NOVEL PRODUCT AND PROCESS FOR T LYMPHOCYTE VETO

Abstract: The present invention relates to a product and process for suppressing an immune response using a T lymphocyte veto molecule capable of blocking cell surface molecules responsible for T cell activation. Disclosed is a CD4 or CD2 molecule, associated with an immunoglobulin molecule capable of binding to a major histocompatibility antigen. Also disclosed is a method to produce a T lymphocyte veto molecule, a therapeutic composition comprising a T lymphocyte veto molecule and methods to use T lymphocyte veto molecules in therapeutic processes requiring suppression of an immune response.

Description: NOVEL PRODUCT AND PROCESS FOR T LYMPHOCYTE VETO GOVERNMENT RIGHTS This invention was made in part with government support under AI35194, awarded by the National Institutes of Health. The government has certain rights to this invention. FIELD OF THE INVENTION The present invention relates to a product and process for immunosuppression of subjects having undesired immunological reactivities and in subjects in need of cell, tissue or organ transplant survival. More particularly, the present invention relates to a T lymphocyte veto molecule (hereinafter defined) and the use of such a molecule as an immunoregulator to effect therapeutic objectives. BACKGROUND OF THE INVENTION A wide variety of medical treatments require regulation of the immune response in a patient. Such treatments include, for example, vaccinations, treatments for autoimmune diseases, immunodeficiency diseases, immunoproliferative diseases and treatments involving the transplantation of organs and skin. Traditional reagents and methods used to regulate a subject's immune response often results in unwanted side effects. For example, immunosuppressive reagents such as cyclosporin A, azathioprine and prednisone are used to suppress the immune 37687 PC17US97/05943 system of a patient with an autoimmune disease or patients receiving transplants. Such reagents, however, suppress a patient's entire immune response, thereby crippling the ability of the patient to mount an immune response against infectious agents not involved in the original disease. Due to such harmful side effects and the medical importance of immune regulation, reagents and methods to regulate specific parts of the immune system have been the subject of study for many years. Introduction of an antigen into a host initiates a series of events culminating in an immune response. In addition, self-antigens can result in immunological tolerance or activation of an immune response against self-antigens. A major portion of the immune response is regulated by the interaction of a stimulator cell (defined in detail below) with a responding cell (defined in detail below) . Particular reagents having immunoregulatory potential of cell to cell interactions have been suggested by various investigators. Tykocinski et al. disclose in U.S. Patent No. 5,242,687, issued Sep. 7, 1993, a composition comprising a CD8 peptide associated with a secondary ligand, including an Fc domain of immunoglobulin or a major histocompatibility molecule (MHC). Tykocinski et al. do not teach or suggest such a composition involving CD4, CD2, C D 2 8, CTLA4 or fas-ligand proteins which are known to have significantly different functions in various immunity mechanisms. In U.S. Patent No. 5,336,603, issued Aug. 9, 1994, Capon et al. disclose "immunoadhesons" useful for immuno odulatory therapy. Capon et al. disclose adhesons as cell surface polypeptides, examples of which include CD8, CD4 and CD2, that can be combined with an immunologically active non-adheson polypeptide. Capon et al., however, do not teach or suggest a T cell veto molecule useful for immunosuppression and particularly a molecule that prevents the specific activation of responding cells by stimulator cells to suppress an immune response. As such, there remains a need for therapeutic reagents and strategies that suppress an immune response in a safe and effective manner. SUMMARY The present invention relates to a novel product and process for treatment of subjects in need of the abrogation of immunological reactivities. According to the present invention there are provided soluble or membrane-bound T lymphocyte veto molecules for immunosuppression in vivo or in vitro . The present invention overcomes traditional problems with immunoregulatory reagents by specifically regulating stimulator cell activation of responding cells capable of killing transplanted cells or capable of responding to autoantigens. This act of regulation is referred to herein as T cell veto. A molecule capable of T cell veto is referred to herein as a T cell veto molecule. In addition, the immunoregulatory reagents of the present invention can be administered locally, thereby alleviating problems that arise from extensive immunosuppression in an animal. More specifically, one embodiment of the present invention includes a T lymphocyte veto molecule which includes a chimeric molecule having a protein selected from the group consisting of CD4 protein, CD2 protein, CD28 protein, CTLA4 protein, Fas-ligand protein, CD5 protein, CD7 protein, CD9 protein, CD11 protein, CD18 protein, CD27 protein, CD43 protein, CD45 protein, CD48 protein, B7.1 protein and B7.2 protein. The protein is linked to a targeting polypeptide that binds to a molecule that differentiates a host cell from a tissue graft cell. A further embodiment of the present invention is a T lymphocyte veto molecule