IL-13 is involved in the production of IgE, an important mediator of atopic disease. Mice deficient in IL-13 had partial reductions in serum IgE and mast cell IgE responses, whereas mice lacking the natural IL-13 binding agent, TL-l3Ra2-l-, had enhanced levels of IgE and IgE effector function. [0278] BALB/c female mice were obtained from Jackson Laboratories (Bar Harbor, ME). IL-13Ro2-/- mice are described, e.g., in Wood et al. (2003,1 J. Exp. Afed. 197:703-9. Mice deficient in IL-13 are described, e.g., in McKenzie et al. (1998) Immunity 9:423-32. All mutant strains were on the BALB/c background. [0279] Serum IgB levels were measured by ELISA. ELISA plates (MaxiSorp; Nunc, Rochester, NY) were coated overnight at 4 °C with rat anti-mouse IgE (BD Biosciences, San Diego, CA). Plates were blocked for 1 hour at room temperature with 0.5% gelatin in PBS, washed in PBS containing 0.05% TWEEN*-20 (PBS-Tween), and incubated for six hours at room temperature with purified mouse IgE (BD Biosciences) as standards or with serum dilutions. Binding was detected with biotinylated anti-mouse IgE (BD Biosciences) using mouse IgG (Sigma-Aldrich, St. Louis, MO) as a blocker. Binding was detected with peroxidase-linked streptavidin (Southern Biotechnology Associates, Inc., Birmingham, AL) and SURE BLUE™ substrate (KPL Inc., Gaithersburg, MD). [0280] In order to investigate the requirement for IL-13 to support resting IgE levels in naive mice, serum was examined in the absence of specific immunization from •f wild-type mice and from mice genetically deficient in IL-13 and IL-13Ra2. Mice deficient in IL-13 had virtually undetectable levels of serum IgE. In contrast, mice lacking the inhibitory receptor IL-13Ro2 displayed elevated levels of serum IgE. These results demonstrate that blocking IL-13 can be useful for treating or preventing atopic disorders. f028n Example 7: IL-13 and Atopic Disorders [0282] The ability of MJ2-7 to inhibit the bioactivity of native human IL-13 (at 1 ng/ml) was evaluated in an assay for STAT6 phosphorylation. MJ2-7 inhibited the activity of native human IL-13 with an IC50 of about 0.293 nM in this assay. An antibody with the murine heavy chain of MJ2-7 and a humanized light chain inhibited the activity of native human IL-13 with an IC50 of about 0.554 nM in this assay. [0283] The ability of MJ2-7 to inhibit non-human primate IL-13 (at 1 ng/ml) was evaluated in an assay for CD23 expression. The MJ2-7 inhibited the activity of non-human primate IL-13 with an IC50 of about 0.242 nM in this assay. An antibody with the murine heavy chain of MJ2-7 and a humanized light chain inhibited the activity of non-human primate IL-13 with an IC50 of about 0.308 nM in this assay. [0284] Example 8: Nucleotide and amino acid sequences of mouse MJ 2-7 antibody 0285] The nucleotide sequence encoding the heavy chain variable region (with in optional leader) is as follows: 1 ATGAAATGCA GCTGGGTTAT CTTCTTCCTG ATGGCAGTGG TTACAGGGGT 51 CAATTCAGAG GTTCAGCTGC AGCAGTCTGG GGCAGAGCTT GTGAAGCCAG 101 GGGCCTCAGT CAAGTTGTCC TGCACAGGTT CTGGCTTCAA CATTAAAGAC 151 ACCTATATAC ACTGGGTGAA GCAGAGGCCT GAACAGGGCC TGGAGTGGAT 201 TGGAAGGATT GATCCTGCGA ATGATAATAT TAAATATGAC CCGAAGTTCC 251 AGGGCAAGGC CACTATAACA GCAGACACAT CCTCCAACAC AGCCTACCTA 301 CAGCTCAACA GCCTGACATC TGAGGACACT GCCGTCTATT ACTGTGCTAG 351 ATCTGAGGAA AATTGGTACG ACTTTTTTGA CTACTGGGGC CAAGGCACCA 401 CTCTCACAGT CTCCTCA (SEQ ID NO: 14*2) [0286] The amino acid sequence of the heavy chain variable region with an optional leader (underscored) is as follows: --•«-1 MKCSWVIFFL MAWTGVNSE VQLQQSGAEL VKPGASVKLS CTGSGFNIKD 51 TYIHWVKQRP EQGLEWIGRI DPANDNIKYD PKFQGKATIT ADTSSNTAYL 101 QLNSLTSEDT AVYYCARSEE NWYDFFDYWG QGTTLTVSS (SEQ ID NO:143) [0287] The nucleotide sequence encoding the light chain variable region is as follows: 1 ATGAAGTTGC CTGTTAGGCT GTTGGTGCTG ATGTTCTGGA TTCCTGCTTC 51 CAGCAGTGAT GTTTTGATGA CCCAAACTCC ACTCTCCCTG CCTGTCAGTC 101 TTGGAGATCA AGCCTCCATC TCTTGCAGGT CTAGTCAGAG CATTGTACAT 151 AGTAATGGAA ACACCTATTT AGAATGGTAC CTGCAGAAAC CAGGCCAGTC 201 TCCAAAGCTC CTGATCTACA AAGTTTCCAA CCGATTTTCT GGGGTCCCAG 251 ACAGGTTCAG TGGCAGTGGA TCAGGGACAG ATTTCACACT CAAGATTAGC 301 AGAGTGG''''AGG CTGAGGATCT GGGAGTTTAT TACTGCTTTC AAGGTTCACA 351TATTCCGTAC ACGTTCGGAG GGGGGACCAA GCTGGAAATA AAA (SEQ ID HO:144) [0288] The amino acid sequence of the light chain variable region with an optional leader (underscored) is as follows: 1 MKLPVRLLVL MFWIPASSSD VLMTQTPLSL PVSLGDQASI SCRSSQSIVH 51 SNGNTYLEWY LQKPGQSPKL LIYKVSNRFS GVPDRFSGSG SGTDFTLKIS 101 RVEAEDLGVY YCFQGSHIPY TFGGGTKLEIK (SEQ ID NO: 145) [02891 Example 9: Nucleotide and amino acid sequences of exemplary first humanized variants of the MJ 2-7 antibody [0290] Humanized antibody Version 1 (VI) is based on the closest human germline clones. The nucleotide sequence of hMJ 2-7 VI heavy chain variable region (hMJ 2-7 VH VI) (with a sequence encoding an optional leader sequence) is as follows: 1 ATGGATTGGA CCTGGCGCAT•CCTGTTCCTG GTGGCCGCTG CCACCGGCGC 51 TCACTCTCAG GTGCAGCTGG TGCAGTCTGG CGCCGAGGTG AAGAAGCCTG 101 GCGCTTCCGT GAAGGTGTCC TGTAAGGCCT CCGGCTTCAA CATCAAGGAC 151 ACCTACATCC ACTGGGTGCG GCAGGCTCCC GGCCAGCGGC TGGAGTGGAT 201 GGGCCGGATC GATCCTGCCA ACGACAACAT CAAGTACGAC CCCAAGTTTC 251 AGGGCCGCGT GACCATCACC CGCGATACCT CCGCTTCTAC CGCCTACATG 301 GAGCTGTCTA GCCTGCGGAG CGAGGATACC GCCGTGTACT ACTGCGCCCG 351 CTCCGAGGAG AACTGGTACG ACTTCTTCGA CTACTGGGGC CAGGGCACCC 401 TGGTGACCGT GTCCTCT (SEQ ID NO:146) [0291 ] The amino acid sequence of the heavy chain variable region (hMJ 2-7 VI) is based on a CDR grafted to DP- 25, VH-1,1-03. The amino acid sequence with an optional leader (first underscored region; CDRs based on AbM definition shown in subsequent underscored regions) is as follows: 1 MPWTWRILFL VAAATGAHS . Q VQLVQSGAEV KKPGASVKVS CKASGFNIKD s t TYUjw VRQAP GQRLEWMGW DPANPNIKYD PKFQGRVTIT KDTSASTAYM 101 ELSSLRSEDT AVYYCARSEE NWYPFFDYWG QGTLVTVSSG ESCR (SEQ ID NQ-.147) [0292] The nucleotide sequence of the hMJ 2-7 V1 light chain variable region (hMJ 2-7 VL VI) (with a sequence encoding an optional leader sequence) is as follows: 1 ATGCGGCTGC CCGCTCAGCT GCTGGGCCTG CTGATGCTGT GGGTGCCCGG 51 CTCTTCCGGC GACGTGGTGA TGACCCAGTC CCCTCTGTCT CTGCCCGTGA 101 CCCTGGGCCA GCCCGCTTCT ATCTCTTGCC GGTCCTCCCA GTCCATCGTG 151 CACTCCAACG GCAACACCTA CCTGGAGTGG TTTCAGCAGA GACCCGGCCA 201 GTCTCCTCGG CGGCTGATCT ACAAGGTGTC CAACCGCTTT TCCGGCGTGC 251 CCGATCGGTT CTCCGGCAGC GGCTCCGGCA CCGATTTCAC CCTGAAGATC 301 AGCCGCGTGG AGGCCGAGGA TGTGGGCGTG TACTACTGCT TCCAGGGCTC 351 CCACATCCCT TACACCTTTG GCGGCGGAAC CAAGGTGGAG ATCAAG {SEQ ID NO:143) [0293] This version is based on a CDR graft to DPK18, V kappaH. The arnino acid sequence of hMJ 2-7 VI light chain variable region (hMJ 2-7 VL VI) (with optional leader as first underscored region; CDRs based on AbM definition in subsequent underscored regions) is as follows: 1 frTRLPAOLLGLLMLWVPGSSG .DWMTQSPLS LPVTLGQPASISCRSSOSIV 51 HSNGNTYLEW FQQRPGQSPR RL1YKVSNRF SGVPDRf SGS GSGTDFTLKI 101 ''''SR.VEAEDVGV YYCFQGSHIP YTFGGGTKVE IK (SEQiDNO:i49) [02941 Example 10: Nucleotide and amino acid sequences of exemplary second humanized variants of the MJ 2-7 antibody [0295] The following heavy chain variable region is based on a CDR graft to DP-54, VH-3, 3-07. The nucleotide sequence of hMJ 2-7 Version 2 (V2) heavy chain variable region (hMJ 2-7 VH V2) (with a sequence encoding an optional leader sequence) is as follows: 1 ATGGAGCTGG GCCTGTCITG GGTGTTCCTG GTGGCTATCC TGGAGGGCGT 51 GCAGTGCGAG GTGCAGCTGG TGGAGTCTGG CGGCGGACTG GTGCAGCCTG 101 GCGGCTCTCT GCGGCTGTCTTGCGCCGCTT CCGGCTTCAA CATCAAGGAC 151 ACCTACATCC ACTGGGTGCG GCAGGCTCCC GGCAAGGGCC TGGAGTGGGT 201 GGCCCGGATC GATCCTGCCA ACGACAACAT CAAGTACGAC CCCAAGTTCC 251 AGGGCCGGTT CACCATCTCT CGCGACAACG CCAAGAACTC CCTGTACCTC 301 CAGATGAACT CTCTGCGCGC CGAGGATACC GCCGTGTACT ACTGCGCCCG 351 GAGCGAGGAG AACTGGTACG ACTTCTTCGA CTACTGGGGC CAGGGCACCC 401 TGGTGACCGT GTCCTCT (SEQIDNO:150) [0296] The amino acid sequence of hMJ 2-7 V2 heavy chain variable region (hMJ 2-7 VH V2) with an optional leader (first underscored region; CDRs based on AbM definition shown in subsequent underscored regions) is as follows: * 1 MELGLSWVFL VAILEGVOC- E VQLVESGGGL VQPGGSLRLS CAASGFNIKD 51 TYTHWVRQAP GKGLEWVARI DPANPNIKYD PKFOGRFTIS RDNAKNSLYL 101 OMNSLRAEDT AVYYCARSEE NWYDFFPYWO QGTLVTVSS (SEQIDNO.