which includes a chimeric molecule having one of such proteins. In this embodiment, the protein is linked to a targeting polypeptide that binds to a molecule which selectively targets a stimulator cell involved in an autoimmune response. In further aspects of these embodiments, the targeting polypeptide can be an immunoglobulin molecule, a growth factor or a tissue specific antigen. Such T lymphocyte veto molecules can be included in therapeutic compositions which also include pharmaceutically acceptable carriers. A further embodiment of the present invention includes a recombinant cell, which has a first recombinant molecule having a nucleic acid molecule operatively linked to an expression vector, wherein the nucleic acid molecule has a sequence which encodes one of the proteins mentioned above. The recombinant cell further includes a second recombinant molecule having a nucleic acid molecule operatively linked to an expression vector wherein the nucleic acid molecule encodes a protein which is a targeting molecule that differentiates between a host cell and a tissue graft cell. A further aspect of the present invention includes a method for producing a T lymphocyte veto molecule. This method includes providing a first protein as mentioned above, providing a second protein which is a targeting molecule that differentiates a host cell from a tissue graft cell, and linking the first protein to the second protein to form a chimeric molecule. The present invention also includes a method to suppress an immune response which includes exposing chimeric molecules of the present invention to a stimulator cell that can interact specifically with the chimeric molecule under conditions for reduction of an immune response. A further aspect of the present invention is a method to alleviate tissue transplant rejection. This method includes administering to an animal an effective amount of a therapeutic composition which includes a T lymphocyte veto molecule of the present invention. BRIEF DESCRIPTION OF THE FIGURES Fig. 1 shows the results of an experiment in which a T lymphocyte veto molecule is capable of specifically inhibiting the proliferation of CD4+ responder T cells. Fig. 2 shows the results of an experiment in which a T lymphocyte veto molecule of the present invention is capable of specifically inhibiting the production of IL-2 and IL-4 by CD4+ responder T cells. DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a therapeutic reagent and process for treatment of subjects in need of the abrogation of immunological reactivities. The reagents and processes of the present invention are applicable to, but not limited to, the clinical settings of transplantation and autoimmunity, allergic disorders and other immunological disorders. Embodiments of the present invention include a novel T lymphocyte veto (TLV) molecule, also referred to herein as a T cell veto molecule, that regulates the activation of a responding cell by a stimulator cell, thereby suppressing an immune response. In a particular embodiment, a T cell veto molecule of the present invention is capable of specifically regulating the activation of one type of responding cell without regulating or affecting the activation of other types of responding cells. As used herein, a stimulator cell includes any cell that, under appropriate conditions, binds to a responding cell in such a manner that the responding cell is either activated, anergized or killed. Traditional stimulator cells include "professional" antigen presenting cells (APC; e.g., dendritic cells, macrophages and B cells). According to the present invention, stimulator cells can also include a cell having a T cell veto molecule of the present invention on its surface by, for example, a tissue graft cell-specific antibody. A stimulator cell can also include a tissue graft cell, including allogeneic and xenogeneic tissue graft cells. Such graft cells can include, for example, T lymphocyte (also referred to herein as a T cell) . A responding cell includes any cell capable of being activated by a stimulator cell. Traditional responding cells include CD4-CD8+ (CD8+) , CD4+CD8+, CD4-CD8-, CD4+CD8- (CD4+) , β and yδ T cells. According to the present invention, responding cells can also include B lymphocytes (also referred to herein as B cells) , as well as "naive" or "precursor" T cells. As used herein, a "naive" T cell refers to a T cell that is not activated by a T cell veto molecule of the present invention when tested using a standard effector T cell assay, such as by cytotoxic T cell (CTL) assays, T cell proliferation assays, interleukin secretion assays and assays measuring cell death (e.g., apoptosis assays) . Preferably, a responding cell of the present invention includes a T cell, in particular a naive CD4+ or CD8+ T cell. Activation of a responding cell refers to induction of signal transduction pathways in the responding cell resulting in production of cellular products (e.g., interleukin-2) by that cell. Anergy refers to the diminished reactivity by a responding cell. Embodiments of the present invention include a novel T cell veto molecule having at least two components: (1) a responding cell activating protein (RCA protein; as defined below) ; and (2) a stimulator cell marker molecule (SCM molecule; as defined below) that differentiates a stimulator cell from a responding cell, in one embodiment, a host cell from a tissue graft cell. As used herein, the term "targeting polypeptide" is synonymous with the term SCM molecule. The two components of a T cell veto molecule of the present invention are associated with each other, such as by being linked by chemical or peptide binds (described in detail below) . As noted, a T cell veto molecule of the present invention comprises an RCA protein an SCM molecule. It should be noted that reference herein to an RCA protein, an S CM molecule or specific embodiments thereof, such as a CD4 protein in the case of an RCA protein, refers to the full length protein or molecule as well as a portion of a protein or molecule (e.g., non-protein with similar binding characteristics) that is at least sufficient to have the functional aspects of the referenced protein or molecule. Therefore, such a reference can refer to a full-length or partial polypeptide sequence that is capable of performing a desired function. For example, reference to a "CD4 protein" includes any portion of a CD4 molecule that is capable of binding to a CD4 co-receptor under conditions in which a complete CD4 protein binds to a co-receptor, and is capable of being linked to an SCM molecule. Similarly, a "CD2 protein" includes any portion of a CD2 molecule that is capable of binding to a CD2 co-receptor under conditions in which a complete CD2 protein binds to a co-receptor, and is capable of being linked to an SCM molecule. In addition, an SCM molecule includes any portion of a specific SCM molecule that is capable of binding to a molecule on the surface of a cell under conditions in which a complete SCM molecule would bind to a molecule on the surface of a cell, and is capable of being linked to an RCA protein of the present invention. An RCA protein and an SCM molecule useful for the present invention is derived from an animal including, but not limited to, a human, a non-human primate, a pig, a mouse, a rat, a hamster, a rabbit, a horse and a goat, and preferably a human, a baboon and a pig. A suitable RCA protein of the present invention comprises a protein that is capable of interfacing with a stimulator cell activating a responding cell in such manner that the action of the responding cell is altered. The resulting action of the responding cell can be inability of the responding cell to bind to a stimulator cell, apoptosis or anergy. According to the present invention, an RCA protein is preferably able to regulate the activity of a T lymphocyte, more preferably a cytotoxic and helper T lymphocyte. In a further embodiment, an RCA protein is able to regulate the activity of a specific type of responder cell without regulating the activity of another type of responder cell. In a preferred embodiment, an RCA protein is able to regulate the activity of a CD4 + T cell without regulating the activity of a CD8 + T cell. One embodiment of a responding cell activation protein of the present invention comprises a CD4 protein having one variable (V) and one constant (C2) domain. A CD4 protein of the present invention preferably comprises first and second V domains and first and second C2 domains of CD4. A CD4 protein of the present invention more preferably comprises the amino acid sequence extending from about residue 1 to about residue 203 of a processed human CD4 , in which the initiating Met is residue l. For human CD4 coding sequence, see Parnes, 1989, Adv . Immunol . 44: 2 6 5-311; Genbank M12807; and Swissprot P01730. A CD4 protein of the present invention even more preferably comprises the amino acid sequence disclosed in SEQ ID NO:l and a leader sequence. A preferred leader sequence to be used with a CD4 protein of the present invention is disclosed in SEQ ID NO:29. According to the present invention, a leader sequence is an amino acid sequence that naturally occurs at the amino terminus of a protein and functions to target the protein to a membrane for secretion. A leader sequence of the present invention can also be synthesized or isolated independently of the amino acid sequence with which the leader sequence naturally occurs. It should be noted that leader sequences of the present invention can be used with the protein with which the leader sequence naturally occurs (for example, a CD4 leader sequence with a CD4 protein) , or can be interchanged with another leader sequence, including any of the leader sequences presented herein or other known leader sequences as will be known to those skilled in the art. It should also be noted that leader sequences of the present invention can be inserted anywhere into the amino acid sequences of RCA proteins of the present invention, provided that the functions of the leader sequence and the RCA are preserved. Another embodiment of a responding cell activation protein of the present invention includes a CD2 protein having one extracellular domain of CD2 protein. A CD2 protein of the present invention preferably comprises the amino acid sequence extending from about residue 1 to about residue 208 of CD2 protein, in which the initiating Met is residue 1. For human CD2 coding sequence, see Moingean et al., 1989, JmmujioL. .Rev. Ill: 111-144; Genbank M16445; and Swissprot P06729. A CD2 protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:2 and a leader sequence. A preferred leader sequence to be used with a CD2 protein of the present invention is disclosed in SEQ ID NO:30. Another embodiment of a responding cell activation protein of the present invention includes a CD28 protein having a homodimer of the pseudo-V-region of CD28 protein. A CD28 protein of the present invention preferably comprises the amino acid