-151) --- ,^~ [0297] The hMJ 2-7 V2 light chain variable region was based on a CDR graft to DPK9, V kappal, 02. The nucleotide sequence of hMJ 2-7 V2 light chain variable region (hMJ 2-7 VL V2) (with a sequence encoding an optional leader sequence) is as follows: 1 ATGGATATGC GCGTGCCCGC TCAGCTGCTG GGCCTGCTGC TGCTGTGGCT 51 GCGCGGAGCC CGCTGCGATA TCCAGATGAC CCAGTCCCCT TCTTCTCTGT 101 CCGCCTCTGT GGGCGATCGC GTGACCATCA CCTGTCGGTC CTCCCAGTCC 151 ATCGTGCACT CCAACGGCAA CACCTACCTG GAGTGGTATC AGCAGAAGCC 201 CGGCAAGGCC CCTAAGCTGC TGATCTACAA GGTGTCCAAC CGCmTCCG 251 GCGTGCCTTC TCGGTTCTCC GGCTCCGGCT CCGGCACCGA TTTCACCCTG 301 ACCATCTCCT CCCTCCAGCC CGAGGATTTC GCCACCTACT ACTGCTTCCA 351 GGGCTCCCAC ATCCCTTACA CCTTTGGCGG CGGAACCAAG GTGGAGATCA 401 AGCGT (SEQIDNO:152) 0298] The amino acid sequence of the light chain variable region of hMJ 2-7 v^2 light chain variable region (hMJ 2-7 VL V2) (with optional leader peptide anderscored and CDRs based on AbM definition shown in subsequent underscored regions) is as follows: 1 MDMRVPAOLL GLLLLWLRGA RC -DIQMTQSP SSLSASVGDR VTITCRSSQS 51 IVHSNGNTYL EWYQQKPGKA PKLLIYKVSN RFSGVPSRFS GSGSGTDFTL 101 TISSLOPEDF ATYYCFQGSHIPYTFGGGTK VEDCR (SEQIDNO:153) Q299] Additional humanized versions of MJ 2-7 V2 heavy chain variable region were made. These versions included backmutations that have murine amino icids at selected framework positions. # ''''_0300J The nucleotide sequence encoding the heavy chain variable region ''''Version 2.1" or V2.1 with the back mutations V48I.A29G is as follows: 1 GAGGTGCAGC TGGTGGAGTC TGGCGGCGGA CTGGTGCAGC CTGGCGGCTC 51 TCTGCGGCTC TCTTGCGCCG CTTCCGGCTT CAACATCAAG GACACCTACA 101 TCCACTGGGT GCGGCAGGCT CCCGGCAAGG GCCTGGAGTG GATCGGCCGG 151 ATCGATCCTG CCAACGACAA CATCAAGTAC GACCCCAAGT TCCAGGGCCG 201 GTTCACCATC TCTCGCGACA ACGCCAAGAA CTCCCTGTAC CTCCAGATGA 251 ACTCTCTGCG CGCCGAGGAT ACCGCCGTGT ACTACTGCGC CCGGAGCGAG 301 GAGAACTGGT ACGACTTCTT CGACTACTGG GGCCAGGGCA CCCTGGTGAC 351 CGTGTCCTCT (SEQIDNO:154) [0301] The amino acid sequence of the heavy chain variable region of V2.1 (CDRs based on AbM definition shown in subsequent underscored regions) is as follows: 1 EVQLVESGGG LVQPGGSLRL SCAASGFNIK DTYIHWVROA PGKGLEWTGR 51 1DPANDN1KY DPKFOGRFT1SRDNAKNSLY IQMNSLRAKD TA WYr APSg 101 ENVVYDFFDYW GOGTLVTVSS (SEQ ID NO: 155) [0302] The nuclcotide sequence encoding the heavy chain variable region V2.2 with the back mutations (R67K;F68A) is as follows: 1 GAGGTGCAGC TGGTGGAGTC TGGCGGCGGA CTGGTGCAGC CTGGCGGCTC 51 TCTGCGGCTG TCTTGCGCCG CTTCCGGCTT CAACATCAAG GACACCTACA 101 TCCACTGGGT GCGGCAGGCT CCCGGCAAGG GCCTGGAGTG GGTGGCCCGG 151 ATCGATCCTG CCAACGACAA CATCAAGTAC GACCCCAAGT TCCAGGGCAA. 201 GGCCACCATC TCTCGCGACA ACGCCAAGAA CTCCCTGTAC CTCCAGATGA 251 ACTCTCTGCG CGCCGAGGAT ACCGCCGTGT ACTACTGCGC CCGGAGCGAG 301 GAGAACTGGT ACGACTTCTT CGACTACTGG GGCCAGGGCA CCCTGGTGAC 351 CGTGTCCTCT (SEQ ED NO: 156) 0303] The amino acid sequence of the heavy chain variable region of V2.2 CDRs based on AbM definition shown in subsequent underscored regions) is as bllows: _^^. 1 EVQLVESGGG LVQPGGSLRL SCAASGFNIK DTYIHWVRQA PGKGLEWVAR 51 IDPANDNIKY DPKFOGKATISRDNAKNSLY LQMNSLRAED TAVYYCARSE 102 ENWYDFFDYW GOGTLVTVSS (SEQIDNO:157) 0304] The nucleotide sequence encoding the heavy chain variable region V2.3 /ith the back mutations (R72A): I GAGGTGCAGC TGGTGGAGTC TGGCGGCGGA CTGGTGCAGC CTGGCGGCTC 51 TCTGCGGCTG TCTTGCGCCG CTTCCGGCTT CAACATCAAG GACACCTACA 101 TCCACTGGGT GCGGCAGGCT CCCGGCAAGG GCCTGGAGTG GGTGGCCCGG 151 ATCGATCCTG CCAACGACAA CATCAAGTAC GACCCCAAGT TCCAGGGCCG 201 GTTCACCATC TCTGCCGACA ACGCCAAGAA CTCCCTGTAC CTCCAGATGA 251 ACTCTCTGCG CGCCGAGGAT ACCGCCGTGT ACTACTGCGC CCGGAGCGAG 301 GAGAACTGGT ACGACTTCTT CGACTACTGG GGCCAGGGCA CCCTGGTGAC [0305] The amino acid sequence of the heavy chain variable region of V2.3 (CDRs based on AbM definition shown in subsequent underscored regions) is as follows: 1 EVQLVESGGG LVQPGGSLRL SCAASGFNIK DTYIHWVRQA PGKGLEWVAR 51 IDPANDNIKY DPKFQGRFTISADNAKNSLY LQMNSLRAED TAVYYCARSE 103 ENWYDFFDYW GQGTLVTVSS (SEQIDNO:159) [0306] The nucleotide sequence encoding the heavy chain variable region V2.4 with the back mutations (A49G) is as follows: 1 GAGGTGCAGC TGGTGGAGTC TGGCGGCGGA CTGGTGCAGC CTGGCGGCTC 51 TCTGCGGCTG TCTTGCGCCG CTTCCGGCTT CAACATCAAG GACACCTACA 101 TCCACTGGGT GCGGCAGGCT CCCGGCAAGG GCCTGGAGTG GGTGGGCCGG 151 ATCGATCCTG CCAACGACAA CATCAAGTAC GACCCCAAGT TCCAGGGCCG 201 GTTCACCATC TCTCGCGACA ACGCCAAGAA CTCCCTGTAC CTCCAGATGA 251 ACTCTCTGCG CGCCGAGGAT ACCGCCGTGT ACTACTGCGC CCGGAGCGAG 301 GAGAACTGGT ACGACTTCTT CGACTACTGG GGCCAGGGCA CCCTGGTGAC 351 CGTGTCCTCT (SEQIDNO:160) [0307] The amino acid sequence of the heavy chain variable region of V2.4 (CDRs based on AbM definition shown in subsequent underscored regions) is as follows: 1 EVQLVESGGG LVQPGGSLRL SCAASGFNIK DTYIHWVROA PGKGLEWVGR 51 IPPANDNTKY DPKFOGRFTI SRDNAKNSLY LQMNSLRAED TAVYYCARSE 104 ENWYDFFDYW GQGTLVTVSS (SEQ IDNO:161) [0308] The nucleotide sequence encoding the heavy chain variable region V2.5 with the back mutations (R67K;F68A;R72A) is as follows: 1 GAGGTGCAGC TGGTGGAGTC TGGCGGCGGA CTGGTGCAGC CTGGCGGCTC 51 TCTGCGGCTG TCTTGCGCCG CTTCCGGCTT CAACATCAAG GACACCTACA 101 TCCACTGGGT GCGGCAGGCT CCCGGCAAGG GCCTGGAGTG GGTGGCCCGG 151 ATCGATCCTG CCAACGACAA CATCAAGTAC GACCCCAAGT TCCAGGGCAA 201 GGCCACCATC TCTGCCGACA ACGCCAAGAA CTCCGTGTAC CTCCAGATGA 251 ACTCTCTGCG CGCCGAGGAT ACCGCCGTGT ACTACTGCGC CCGGAGCGAG 301 GAGAACTGGT ACGACTTCTT CGACTACTGG GGCCAGGGCA CCCTGGTGAC 352 CGTGTCCTCT (SEQE>NO:162) [0309] The amino acid sequence of the heavy chain variable region of V2.5 (CDRs based on AbM definition shown in subsequent underscored regions) is as follows: * 1 EVQLVESGGG LVQPGGSLRL SCAASGFNIK PTYTHWVRQA PGKGLEWVAS 51 IPPAKPNIKY PPKEOGKATl SAJDNAKNSLY LQMNSLRAED TAVYYCARSE 105 ENWYPPFPYW GQGTLVTVSS (SEQIDNO:163) [0310] The nucleotide sequence encoding the heavy chain variable region V2.6 with the back mutations (V48I; A49G;R72A) is as follows: 1 GAGGTGCAGC TGGTGGAGTC TGGCGGCGGA CTGGTGCAGC CTGGCGGCTC 51 TCTGCGGCTG TCTTGCGCCG CTTCCGGCTT CAACATCAAG GACACCTACA 101 TCCACTGGGT GCGGCAGGCT CCCGGCAAGG GCCTGGAGTG GATCGGCCGG 151 ATCGATCCTG CCAACGACAA CATCAAGTAC GACCCCAAGT TCCAGGGCCG 201 GTTCACCATC TCTGCCGACA ACGCCAAGAA CTCCCTGTAC CTCCAGATGA 251 ACTCTCTGCG CGCCGAGGAT ACCGCCGTGT ACTACTGCGC CCGGAGCGAG 301 GAGAACTGGT ACGACTTCTT CGACTACTGG GGCCAGGGCA CCCTGGTGAC 351 CGTGTCCTCT (SEQIDNO:164) [0311] The amino acid sequence of the heavy chain variable region of V2.6 (CDRs based on AbM definition shown in subsequent underscored regions) is as follows: 1 EVQLVESGGG LVQPGGSLRL SCAASGFNIK PTYIHWVRQA PGKGLEWIGg. 51 IDPANDNIKY PPKFQGRFTISADNAKNSLY LQMNSLRAED TAVYYCARSE 106 ENWYPFFDYW GQGTLVTVSS (SEQ ID NO: 165) [0312] The nucleotide sequence encoding the heavy chain variable region V2.7 with the back mutations (A49G;R72A) is as follows: 1 GAGGTGCAGC TGGTGGAGTC TGGCGGCGGA CTGGTGCAGC CTGGCGGCTC 51 TCTGCGGCTG TCTTGCGCCG CTTCCGGCTT CAACATCAAG GACACCTACA 101 TCCACTGGGT GCGGCAGGCT CCCGGCAAGG GCCTGGAGTG GGTGGGCCGG 151 ATCGATCCTG CCAACGACAA CATCAAGTAC GACCCCAAGT TCCAGGGCCG 201 GTTCACCATC TCTGCCGACA ACGCCAAGAA CTCCCTGTAC CTCCAGATGA 251 ACTCTCTGCG CGCCGAGGAT ACCGCCGTGT ACTACTGCGC CCGGAGCGAG * 301 GAGAACTGGT ACGACTTCTr CGACTACTGG GGCCAGGGCA CCCTGGTGAC 351 CGTGTCCTCT(SEQIDNO:166) [0313] Jhje_amino acid sequence of the heavy chain variable region of V2.7 (CDRs based on AbM definition shown in subsequent underscored regions) is as follows: 1 EVQLVESGGG LVQPGGSLRL SCAASGFMK DTYTHWVRQA PGKGLEWVGR 51 IDPANPNIKY DPKFOGRFTISADNAKNSLY LQMNSLRAED TAVYYCARSS 107 ENWYPFFDYW GQGTLVTVSS (SEQ ID NO:167) [0314] The nucleotide sequence encoding the heavy chain variable region V2.8 with the back mutations (L79A) is as follows: 1 GAGGTGCAGC TGGTGGAGTC TGGCGGCGGA CTGGTGCAGC CTGGCGGCTC 51 TCTGCGGCTG TCTTGCGCCG CTTCCGGCTT CAACATCAAG GACACCTACA 101 TCCACTGGGT GCGGCAGGCT CCCGGCAAGG GCCTGGAGTG GGTGGCCCGG 1SI ATCGATCCTG CCAACGACAA CATCAAGTAC GACCCCAAGT TCCAGGGCCG 201 GTTCACCATC TCTCGCGACA ACGCCAAGAA CTCCGCCTAC CTCCAGATGA 251 ACTCTCTGCG CGCCGAGGAT ACCGCCGTGT ACTACTGCGC CCGGAGCGAG 301 GAGAACTGGT ACGACTTCTT CGACTACTGG GGCCAGGGCA CCCTGGTGAC 351 CGTGTCCTCT (SEQIDNO:I68) [0315] The amino acid sequence of the heavy chain variable region of V2.8 (CDRs based on AbM definition shown in subsequent underscored regions) is as follows: I EVQLVESGGG LVQPGGSLRL SCAASGFNIK DTYIHWVROA PGKGLEWVAH 51 IDPANDNTKY DPKFQGRFTISRDNAKNSAY LQMNSLRAED TAVYYCARSE 108 ENWYPFFDYW GQGTLVTVSS (SEQIDNO:169) ''''0316] The nucleotide sequence encoding the heavy chain variable region /2.10 with the back mutations (A49G;R72A;L79A) is as follows: I GAGGTGCAGC TGGTGGAGTC TGGCGGCGGA CTGGTGCAGC CTGGCGGCTC 51 TCTGCGGCTG TCTTGCGCCG CTTCCGGCTT CAACATCAAG GACACCTACA 101 TCCACTGGGT GCGGCAGGCT CCCGGCAAGG GCCTGGAGTG GGTGGGCCGG 151 ATCGATCCTG CCAACGACAA CATCAAGTAC GACCCCAAGT TCCAGGGCCG 201 GTTCACCATC TCTGCCGACA ACGCCAAGAA CTCCGCCTAC CTCCAGATGA 251 ACTCTCTGCG CGCCGAGGAT ACCGCCGTGT ACTACTGCGC CCGGAGCGAG 301 GAGAACTGGT ACGACTTCTT CGACTACTGG GGCCAGGGCA CCCTGGTGAC 351 CGTGTCCTCT (SEQIDNO.-170) 3317] The amino acid sequence of the heavy chain variable region of V2.10 CDRs based on AbM definition shown in subsequent underscored regions) is as allows: 1 EVQLVESGGG LVQPGGSLRL SCAASGFNIK DTYIHWVROA PGKGLEWVGR 51 IPPANDMKY DPKFOGRFTISADNAKNSAY LQMNSLRAED TAVYYCARSE 109 ENWYPFFDYW GOGTLVTVSS (SEQIDNO:17J) )318] The nucleotide sequence encoding the heavy chain variable region ''''2.11 with the back mutations (V48I;A49G;R72A;L79A) is as follows: 1 GAGGTGCAGC TGGTGGAGTC TGGCGGCGGA CTGGTGCAGC CTGGCGGCTC 51 TCTGCGGCTG TC1TGCGCCG CTTCCGGCTT CAACATCAAG GACACCTACA 101 TCCACTGGGT GCGGCAGGCT CCCGGCAAGG GCCTGGAGTG GATCGGCCGG 151 ATCGATCCTG CCAACGACAA CATCAAGTAC GACCCCAAGT TCCAGGG CCG 201 GTTCACCATC TCTGCCGACA ACGCCAAGAA CTCCGCCTAC CTCCAGATGA 251 ACTCTCTGCG CGCCGAGGAT ACCGCCGTGT ACTACTGCGC CCGG AGCGAG 301 GAGAACTGGT ACGACTTCTT CGACTACTGG GGCCAGGGCA CCCTGGTGAC 351 CGTGTCCTCT (SEQtt>NO:172) [0319] The amino acid sequence of the heavy chain variable region of V2.11 (CDRs based on AbM definition shown in subsequent underscored regions) is as follows: 1 EVQLVESGGG LVQPGGSLRL SCAASGFNIK DTYIHWVROA PGKGLEWIGR 51 IPPANPNIKY PPKFOGRFTISADNAKNSAY LQMNSLRAED TAVYYCARSE 110 ENWYDFFDYW GQGTLVTVSS (SEQIDNO:173) ---»r [0320] The nucleotide sequence encoding the heavy chain variable region V2.16 with the back mutations (V48I;A49G;R72A) is as follows: 1 GAGGTGCAGC TGGTGGAGTC TGGCGGCGGA CTGGTGCAGC CTGGCGGCTC 51 TCTGCGGCTG TCTTGCACCG GCTCCGGCTT CAACATCAAG GACACCTACA 101 TCCACTGGGT GCGGCAGGCT CCCGGCAAGG GCCTGGAGTG GATCGGCCGG 151 ATCGATCCTG CCAACGACAA CATCAAGTAC GACCCCAAGT TCCAGGGCCG 201 GTTCACCATC TCTGCCGACA ACGCCAAGAA CTCCCTGTAC CTCCAGATGA 251 ACTCTCTGCG CGCCGAGGAT ACCGCCGTGT ACTACTGCGC CCGGAGCGAG 301 GAGAACTGGT ACGACTTCTT CGACTACTGG GGCCAGGGCA CCCTGGTGAC 351 CGTGTCCTCT (SEQIDNO.174) [0321] The amino acid sequence of the heavy chain variable region of V2.16 (CDRs based on AbM definition shown in subsequent underscored regions) is as follows: 1 liVQLVt-SGGG l.VQI''''t''''.GSLRL SCTGSGKNIK DTYIHWVKOA 1''''GK.GLl-WtGU 51 IDPANDNIKY DPKFOGRFTISADNAKNSLY LQMNSLRAED TAVYYCARSE 111 ENWYDFFDYW GQGTLVTVSS (SEQ ED NO: 175) [0322] The following is the amino acid sequence of a humanized MH 2-7 V2.11 IgGl with a mutated CH2 domain: EVQLVESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWIGRIDP ANDNIKYDPKFQGRFTISADNAKNSAYLQMNSLRAEDTAVYYCARSEENWYD FFDYWGQGTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTV SWNSGALTSGVHTFPAVLQSSGLYSI^SVVTVPSSSLGTQTYICNVNHKPSNTK VDKKVEPKSCDKTHTCPPCTAPEALGAPSVFLFPPKPKDTLMISRTPEVTCVVV DVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVIJIQDWLN GKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLV KGFn>SDIAVEWESNGQPEN>nrKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNV FSCSVMHEALHNHYTQKSLSLSPGK (SEQ ID NO: 176) [0323] The variable domain is at amino acids 1-120; CHI at 121-218; hinge at 219-233; CH2 at 234-343; and CH3 at 344-450. The light chain includes the following sequence with variable domain at 1-133. DIQMTQSPSSLSASVGDRVT1TCRSSQSIVHSNGNTYLEWYQQKPGKAPKLLIY KVSNRFSGWSRFSGSGSGTDFTLTISSLQPEDFATYYCFQGSHIPYTFGGGTKV EDCRTVAAPSVFIFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSG NSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFNR GEC (SEQ ID NO: 177) [03241 Example 11: Functional Assays of Exemplary Variants of MJ2-7 I [0325] We evaluated the ability of the MJ2-7 antibody and humanized variants to inhibit human DL-13 in assays for IL-13 activity. [0326] STAT6 phosphorylation assay. [0327J HT-29 human colonic epithelial cells (ATCC) were grown as an adherent monolayer in McCoy''''s 5A medium containing 10% FBS, Pen-Strep, glutamine, and sodium bicarbonate. For assay, the cells were dislodged from the flask using trypsin, washed into fresh medium, and distributed into 12x75 mm polystyrene tubes. Recombinant human IL-13 (R&D Systems, Inc.) was added at concentrations ranging from 100 - 0.01 ng/ml. For assays testing the ability of antibody to inhibit the IL-13 response, 1 ng/ml recombinant human IL-13 was added along with dilutions of antibody ranging from 500 - 0.4 ng/ml. Cells were incubated in a 37°C water bath for 30- 60 minutes, then washed into ice-cold PBS containing 1% BSA. Cells were fixed by incubating in 1% paraformaldehyde in PBS for 15 minutes at 37°C, then washed into PBS containing 1 % BSA. To permeabilize the nucleus, cells were incubated overnight at -20°C in absolute methanol. They were washed into PBS containing 1% BSA, then stained with ALEXA™ Fluor 