sequence extending from about residue 1 to about residue 161 of CD28 protein, in which the initiating Met is residue 1. For human CD28 coding sequence, see Aruffo et al., 1987, Proc . Nat . Acad . Sci . USA 84: 8573-8577; Genbank J02988; and Swissprot P10747. A CD28 protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:3 and a leader sequence. A preferred leader sequence to be used with a CD28 protein of the present invention is disclosed in SEQ ID NO:31. Another embodiment of a responding cell activation protein of the present invention includes a cytotoxic T cell antigen 4 (CTLA4) protein having a homodimer of the pseudo V region of CTLA4 protein. A CTLA4 protein of the present invention preferably comprises the amino acid sequence extending from about residue 1 to about residue 161 of CTLA4 protein, in which the initiating Met is residue 1. For human CTLA4 coding sequence, see Danavach et al., 1988, Eur. J. Immunol . 18: 1901-1905; Genbank X15070; and Swissprot P16410. A CTLA4 protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:4 and a leader sequence. A preferred leader sequence to be used with a CTLA4 protein of the present invention is disclosed in SEQ ID NO:32. Another embodiment of a responding cell activation protein of the present invention includes a fas-ligand protein having the extracellular domain of fas-ligand protein. A fas-ligand protein of the present invention preferably comprises the amino acid sequence extending from about residue 137 to about residue 283 of fas-ligand protein, in which the initiating Met is residue 1. For human fas-ligand coding sequence, see Takahashi et al., 1994, Intern . Immunol . 6: 1567-1574. A fas-ligand protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:5 and a leader sequence. An acceptable leader sequence to be used with a Fas-ligand protein of the present invention is disclosed, for example, in SEQ ID NO:29. Another embodiment of a responding cell activation protein of the present invention includes a CD5 protein having the domains l through 3 of CD5 protein. A CD5 protein of the present invention preferably comprises the amino acid sequence extending from about residue 1 to about residue 372 of CD5 protein, in which the initiating Met is residue 1. For human CD5 coding sequence, see Jones et al., 1986, Nature 323: 346-349. A CD5 protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:6 and a leader sequence. A preferred leader sequence to be used with a CD5 protein of the present invention is disclosed in SEQ ID NO:33. Another embodiment of a responding cell activation protein of the present invention includes a CD7 protein having the pseudo V region of CD7 protein. A CD7 protein of the present invention preferably comprises the amino acid sequence extending from about residue 1 to about residue 180 of CD7 protein, in which the initiating Met is residue 1. For human CD7 coding sequence, see Aruffo et al., 1987, EMBO J. 6: 3313-3316; Genbank X06180; and Swissprot P09564. A CD7 protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:7 and a leader sequence. A preferred leader sequence to be used with a CD7 protein of the present invention is disclosed in SEQ ID NO:34. Another embodiment of a responding cell activation protein of the present invention includes a CD9 protein having the extracellular domain of CD9 protein. A CD9 protein of the present invention preferably comprises the amino acid sequence extending from about residue 113 to about residue 192 of CD9 protein, in which the initiating Met is residue l. For human CD9 coding sequence, see Boucheix et al., 1990, J. Biol . Chem. 266: 117-122; Genbank M38690; and Swissprot P21926. A CD9 protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:8 and a leader sequence. An acceptable leader sequence to be used with a CD9 protein of the present invention is disclosed, for example, in SEQ ID NO:29. Another embodiment of a responding cell activation protein of the present invention includes a CDll protein having the CDll alpha extracellular domain complexed with the CD18 extracellular domain of the CDll protein. A CDll alpha protein of the present invention preferably comprises the amino acid sequence extending from about residue 1 to about residue 1089 of CDll alpha protein, in which the initiating Met is residue 1. For human CDll alpha coding sequence, see Larson et al., 1990, Immunol . Rev . 114: 181-217; Genbank Y00796; and Swissprot P20701. A CDll protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:9 and a leader sequence. A preferred leader sequence to be used with a CDll protein of the present invention is disclosed in SEQ ID NO:35. Another embodiment of a responding cell activation protein of the present invention includes a CD18 protein having the extracellular domain of CD18 protein. A CD18 protein of the present invention preferably comprises the amino acid sequence extending from about residue 1 to about residue 750 of CD18 protein, in which the initiating Met is residue 1. For human CD18 coding sequence, see Larson et al., 1990, Immunol . Rev. 114: 181-217; Genbank Y00057; and Swissprot P05107. A CD18 protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:10 and a leader sequence. A preferred leader sequence to be used with a CD18 protein of the present invention is disclosed in SEQ ID NO:36. Another embodiment of a responding cell activation protein of the present invention includes a CD27 protein having the extracellular domain of CD27 protein. A CD27 protein of the present invention preferably comprises the amino acid sequence extending from about residue 1 to about residue 191 of CD27 protein, in which the initiating Met is residue 1. For human CD27 coding sequence, see Camerinin et al., 1991, J . Immunol . 