488-labeled antibody to STAT6 (BD Biosciences). Fluorescence was analyzed with a FACSCAN™ and CELLQUEST™ • software (BD Biosciences). [0328] CD23 induction on human monocytes "~--c»r [0329] Mononuclear cells were isolated from human peripheral blood by layering over HISTOPAQUE* (Sigma). Cells were washed into RPMI containing 10% heat-inactivated FCS, 50 U/ml penicillin, 50 rag/ml streptomycin, 2 mM L-glutamine, and plated in a 48-well tissue culture plate (Costar/Corning). Recombinant human IL-13 (R&D Systems, Inc.) was added at dilutions ranging from 100 - 0.01 ng/ml. For assays testing the ability of antibody to inhibit the IL-13 response, 1 ng/ml recombinant human IL-13 was added along with dilutions of antibody ranging from 500 - 0.4 ng/ml. Cells were incubated overnight at 37°C in a 5% CC>2 incubator. The next day, cells were harvested from wells using non-enzymatic Cell Dissociation Solution (Sigma), then washed into ice-cold PBS containing 1% BSA. Cells were incubated with phycoerythrin (PE)-labeled antibody to human CD23 (BD Biosciences, San Diego, CA), and Cy-Chrome-labeled antibody to human CD1 Ib (BD Biosciences). Monocytes were gated based on high forward and side light scatter, and expression of CD1 Ib. CD23 expression on monocytes was determined by flow cytometry using a FACSCAN™ (BD Biosciences), and the percentage of CD23"*'''' cells was analyzed with CELLQUEST™ software (BD Biosciences). [0330] TF-I cell proliferation [0331 ] TF-1 cells are a factor-dependent human hemopoietic cell line requiring interlevikin 3 (1L-3) or granulocyte/macrophage colony-stimulating factor (GM-CSF) for their long-term growth. TF-1 cells also respond to a variety of other cytokines, including interleukin 13 (IL-13). TF-1 cells (ATCC) were maintained in RPMI medium containing 10% heat-inactivated FCS, 50 U/ml penicillin, SO nig/ml streptomycin, 2 mM L-glutamine, and 5 ng/ml recombinant human GM-CSF (R&D Systems). Prior to assay, cells were starved of GM-CSF overnight. For assay, TF-1 cells were plated in duplicate at 5000 cells / well in 96-well flat-bottom microtiter plates (Costar/Corning), and challenged with human IL-13 (R&D Systems), ranging from 100-0.01 ng/ml. After 72 hours in a 37 °C incubator with 5% CO2, the cells were pulsed with 1 uCi / well 3H-thymidine (Perkin Elmer / New England Nuclear). They were incubated an additional 4.5 hours, then cells were harvested onto filter mats using a TOMTEK.™ harvester. 3H-thymidine incorporation was assessed by liquid scintillation counting. [0332] Tenascin production assay [0333] BEAS-2B human bronchial epithelial cells (ATCC) were maintained BEGM media with supplements (Clonetics). Cells were plated at 20,000 per well in a 96-well flat-bottom culture plate overnight. Fresh media is added containing IL-13 in the presence or absence of the indicated antibody. After overnight incubation, the supernatants are harvested, and assayed for the presence of the extracellular matrix component, tenascin C, by ELTSA. ELISA plates are coated overnight with 1 ug/ml of murine monoclonal antibody to human tenascin (IgGl, k; Chemicon International) in PBS. Plates are washed with PBS containing 0.05% TWEEN*-20 (PBS-Tween), and blocked with PBS containing 1% BSA. Fresh blocking solution was added every 6 minutes for a total of three changes. Plates were washed 3X with PBS-Tween. Cell supernatants or human tenascin standard (Chemicon International) were added and incubated for 60 minutes at 37 °C. Plates were washed 3X with PBS-Tween. Tenascin was detected with murine monoclonal antibody to tenascin (IgG2a, k; Biohit). Binding was detected with HRP-labeled antibody to mouse IgG2a, followed by TMB substrate. The reaction was stopped with 0.01 N sulfuric acid. Absorbance was read at 450 nm. [0334] The I IT 29 human epithelial cell line can he used to assay STAT6 phosphorylation. HT 29 cells arc incubated with 1 ng/ml native human IL-13 crude preparation in the presence of increasing concentrations of the test antibody for 30 minutes at 37 °C. Western blot analysis of cell lysates with an antibody to phosphorylatcd STAT6 can be used to detect dose-dependent IL 13-mediated phosphorylation of STAT6. Similarly, flow cytometric analysis can detect phosphorylated STAT6 in HT 29 cells that were treated with a saturating concentration of IL-13 for 30 minutes at 37 °C, fixed, permeabilized, and stained with an ALEXA™ Fluor 488-labeled mAb to phospho-STAT6. An exemplary set of results is set forth in the Table 1. The inhibitory activity of V2.11 was comparable to that of sIL-l3Ra2-Fc. Table 1 (Table Remove) [0336] Example 12: Binding Interaction Site Between IL-13 and IL-13Ral (0337] A complex of IL-13, the extracellular domain of IL-13Ral (residues 27- 342 of SEQ ID NO: 125), and an antibody that binds human IL-13 was studied by x-ray crystallography. See, e.g., Ap. 16163-029001. Two points of substantial interaction were found between IL-13 and IL-13Rorl. The interaction between Ig domain 1 of IL-13 Rod and IL-13 results in the formation of an extended beta sheet spanning the two molecules. Residues Thr88 [Thrl07], Lys89 [LyslOS], Ile90 [Ilel09], and Glu91 [GJul 10] of IL-13 (SEQ ID N0:124, mature sequence [full-length sequence (SEQ ID NO: 178)]) form a beta strand that interacts with residues Lys76, Lys77, Ile78 and Ala79 of the receptor (SEQ ID NO: 125). Additionally, the side chain of Met33 [Met52] of IL-13 (SEQ ID NO:I24 [SEQ DD NO:178]) extends into a hydrophobia pocket that is created by the side chains of these adjoining strands. [0338] The predominant feature of the interaction with Ig domain 3 is the insertion of a hydrophobia residue (Phe 107 [Phel26])of IL-13 (SEQ ID NO: 124 [SEQ ID NO: 178]) into a hydrophobia pocket in Ig domain 3 of the receptor IL-13Ral. The hydrophobic pocket of IL-13Ral is formed by the side chains of residues Leu319, Cys257, Arg256, and Cys320 (SEQ ID NO: 125). The interaction with PhelO? [Phel26] of IL-13 (SEQ IDNO:124 [SEQ ID N0:178]) results in an extensive set of van der Waals interactions between amino acid residues Ile254, Ser255, Arg256, Lys318, Cys320, and Tyr321 of IL-13Ral (SEQ ID NO: 125) and amino acid residues Argl 1 [Arg30], Glul2 [GIu31], Leul3 [Leu32], He 14 [Ile33], Glul5 [Ile34], Lysl04 [Lysl23], Lysl05 [Lysl24], Leul06 [Leul25], PhelO? [Phel26], and ArglOS [Arg 127] of EL-13 (SEQ EDNO:124 [SEQ ID NO: 178]). These results demonstrate that an IL-13 binding"apht that binds to the regions of IL-13 involved in interaction with IL-13Ral can be used to inhibit IL-13 signaling. f03391 Example 13: Expression of humanized MJ 2-7 antibody in COS cells [0340] To evaluate the production of chimeric anti-NHP IL13 antibodies in the mammalian recombinant system, the variable regions of mouse MJ 2-7 antibody were subcloned into a pED6 expression vector containing human kappa and IgGlmut constant regions. Monkey kidney COS-1 cells were grown in DME media (Gibco) containing 10% heat-inactivated fetal bovine serum, 1 mM glutamine and 0.1 mg/ml Penicillin/ Streptomycin. Transfection of COS cells was performed using TRANSITIT™-LT1 Transfection reagent (Minis) according to the protocol suggested by the reagent supplier. Transfected COS cells were incubated for 24 hours at 