147: 3165-3169; Genbank M62928. A CD27 protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:11 and a leader sequence. A preferred leader sequence to be used with a CD27 protein of the present invention is disclosed in SEQ ID NO:37. Another embodiment of a responding cell activation protein of the present invention includes a CD43 protein having the extracellular domain of CD43 protein. A CD43 protein of the present invention preferably comprises the amino acid sequence extending from about residue 1 to about residue 384 of CD 3 protein, in which the initiating Met is resi d ue 1 . For human CD43 coding sequence, see Pallant et al., 1989, Proc. Nat . Acad. Sci . USA 86: 1328-1332; Genbank J04168; and Swissprot 16150. A CD43 protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:12 and a leader sequence. A preferred leader sequence to be used with a CD43 protein of the present invention is disclosed in SEQ ID NO:38. Another embodiment of a responding cell activation protein of the present invention includes a CD45 protein comprising an extracellular domain of an isoform of a CD45 protein. A CD45 protein of the present invention preferably comprises the amino acid sequence extending from about residue 1 to about residue 556 of CD45 protein, in which the initiating Met is residue 1. For human CD45 coding sequence, see Streuli et al., 1987, J.Exp. Med . 166: 1548-1566; Genbank Y00638; and Swissprot P08575. According to the present invention, an isoform of a CD45 protein is any CD45 protein that is formed by the alternative splicing of exons A, B, and C of CD45; such isoforms are well known to those skilled in the art. CD45 isoforms of the present invention include an isoform in which none of the exons are spliced out, an isoform in which all of the exons are spliced out, an isoform in which any one of exons A, B, or C is spliced out, and an isoform in which any combination of exons A, B, and C are spliced out. A CD45 protein of the present invention more preferably comprises any isoform of the amino acid sequence disclosed in SEQ ID NO:13 and a leader sequence. A preferred leader sequence to be used with a CD45 protein of the present invention is disclosed in SEQ ID NO:39. Another embodiment of a responding cell activation protein of the present invention includes a CD48 protein having a pseudovariable and a pseudoconstant extracellular domains of CD48 protein. A CD48 protein of the present invention preferably comprises the amino acid sequence extending from about residue 1 to about residue 220 of CD48 protein, in which the initiating Met is residue 1. For human CD48 coding sequence, see Killeen et al., 1988, EMBO J . 7: 3087-3091; Genbank X06341, M37766, M59904; and Swissprot P09326. A CD48 protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:14 and a leader sequence. A preferred leader sequence to be used with a CD48 protein of the present invention is disclosed in SEQ ID NO:40. Another embodiment of a responding cell activation protein of the present invention includes a B7.l protein having a pseudovariable and a pseudoconstant extracellular domain of B7.1 protein. A B7.1 protein of the present invention preferably comprises the amino acid sequence extending from about residue 1 to about residue 242 of B7.1 protein, in which the initiating Met is residue 1. For human B7.1 coding sequence, see Freeman et al., 1989, J. Immunol . 143: 2714-2722; Genbank M27533. A B7.1 protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:15 and a leader sequence. A preferred leader sequence to be used with a B7.1 protein of the present invention is disclosed in SEQ ID NO:41. Another embodiment of a responding cell activation protein of the present invention includes a B7.2 protein having an extracellular domain of B7.2 protein. A B7.2 protein of the present invention preferably comprises the amino acid sequence extending from about residue 1 to about residue 74 of B7.2 protein, in which the initiating Met is residue 1. For human B7.2 coding sequence, see Kubota et al., 1990, J. Immunol . 145, 3924-3931; Genbank M55561. A B7.2 protein of the present invention more preferably comprises the amino acid sequence disclosed in SEQ ID NO:16 and a leader sequence. An acceptable leader sequence to be used with a B7.2 protein of the present invention is disclosed, for example, in SEQ ID NO:29. It is within the scope of the present invention that an RCA protein can be a portion of CD8 comprising a peptide that is capable of binding to a MHC Class I molecule in such a manner that cytotoxic T cell activity is regulated. According to the present invention, at least a portion of an RCA protein of the present invention can be linked to at least a portion of an immunoglobulin (Ig) molecule to form an RCA:Ig chimeric molecule. An RCA protein is preferably linked to an Ig molecule by a peptide bond, which refers to the covalent chemical interaction between two amino acids. A preferred portion of an Ig molecule to link to an RCA protein includes the constant region of an immunoglobulin molecule. Suitable C L and C H regions for use with an RCA:Ig chimeric molecule of the present invention include K, λ, μ, γl, γ2, γ2a, γ2b, γ3, γ4, α, l, 2, σ and ε constant regions, with human K, λ, μ, γl, γ2, γ3, γ4, αl, α2, σ and ε constant regions being more preferred and human IgG2a being even more preferred. Any constant region of any antibody is suitable for use with the present invention. A preferred portion of a constant region to use includes at least one amino acid that enables an RCA:Ig molecule to be di-sulfide bonded to an SCM molecule of the present invention. In a preferred embodiment, an RCA:Ig chimeric molecule of the present invention comprises a CD4:lg chimeric molecule having the amino acid sequence disclosed in SEQ ID NO:17 and a leader sequence. A preferred leader sequence to be used with a CD4:Ig protein of the present invention is disclosed in SEQ ID NO:29. In another preferred embodiment, an RCA:Ig chimeric molecule of the present invention comprises a CD2:Ig chimeric molecule having the amino acid sequence disclosed in SEQ ID NO:18 and a leader sequence. A preferred leader sequence to be used with a CD2:Ig protein of the present invention is disclosed in SEQ ID NO:30. In another preferred embodiment, an RCA:Ig molecule of the present invention comprises a CD28:Ig chimeric molecule having the amino acid sequence disclosed in SEQ ID NO:19 and a leader sequence. A preferred leader sequence to be used with a CD28:Ig protein of the present invention is disclosed in SEQ ID NO:31. In another preferred embodiment, an RCA:Ig chimeric molecule of the present invention comprises a CTLA4:Ig molecule having the amino acid sequence disclosed in SEQ ID NO:20 and a leader sequence. A preferred leader sequence to be used with a CTLA4:Ig protein of the present invention is disclosed in SEQ ID NO:32. In another preferred embodiment, an RCA:Ig chimeric molecule of the present invention comprises a fas-ligand:Ig chimeric molecule having the amino aid sequence disclosed in SEQ ID NO:21 and a leader sequence. An acceptable leader sequence to be used with a Fas-ligand:Ig protein of the present invention is disclosed, for example, in SEQ ID NO:29. One embodiment of a stimulator cell marker (SCM) molecule of the present invention includes a molecule capable of targeting an RCA protein of the present invention to a desired cell. In particular, an SCM molecule of the present invention includes, but is not limited to an immunoglobulin molecule (an antibody) , a growth factor or a tissue-specific antigen. A suitable antibody for use as an SCM molecule of the present invention binds to a protein on the surface of a stimulator cell of the present invention. A preferred antibody of the present invention binds to a protein on the surface of a tissue graft cell or a cell involved in an autoimmune response. A more preferred antibody of the present invention binds to a major histocompatibility molecule (MHC) , including Class I and Class II, or an organ-specific molecule, such as molecules expressed on the surface of kidney cells (e.g., sodium-potassium-chloride cotransporters; see Herbert et al., 1994, Clin . Invest . 72: 692-694), liver cells (e.g., asialoglycoprotein receptor; see Merwin et al., 1994, Bioconjugate Chem . 5: 612-620; bile acid receptors; see Krmaer et al., 1992; J. Bio . Chem . 267: 18598-18604; LMA surface target molecules; see Stemerowicz et al., 1990, J. Clin . Lab. Immunol . 32: 13-19); heart cells (e.g. , heart specific auto-antibodies; see Neumann, et al., 1992, J . Immunol . 148: 3806-3813; Traystman et al., 1991, Clin . Exp. Immunol . 86: 291-298); pancreas cells or bone marrow cells (e.g., c-kit receptor; see Okayama et al., 1994, J . Immunol . Meth . 169: 153-161; Bridell et al., 1992, Blood 79: 3159-3167. In a preferred embodiment, an antibody useful as an SCM molecule of the present invention includes the immunoglobulin molecules WFL4F12.3, FL3C6.1, BB7.2, PA2.1, 2.28M1, MA2.1, GAP A3, A11.1M, 4D12, BB7.1, B27M1, ME1, BB7.6, MB40.2, MB40.2, B27M2, SFR8-B6, Genox 3.53, G2a.5 and SFR3-DR5 (each described in ATCC Catalogue of Cell Lines and Hybridomas, 7th Edition, 1992 American Type Culture Collection) . It is within the scope of the present invention that an antibody can include a full-length antibody, an Fab fragment, an F(ab') 2 fragment or an F v fragment of an antibody. An Fab fragment comprises one arm of an immunoglobulin molecule containing a light chain (V L region + C L region) paired with the heavy chain variable region (V H region) and a portion of a heavy chain constant region (C H region) CHI domain. An F(ab') 2 fragment corresponds to two di-sulfide bonded arms of an immunoglobulin molecule, each arm containing a L chain (V L region + C L region) paired with a V H region and a CHI domain. An F v fragment refers to a portion of an immunoglobulin molecule V L region paired with a V H region. Thus, an antibody of the present invention can include the variable (V) , diversity (D) and junction (J) regions, the V,D, J and CHI regions or the full-length protein of any preferred antibody described herein. A suitable growth factor for use as an SCM molecule of the present invention binds to a receptor on the surface of a stimulator cell of the present invention. A preferred growth factor of the present invention binds to a receptor on the surface of a tissue graft cell or a cell involved in an autoimmune response. A more preferred growth factor of the present invention includes, but is not limited to thyroid stimulating hormone (TSH) , vasopressin or corticotropin. A suitable growth factor for use as an SCM molecule of the present invention binds to a tissue-specific marker on the surface of a stimulator cell of the present invention. A preferred SCM molecule of the present invention