37 °C in the presence of 10% COa, washed with sterile PBS, and then grown in serum-free media R1CD1 (Gibco) for 48 hours to allow antibody secretion and accumulation in the conditioned media. The expression of chMJ 2-7 antibody was quantified by total human IgG ELISA using purified human IgGl/kappa antibody as a standard. [0341 ] The production of chimcric MJ 2-7 antibody in COS cells was significantly lower then the control chimcric antibody (Table 2). Therefore, optimization of Ab expression was included in the MJ 2-7 humanization process. The humanized MJ 2-7 VI was constructed by CDR grafting of mouse MJ 2-7 heavy chain CDRs onto the most homologous human germline clone, DP 25, which is well expressed and represented in typical human antibody response. The CDRs of light chain were subcloned onto human germline clone DPK 18 in order to generate huMJ 2-7 VI VL. The humanized MJ 2-7 V2 was made by CDR grafting of CDRs MJ 2-7 heavy chain variable region onto DP54 human germline gene framework and CDRs of MJ 2-7 light chain variable region onto DPK9 human germline gene framework. The DP 54 clone belongs to human VH III germline subgroup and DPK9 is from the V kappa I subgroup of human germline genes. Antibody molecules that include VH III and V kappa I frameworks have high expression level in E. coli system and possess high stability and solubility in aqueous solutions (see, e.g., Stefan Ewert et al., J. Mol. Biol. (2003), 325; 531-553, Adrian Auf et al., Methods (2004) 34:215-224). We have used the combiaation of DP54/DPK9 human frameworks in the production of several recombinant antibodies and have achieved a high expression of antibody (> 20 ug/ml) in the transient COS transfection experiments. [0342] Table 2 (Table Remove) [0343] The CDR grafted MJ 2-7 VI and V2 VH and VL genes were subcloned into two mammalian expression vector systems (pED6kappa/pED6 IgGlmut and pSMEN2kappa/ pSMED2IgGlmut), and the production of humanized MJ 2-7 antibodies was evaluated in transient COS transfection experiments as described above. In the first set of the experiments the effect of various combinations of huMJ 2-7 VL and VH on the antibody expression was evaluated (Table 3). Changing of MJ 2-7 VL framework regions to DKP9 increased the antibody production 8-10 fold, whereas VL VI (CDR grafted onto DPK 18) showed only a moderate increase in antibody production. This effect was observed when humanized VL was combined with chimeric MJ 2-7 VH and humanized MJ 2-7 VI and V2. The CDR grafted MJ 2-7 V2 had a 3-fold higher expression level then CDR grafted MJ 2-7 VI in the same assay conditions. [0344J Table 3 (Table Remove) [0345] Similar experiments were performed with huMJ 2-7 V2 containing back mutations in the heavy chain variable regions (Table 4). The highest expression level was detected for huMJ 2-7 V2.11 that retained the antigen binding and neutralization properties of mouse MJ 2-7 antibody. Introduction of back mutations at the positions 48 and 49 (V48I and A49G) increased the production of huMJ 2-7 V2 antibody in COS cells, whereas the back mutations of amino acids at the positions 23, 24,67 and 68 (A23T; A24G; R67K and F68A) had a negative impact on antibody expression. (Table Remove) f 03471 Example 14: Evaluation of antigen binding properties of humanized MJ 2-7 antibodies by NHP IL-13 FLAG ELISA sap: [0348] The ability of fully humanized MJ 2-7 mAb (VI, V2 v2) to compete with biotinylated mouse MJ 2-7 Ab for binding to NHP EL-13-FLAG was evaluated by ELISA. The microtiter plates (Costar) were coated with lug/ml of anti-FLAG monoclonal antibody M2 (Sigma). The FLAG NHP IL-13 protein at concentration of 10 ng/ml was mixed with 10 ng/ml of biotin labeled mouse MJ 2-7 antibody and various concentrations of unlabeled mouse and humanized MJ 2-7 antibody. The mixture was incubated for 2 hours at room temperature and then added to the anti-FLAG antibody-coated plate. Binding of FLAG NHP-IL-13/ bioMJ2-7 Ab complexes was detected with streptavidin-HRP and S.B''''.S.S''''-tetramethylbenzidine (TMB). The humanized MJ 2-7 V2 significantly lost activity whereas huMJ 2-7 V2.11 completely restored the antigen binding activity and was capable of competing with biotinylated MJ 2-7 mAb for binding to FLAG-NHP IL-13. BIACORE™ analysis also confirmed that NHP IL-13 had rapid binding to and slow dissociation to immobilized hluMJ 2-7 v2.ll. [0349] Example 15: Molecular modeling ot Humanized tvu^-/ v/vll [0350] Structure templates for modeling humanized MJ2-7 heavy chain version 2 (MJ2-7 V2VI1) were sclectcil bused on BLAST homology searches against 1''''iotein Data Bank (PDD). Besides the two structures selected from the BLAST search output, an additional template was selected from an in-house database of protein structures. Model of MJ2-7 V2VH was built using the three template structures UPS (co-crystal structure of human tissue factor in complex with humanized Fab D3h44), 1N8Z (co-crystal structure of human Her2 in complex with Herceptin Fab) and F13.2 (IL-13 in complex with mouse antibody Fab fragment) as templates and the Homology module of Insightll (Accelrys, San Diego). The structurally conserved regions (SCRs) of UPS, 1N8Z and F13.2 (available from Ap. 16163-02900l))were determined based on the Ca distance matrix for each molecule and the template structures were superimposed based on minimum RMS deviation of corresponding atoms in SCRs. The sequence of the target protein MJ2-7 V2VH was aligned to the sequences of the superimposed templates proteins and coordinates of the SCRs were assigned to the conesponuing residues of the target protein. Based on the degree of sequence similarity between the target and the templates in each of the SCRs, coordinates from different templates were ~~—«•=: used for different SCRs. Coordinates for loops and variable regions not included in the SCRs were generated by Search Loop or Generate Loop methods as implemented in Homology module. Briefly, Search Loop method scans protein structures that would fit properly between two SCRs by comparing the Ca distance matrix of flanking SCR residues with a pre-calculated matrix derived from protein structures that have the same number of flanking residues and an intervening peptide segment of a given length. Generate Loop method that generate atom coordinates de novo was used in those cases where Search Loops did not produce desired results. Conformation of amino acid side chains was kept the same as that in the template if the amino acid residue was identical in the template and the target. However, a conformational search of rotamers was done and the energetically most favorable conformation was retained for those residues that are not identical in the template and target. This was followed by Splice Repair that sets up a molecular mechanics simulation to derive proper bond lengths and bond angles at junctions between two SCRs or between SCR and a variable region. Finally the model was subjected to energy minimization using Steepest Descents algorithm until a maximum derivative of 5 kcal/(mol A) or 500 cycles and Conjugate Gradients algorithm until a maximum derivative of 5 kcal/(mol A) or 2000 cycles. Quality of the model was evaluated using ProStat/Struct_Check command. [0351] Molecular model of mouse MJ2-7 VH was built by following the procedure described for humanized MJ2-7 V2VH except the templates used were 1QBL and 1QBM, crystal structures for horse anti-cytochrome c antibody FabES. [0352] Potential differences in CDR-Framework H-bonds predicted by the models hMJ2-7 V2VH:G26 - hMJ2-7 V2VH:A24 hMJ2-7''''V2VH:Y109 - hMJ2-7 V2VH:S25 mMJ2-7VH:D61 - mMJ2-7 VH:I48 mMJ2-7 VH:K63 - mMJ2-7 VH:E46 mMJ2~-7TH:Y109 - mMJ2-7 VH:R98 These differences suggested the following optional back mutations: A23T, A24G and V48I. [0353] Other optional back mutations suggested based on significant RMS deviation of individual amino acids and differences in amino acid residues adjacent to these are: G9A, LI 15T and R87T. [03541 Example 16: IL-13 neutralization activity of MJ2-7 and C65 [0355] The IL-13 neutralization capacities of MJ2-7 and C65 were tested in a series of bioassays. First, the ability of these antibodies to neutralize the bioactivity of NHP IL-13 was tested in a monocyte CD23 expression assay. Freshly isolated human PBMC were incubated overnight with 3 ng/ml NHP IL-13 in the presence of increasing concentrations of MJ2-7, C65, or sIL-13Ra2-Fc. Cells were harvested, stained with CYCHROME™-labeled antibody to the monocyte-specific marker, GDI Ib, and with PE-labclcd antibody to CD23. In response to 1L-13 treatment, CD23 expression is up-regulated on the surface of monocytes, which were gated based on expression of CD1 Ib. MJ2-7, C65, and sIL13Ra2-Fc all were able to neutralize the acitivity of NHP IL-13 in this assay. The potencies of MJ2-7 and sIL-l3Ra2-l;c were equivalent. C65 was approximately 20-fold less active (FIG. 2). [0356] In a second bioassay, the neutralization capacities of MJ2-7 and C65 for native human IL-13 were tested in a STAT6 phosphorylation assay. The HT-29 epithelial cell line was incubated with 0.3 ng/ml native human IL-13 in the presence of increasing concentrations of MJ2-7, C65, or sIL-13Rct2-Fc, for 30 minutes at 37 °C. Cells were fixed, permeabilized, and stained with ALEXA™ Fluor 488-labeled antibody to phosphorylated STAT6. IL-13 treatment stimulated STAT6 phosphorylation. MJ2-7, C65, and sEL13Ra2-Fc all were able to neutralize the acitivity of native human EL-13 in this assay (FIG. 3). The IC50''''s&r the murine MJ-27 antibody and the humanized form (V2.11) were 0.48 nM and 0.52 nM respectively. The potencies of MJ2-7 and sIL-13Ra2-Fc were approximately equivalent. The IC50 for sIL-13Ra2-Fc was 0.33 nM (FIG. 4). C65 was approximately 20-fold less active (FIG. 5). -^ [0357] In a third bioassay, the ability of MJ2-7 to neutralize native human IL- 13 was tested in a tenascin production assay. The human BEAS-2B lung epithelial cell line was incubated overnight with 3 ng/ml native human IL-13 in the presence of increasing concentrations of MJ2-7. Supematants were harvested and tested for production of the extracellular matrix protein, tenascin C, by ELISA (FIG. 6A). MJ2-7 inhibited this response with IC50 of approximately 0.1 nM (FIG. 6B). [0358] These results demonstrate that MJ2-7 is an effective neutralizer of both NHP IL-13 and native human IL-13. The IL-13 neutralization capacity of MJ2-7 is equivalent to that of s!L-13Ro2-Fc. MJ1-65 also has IL-13 neutralization activity, but is approximately 20-fold less potent than MJ2-7. [0359] Example 17: Epitope mapping of MJ2-7antibodv by SPR [0360] sIL-13Ra2-Fc was directly coated onto a CMS chip by standard amine coupling. NHP-IL-13 at 100 nM concentration was injected, and its binding to the immobilized EL-13Ro2-Fc was detected by BIACORE™. An additional injection of 100 nM of anti IL-13 antibodies was added, and changes in binding were monitored. MJ2-7 antibody did not bind to NHP-1L-13 when it was in a complex with hu IL-13Rct2, whereas a positive control anti-IL-13 antibody did (FIG. 7). These results indicate that hu IL-13Ra2 and MJ2-7 bind to the same or overlapping epitopes of NHP IL-13. [0361] Example 18: Measurement of kinetic rate constants for the interaction between NHP-IL-13 and humanized MJ2-7 V2-11 antibody [0362] To prepare the biosensor surface, goat anti-human IgG Fc specific antibody was immobilized onto a research-grade carboxy methyl dextran chip (CMS) using amine coupling. The surface was activated with a mixture of 0.1 M l-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) and 0.05 M N-Hydroxysuccinimide (NHS). The capturing antibody was injected at a concentration of 10 ug/ml in sodium acetate buffer (pH 5.5). Remaining activated groups were blocked with 1.0 M ethanolamine (pH 8.0). As a~c8Btrol, the first flow cell was used as a reference surface to correct for bulk refractive index, matrix effects and non-specific binding, the second, third and fourth flow cells were coated with the capturing molecule. [0363] For kinetic analysis, the monoclonal antibody KMJ2-7 V2-11 was captured onto the anti IgG antibody surface by injecting 40 ul of a 1 ug/ml solution. The net difference between the baseline and the point approximately 30 seconds after completion of injection was taken to represent the amount of target bound. Solutions of NHP-IL-13 at 600,200, 66.6,22.2, 7.4,2.5,0.8,0.27,0.09 and 0 nM concentrations were injected in triplicate at a flow rate of 100 ul per min for 2 minutes, and the amount of bound material as a function of time was recorded (FIG. 8). The dissociation phase was monitored in HBS/EP buffer (10 mM HEPES, pH 7.4, containing 150 mM NaCl, 3 mM EDTA and 0.005% (v/v) Surfactant P20) for 5 minutes at the same flow rate followed by two 5 ul injections of glycine, pH 1.5, to regenerate a fully active capturing surface. All kinetic experiments were done at 22.5°C in HBS/EP buffer. Blank and buffer effects were subtracted for each sensorgram using double referencing. [0364] The kinetic data were analyzed using BIAEVALUATION™ software 3.0.2 applied to a 1:1 model. The apparent dissociation (kd) and association (ka) rate constants were calculated from the appropriate regions of the sensorgrams using a global analysis. The affinity constant of the interaction between antibody and NHP IL-13 was calculated from the kinetic rate constants by the following formula: Kd = kd / ka. These results indicate that huMJ2-7 V2-11 has on and off-rates of 2.05xl07 NT''''s"1 and 8.89x10^ 1/s, respectively, resulting in an antibody with 43 pM affinity for NHP-IL-13. [Q36S1 Example 19: Inhibitory activity of MJ2-7 humanization intermediates in bioassays n [0366] The inhibitory activity of various intermediates in the humanization process was tested by STAT6 phosphorylation and tenascin production bioassays. A sub-maximal level of NHP IL-13 or native human IL-13 crude preparation was used to elicit the biological response, and the concentration of the humanized version of MJ2-7 ~--s»- required for half-maximal inhibition of the response was determined. Analysis hMJ2-7 VI, hMJ2-7 V2 and hMJ2-7 V3, expressed with the human IgGl, and kappa constant regions, showed that Version 2 retained neutralization activity against native human IL-13. This concentration of the Version 2 humanized antibody required for half-maximal inhibition of native human IL-13 bioactivity was approximately 110-fold greater than