binds to a tissue specific marker on the surface of a tissue graft cell or a cell involved in an autoimmune response. A more preferred SCM molecule of the present invention includes, but is not limited to asialoglycoprotein receptor, (TSH) receptor, vasopressin receptor or corticotropin receptor. According to the present invention, an RCA protein or an SCM molecule can comprise a derivative of an RCA protein or an SCM molecule. In accordance with the present invention, a "derivative" refers to any compound that is able to mimic the ability of a component of an RCA protein or an SCM molecule of the present invention. A derivative of an RCA protein or an SCM molecule can be an amino acid sequence that has been modified to decrease its susceptibility to degradation but that still retains binding activity. Other examples of derivatives include, but are not limited to, protein-based compounds, carbohydrate-based compounds, lipid-based compounds, nucleic acid-based compounds, natural organic compounds, synthetically derived organic compounds, anti-idiotypic antibodies and/or catalytic antibodies, or fragments thereof having desired T cell regulatory activity. A derivative can be obtained by, for example, screening libraries of natural and synthetic compounds for compounds capable of binding to a CD4 or CD2 co-receptor or an MHC antigen, as disclosed herein. A derivative of a CD4, CD2 or immunoglobulin molecule can also be obtained by, for example, rational drug design. In a rational drug design procedure, the three-dimensional structure of a compound of the present invention can be analyzed by, for example, nuclear magnetic resonance (NMR) or x-ray crystallography. The three-dimensional structure can then be used to predict structures of potential derivatives by, for example, computer modeling. The predicted derivative structures can then be produced by, for example, chemical synthesis, recombinant DNA technology, or by isolating a mimetope from a natural source (e.g., plants, animals, bacteria and fungi) . In particular, a derivative of an RCA protein or an SCM molecule can include amino acid substitution or insertion mutants into which an amino acid has been substituted or inserted, the amino acid being capable of forming a di-sulfide bond with another amino acid (e.g., a cysteine or a proline) . An RCA protein or an SCM molecule of the present invention can be soluble or membrane-bound. Amino acid sequences can be genetically engineered to create soluble forms by introducing a translational stop codon into the coding sequences of an RCA protein or an SCM molecule, upstream of the cytoplasmic domains and/or the hydrophobic transmembrane domains, using technologies known to those of skill in the art (e.g., site-directed mutagenesis or PCR modification) . An example of a soluble CD4 molecule includes SEQ ID NO:17. An example of a soluble CD2 molecule includes SEQ ID NO:18. The resulting truncated CD4-or CD2- encoding nucleic acid molecules can be operatively linked to an expression vector containing one or more transcription or translation control regions to form a recombinant molecule, and the recombinant molecules can be expressed in a host cell. Amino acid sequences can be genetically engineered to create membrane-bound forms by linking, or retaining the linkage of, the amino acid sequences of an RCA protein or an SCM molecule to amino acid sequences for transmembrane domains and/or amino acid sequences for cytoplasmic domains. Preferably, a membrane-form of an RCA protein or an SCM molecule of the present invention is designed such that the molecule can be inserted into the plasma membrane of a cell and remain associated with the membrane over time. An embodiment of a plasma membrane-bound form of an RCA protein or an SCM molecule preferably comprises a full-length transmembrane domain and cytoplasmic domain of an RCA protein or an SCM molecule. Such membrane-bound forms can be produced by operatively linking nucleic acid molecules encoding full-length RCA protein or SCM molecule to an expression vector containing one or more transcription or translation control regions to form a recombinant molecule, and expressing the recombinant molecules in a host cell. Alternatively, an RCA protein or an SC M molecule can be designed such that the molecule can be anchored in a lipid bilayer when incorporated into lipid-containing substrates by being added exogenously. As used herein, the term "anchoring" refers to the insertion of a molecule in a lipid-containing substrate such that any extracellular domains are on the outside of the substrate. In one embodiment, an RCA protein or an SCM molecule of the present invention is produced by culturing a cell transformed with a recombinant molecule comprising a nucleic acid molecule operatively linked to an expression vector, in which the nucleic acid molecule comprises a nucleic acid sequence encoding an RCA protein or an SCM molecule. A recombinant molecule of the present invention comprises a nucleic acid molecule, encoding an RCA protein or an SCM molecule of the present invention, operatively linked to a vector capable of being expressed in a host cell. As used herein, "operatively linked" refers to insertion of a nucleic acid sequence into an expression vector in such a manner that the sequence is capable of being expressed when transformed into a host cell. As used herein, an "expression vector" is an RNA or DNA vector capable of transforming a host cell and effecting expression of an appropriate