that of murine MJ2-7 (FIG. 9). Analysis of a semi-humanized form, in which the VI or V2 VL was combined with murine MJ2-7 VH, demonstrated that the reduction of native human IL-13 neutralization activity was not due to to the humanized VL, but rather to the VH sequence (FIG. 10). Whereas the semi-humanized MJ2-7 antibody with VL VI only partially retained the neutralization activity the version with humanized VL V2 was as active as parental mouse antibody. Therefore, a series of back-mutations were introduced into the VI VH sequence to improve the native human IL-13 neutralization activity of murine MJ2-7. [0367] Example 20: MJ2-7 blocks IL-13 interaction with IL-13Ral and IL-13Ra2 [0368] MJ2-7 is specific for the C-terminal 19-merofNHP IL-13, corresponding to amino acid residues 114 - 132 of the immature protein (SEQ FD N0:24), and residues 95 - 113 of the mature protein (SliQ ID NO: 14). For human 1L-13, this region, which forms part of the D alpha-helix of the protein, has been reported to contain residues important for binding to bothIL-13Rctl and IL-13Ro2. Analysis of human IL-13 mutants identified the A, C, and D-helices as containing important contacts site for the IL-13Ral / lL-4Ra signaling complex (Thompson and Debinski (1999) J. Biol. Chem. 274: 29944-50). Alanine scanning mutagenesis of the D-helix identified residues K123, K124, and R127 (SEQ ID N0:24) as responsible for interaction with IL-13Ra2, and residues El 10, E128, and L122 as important contacts for IL-13Rctl (Madhankmuar et al. (2002) J. Biol. Chem. 277:43194-205). High resolution solution structures of human IL-13 determined by NMR have predicted the IL-13 binding interactions based on similarities to related ligand-receptor pairs of known structure. These NMR studies have supported a keytole for the IL-13 A and D-helices in making important contacts with IL-13Ral (Eisenmesser et al. (2001)/. Mol. Biol. 310:231-241; Moy et al. (2001)/. Mol Biol. 310:219-230). Binding of MJ2-7 to this epitope located in the C-terminal, D-helix of IL-13 was predicted to disrupt interaction ofTl?T3 with IL-13Ral and IL-13Ra2. [0369] The ability of MJ2-7 to inhibit binding of NHP IL-13 to IL-13Rctl and IL-13Ra2 was tested by ELISA. Recombinant soluble forms of human IL-13Ral-Fc and IL-13Ra2-Fc were coated onto ELISA plates. FLAG-tagged NHP IL-13 was added in the presence of increasing concentrations of MJ2-7. Results showed that MJ2-7 competed with both soluble receptor forms for binding to NHP IL-13 (FIGs. 11A and 1 IB). This provides a basis for the neutralization of IL-13 bioactivity by MJ2-7. Example 21: The MJ 2-7 light chain CDRs contribute to antigen [0371 ] To evaluate if all three light chain CDR regions are required for the binding of MJ 2-7 antibody to NHP IL-13, two additional humanized versions of MJ 2-7 VL were constructed by CDR grafting. The VL version 3 was designed based on human germline clone DPK18, contained CDR1 and CDR2 of the human germline clone and CDR3 from mouse MJ2-7 antibody (FIG 12). In the second construct (hMJ 2-7 V4), only CDR1 and CDR2 of MJ 2-7 antibody were grafted onto DPK 18 framework, and CDR3 was derived from irrelevant mouse monoclonal antibody. [0372] The humanized MJ 2-7 V3 and V4 were produced in COS cells by combining hMJ 2-7 VH VI with hMJ 2-7 VL V3 and.V4. The antigen binding properties of the antibodies were examined by direct NHPIL-13 binding ELISA. The hMJ 2-7 V4 in which MJ 2-7 light chain CDR3 was absent retained the ability to bind NHP IL-13, whereas V3 that contained human germline CDR1 and CDR2 in the light chain did not bind to immobilized NHP IL-13. These results demonstrate that CDR1 and CDR2 of MJ 2-7 antibody light chain are most likely responsible for the antigen binding properties of this antibody. [0373] Nucleotide sequence of hMJ 2-7 VL V3 1 ATGCGGCTGC CCGCTCAGCT GCTGGGCCTG CTGATGCTGT GGGTGCCCGG 51 CTCTTCCGGC GACGTGGTGA TGACCCAGTC CCCTCTGTCT CTGCCCGTGA 101 CCCTGGGCCA GCCCGCTTCT ATCTCTTGCC GGTCCTCCCA GTCCCTGGTG 151 TACTCCGACG GCAACACCTA CCTGAACTGG TTCCAGCAGA GACCCGGCCA 201 GTCTCCTCGG CGGCTGATCT ACAAGGTGTC CAACCGCTTT TCCGGCGTGC 1—-=»c 251 CCGATCGGTT CTCCGGCTCC GGCAGCGGCA CCGATTTCAC CCTGAAGATC 301 AGCCGCGTGG AGGCCGAGGA TGTGGGCGTG TACTACTGCT TCCAGGGCTC 351 CCACATCCCT TACACCTTTG GCGGCGGAAC CAAGGTGGAG ATCAAG (SEQ ID NO:189) [0374] Amino acid sequence of hMJ 2-7 VLV3 MRLPAQLLGLLMLVAO''''GSSG-DWMTQSPLSLPVTLGOPASISCRSSOSLVYSDGNTYLNW FQQRPGOSPRRLIYKVSNRFSGVPDRPSGSGSGTDFTLKISRVEAEDVGVYYCFOCSHIP YTFGGGTKVEIK (SEQ ID NO: 190) [0375] Nucleotide sequence of hMJ 2-7 VL V4 GATGTTGTGATGACCCAATCTCCACTCTCCCTGCCTGTCACTCCTGGAGAGCCAGCCTCC ATCTCTTGCAGATCTAGTCAGAGCATTGTGCATAGTAATGGAAACACCTACCTGGAATGG TACCTGCAGAAACCAGGCCAGTCTCCACAGCTCCTGATCTACAAAGTTTCCAACCGATTr TCTGGGGTCCCAGACAGGTTCAGTGGCAGTGGATCAGGGACAGATTTCACACTCAAGATC AGCAGAGTGGAGGCTGAGGATGTGGGAGTTTATTACTGCTTTCAAAGTTCACATGTTCCT CTCACCTTCGGTCAGGGGACCAAGCTGGAGATCAAA (SEQ ID NO: 191) [0376] Amino acid sequence of hMJ 2-7 VL V4 DVVMTQSPLS LPVTPGliPAS 1SCKSSUS1V HSNCNTYLKW YLQKl''''OQSPQ LL1YKVSNRF SGVPDRFSGS GSGTDFTLK1SRVEAEDVGV YYCFQSSHVP I.TFGOGTKI.E IK. (SEQ ID NO: 192) [0377] Those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents of the specific embodiments described herein described herein. Other embodiments are within the following claims. CLAIMED . 1. An antibody molecule comprising a heavy chain immiuioglobulin variable domain sequence and a light chain immunoglobuiin variable domain sequence that form an antigen binding site that binds to IL-13 with a KD of less than 10" M, wherein the antibody or antigen binding fragment and has one or more of the following properties: (a) the heavy chain immunoglobuiin variable domain sequence comprises a heavy chain CDR3 that differs by fewer than 3 amino acid substitutions from a heavy chain CDR3 of mAb MJ2-7; (b) the light chain immunoglobuiin variable domain sequence comprises a light f chain CDR that differs by fewer than 3 amino acid substitutions from a corresponding light chain CDR of mAb MJ2-7; (c) the heavy chain immunoglobuiin variable domain sequence comprises a sequence encoded by a nucleic acid that hybridizes under high stringency conditions to -~«K the complement of a nucleic acid encoding a heavy chain variable domain of V2.1, V2.3, V2.4, V2.5, V2.6, V2.7, or V2.11; (d) the light chain immunoglobuiin variable domain sequence comprises a sequence encoded by a nucleic acid that hybridizes under high stringency conditions to the complement of a nucleic acid encoding a light chain variable domain of V2.11; (e) the heavy chain immunoglobuiin variable domain sequence is at least 90% identical a heavy chain variable domain of V2.1, V2.3, V2.4, V2.5, V2.6, V2.7, or V2.ll; (f) the light chain immunoglobuiin variable domain sequence is at least 90% identical a light chain variable domain of V2.11; (g) the antibody molecule competes with mAb MJ2-7 for binding to human IL-13; (h) the antibody molecule contacts one or more amino acid residues from EL-13 selected from the group consisting of residues 116, 117, 118, 122,123,124,125, 126, 127, and 128 of SEQ ID NO:24 orSEQ ID NO: 178; (i) the heavy chain variable domain sequence has the same canonical structure as mAb MJ2''''7 in hypervariable loops 1, 2 and/or 3; (j) the lignt cnam variable domain sequence has the same canonical structure as mAb MJ2-7 in hypervariable loops 1, 2 and/or 3; and (k) the heavy chain variable domain sequence and/or the light chain variable domain sequence has FR1, FR2, and FR3 framework regions from VII segments encoded by germline genes DP-54 and DPK-9 respectively or a sequence at least 95% identical to VH segments encoded by germline genes DP-54 and DPK-9; 2. The antibody molecule of claim 1 that is purified. ; 3. The antibody molecule of claim 1 that is a recombinant, IgG that includes an Fc domain. 4. The antibody molecule of claim 1 that is a Fab or scFv. 5. The antibody molecule of claim 1 that comprises framework regions that are at least 90% identical to human germline framework regions. 6. THe''''antibody molecule of claim 1 that comprises human framework regions, a human Fc region, or both. 7. The antibody molecule of claim 1, wherein the hypervariable loops of the heavy chain variable domain sequence have the same canonical structures as the hypervariable loops of mAb MJ2-7, and the heavy chain variable domain comprises at least four IL-13 contacting amino acid residues of mAb MJ2-7. 8. The antibody molecule of claim 1, wherein the frameworks of the heavy chain variable domain sequence comprise: (i) at a position corresponding to 49, Gly; • (ii) at a position corresponding to 72, Ala; (iii) at positions corresponding to 48, He, and to 49, Gly; (iv) at positions corresponding to 48, He, to 49, Gly, and to 72, Ala; (v) at positions corresponding to 67, Lys, to 68, Ala, and to 72, Ala; ind/or (vi) at positions corresponding to 48, He, to 49, Gly, to 72, Ala, to 79, Ala. 9. The antibody molecule of claim 1 that reduces the ability of IL-13 to bind to L-13Ral. 10. The antibody molecule of claim 1 that binds to IL-13 irrespective of the polymorphism present at position 130 in SEQ ID NO:24. 11. The antibody molecule of claim 1 that binds to one or both of: a peptide consisting of SEQ ID N0:l and a peptide consisting of SEQ ID NO:2. 12. The antibody molecule of claim 1, wherein the heavy chain variable domain sequence comprises: (i) G-(YF)-(NT)-I-K-D-T-Y-(MI)-H (SEQ ID NO:48), in CDR1, (ii) (WR)-I-D-P-(GA)-N-D-N-I-K-Y-(SD)-(PQ)-K-F-Q-G (SEQ ID NO:49), in CDR2, and (iii) SEENWYDFFDY (SEQ ED NO: 17), in CDR3. 13. The antibody molecule of claim 12, wherein the heavy chain variable domain sequence comprises: GFNIKDTYIH (SEQ ID NO: 15), in CDR1, RBDPANDNIKYDPKFQG (SEQ ID NO: 16), in CDR2, and SEENWYDFFDY {SEQ ID NO: 17), in CDR3, 14. The antibody molecule of claim 1, wherein the light chain variable domain sequence comprises: (i) (RK)-S-S-Q-S-(LI)-(KV)-H-S-(ND)-G-N-(TN)-Y-L-(EDNQYAS) (SEQ ID NO:25),inCDRl, (ii) K-(LVI)-S-(NY)-(RW)-(FD)-S (SEQ ID N0:27), in CDR2, and (iii) Q-(GSA)-(ST)-(HEQ)-I-P (SEQ ID N0:28), in CDR3. 15. The antibody molecule of claim 14, wherein the light chain variable domain sequence comprises: RSSQSIVHSNGNTYLE (SEQ ED NO: 18), in CDR1 K.VSNRFS (SEQ ID NO: 19), in CDR2, and FQGSHEPYT (SEQ ID NO:20), in CDR3. 16. An isolated, recombinant IgG antibody that comprises two polypeptide chains: a light ctTanTlhat includes the light chain variable domain of V2.11 and a heavy chain that includes the heavy chain variable domain of V2.1, V2.3, V2.4, V2.5, V2.6, V2.7,orV2.11. 17. The isolated, recombinant IgG antibody of claim 16 wherein the heavy chain further includes an Fc domain. 18. A pharmaceutical composition comprising the antibody molecule of claim 1 and a pharmaceuticaily acceptable carrier. 19. The pharmaceutical composition of claim 18 that is adapted for subcutaneous, inhalatory, or topical administration. 20. A nucleic acid that comprises a sequence that: (i) encodes a polypeptide that comprises a heavy chain immunoglobulin variable domain sequence that: (a) comprises a heavy CDR3 that differs by fewer than 3 iimino acid substitutions from a corresponding CDR3 of niAb MJ2-7; or (b) is at least 90% identical to a heavy chain variable domain of V2.1, V2.3, V2.4, V2.5, V2.6, V2.7, or V2.11; or (ii) hybridizes under high stringency conditions to the complement of a .ucleic acid encoding a heavy chain variable domain of V2.1, V2.3, V2.4, V2.5, V2.6, ''''2.7, or V2.11. 21. A nucleic acid that comprises a sequence that: (i) encodes a polypeptide that comprises a light chain immunoglobulin ariable domain sequence that: * (a) comprises a light chain CDR that differs by fewer than 3 amino acid substitutions from a corresponding CDR of mAb MJ2-7; or ~^5) is at least 90% identical to a light chain variable domain of V2.ll; or (ii) hybridizes under high stringency conditions to the complement of a ucleic acid encoding a light chain variable domain of V2.11. 22. A host cell comprising one or more nucleic acid sequences that encode the ntibody molecule of claim 1. 23. A method of providing a recombinant antibody, the method comprising: providing a host cell a nucleic acid sequence that encodes an antibody notecule of claim 1, and maintaining the cell under conditions in which the antibody molecule is ixpressed. 24. The method of claim 23..further comprising isolating the protein from the lost cell or media in which the host cell is maintained. 25. The method of claim 24, further comprising formulating the isolated protein as a pharmaceutical composition. 26. A method of treating an IL-13-associated disorder, the method comprising: administering, to a subject having or at risk for the disorder, an effective amount, of the antibody molecule of claim 1. 27. The method of claim 26, wherein the IL-13 associated disorder is selected from the group consisting of: asthmatic disorders, atopic disorders, chronic obstructive pulmonary disease (COPD), conditions involving airway inflammation, eosinophilia, * fibrosis and excess mucus production, inflammatory conditions, autoimmune conditions, tumors or cancers, viral infection, and suppression of expression of protective type 1 immune responses. 28. The method of claim 26, wherein the disorder is an asthmatic disorder or allergic rhinitis. 29. The method of claim 26, wherein the disorder is inflammatory bowel disease. 30. The method of claim 26, wherein the disorder is chronic obstructive pulmonary disease (COPD). 31. The method of claim 26, wherein the disorder is an atopic disorder. 32. The method of claim 26, wherein the protein is administered subcutaneously, by inhalation, or topically. 33. A method of detecting the presence of IL-13 in a sample, the method comprising: (i) contacting the sample with an anti-IL-13 antibody molecule according to claim 1; and (ii) detecting IL-13 in the sample using the anti-IL-13 antibody molecule. 34. The method of claim 33, wherein the sample is from a subject. 35. A method of treating a subject exhibiting a symptom of, asthma selected from the group consisting of wheezing, shortness of breath, bronchoconstriction, airway hyperreactivity, decreased lung capacity, fibrosis, airway inflammation, and mucus production, said method comprising the step of administering to the patient an antibody according to claim 1, wherein the antibody binds to IL-13 and interferes with the formation of a functional IL-13 signaling complex. 36. The invention substantially such as herein described