nucleic acid sequence, preferably replicating within the host cell. An expression vector can be either prokaryotic or eukaryotic, and typically is a virus or a plasmid. Construction of desired expression vectors can be performed by methods known to those skilled in the art and expression can be in eukaryotic or prokaryotic systems. Procaryotic systems typically used are bacterial strains including, but not limited to various strains of E. coli , various strains of bacilli or various species of Pseudomonas . In prokaryotic systems, plasmids are used that contain replication sites and control sequences derived from a species suitable for use with a host cell. Control sequences can include, but are not limited to promoters, operators, enhancers, ribosome binding sites, and Shine-Dalgarno sequences. Expression systems useful in eukaryotic host cells comprise promoters derived from appropriate eukaryotic genes. Useful mammalian promoters include early and late promoters from SV40 or other viral promoters such as those derived from baculovirus, polyoma virus, adenovirus, bovine papilloma virus or avian sarcoma virus. Expression vectors of the present invention include any vectors that function (i.e., direct gene expression) in recombinant cells of the present invention including bacterial, yeast, other fungal, insect and mammalian cells. Preferred expression vectors of the present invention include vectors containing immunoglobulin H chain promoters and/or L chain promoters. In particular, an expression vector of the present invention includes a polyhedrin promotor for CD4 or CD2 for use in a baculovirus expression system or a CMV immediate early promotor or a RSV-LTR promotor for use in a eukaryotic cell system. Useful mammalian enhancers include immunoglobulin H chain enhancers and/or L chain enhancers. Particularly preferred expression vectors for use with the present invention include baculovirus transfer vectors pVL1393, pAcUwδl or pAcAB3. In a preferred embodiment, an expression vector of the present invention comprises pVLCD2-IgG2a or pVLCD4-IgG2a. An expression system can be constructed from any of the foregoing control elements operatively linked to the nucleic acid sequences of the present invention using methods known to those of skill in the art (see, for example, Sambrook et al. , ibid. ) . Host cells of the present invention can be cells naturally capable of producing an RCA protein or an SCM molecule, or cells that are capable of producing an RCA protein or an SCM molecule when transfected with a nucleic acid molecule encoding such molecules. Host cells of the present invention include, but are not limited to bacterial, fungal, insect and mammalian cells. Suitable host cells include mammalian cell, preferably a fibroblast, a pluripotent progenitor cell, an epithelial cell, a neural cell, a T cell line and a B cell line. In one embodiment, a host cell is transformed with: (l) a first recombinant molecule comprising a nucleic acid molecule operatively linked to an expression vector, the nucleic acid molecule having a sequence encoding a first protein including an RCA protein, particularly CD4, CD2, CD28, CTL4A, fas-ligand, CD5, CD7, CD9, CDll, CD18, CD27 , CD43, CD45, CD48, B7.1 and B7.2, and even more particularly CD4, CD2, CD28, CTL4A, fas-ligand; and (2) a second recombinant molecule comprising a nucleic acid molecule operatively linked to an expression vector, the nucleic acid molecule having a sequence encoding a second protein comprising a stimulatory cell marker molecule that differentiates a host cell from a tissue graft cell to form a recombinant cell. Transformed recombinant cells of the present invention are cultured under conditions effective to produce such an RCA protein and SCM molecule. The protein and molecule can then be recovered from the culture medium and/or the cells. Effective conditions to produce an RCA or SCM molecule include, but are not limited to appropriate culture media, cell density, temperature, pH and oxygen conditions. One of skill in the art can choose appropriate culture conditions based on the type of cell being cultured and the amount of protein one desires to produce. Depending on the expression vector used for production, resultant molecules can either remain within the recombinant cell, be retained on the outer surface of the recombinant cell, or be secreted into the culture medium. As used herein, the term "recovering" refers to collecting the culture medium containing the molecule and/or recombinant cells. Recovery need not imply additional steps of separation or purification. After recovery, an RCA protein or SCM molecule can be purified using a variety of standard protein purification techniques such as, but not limited to, size separation chromatography, reverse phase chromatography, chromatofocussing, hydroxyapatite adsorption and electrophoresis systems, affinity chromatography, ion exchange chromatography, ammonium sulfate precipitation, filtration, centrifugation, hydrophobic interaction chromatography, gel filtration chromatography, high pressure liquid chromatography and differential solubilization. Isolated proteins are preferably retrieved in substantially pure form. As used herein, "substantially pure" refers to a purity that allows for the effective use of the molecule as a heretofore described T cell veto molecule. Soluble RCA proteins or SCM molecules of the present invention can be purified using, for example, immunoaffinity chromatography using an antibody capable of binding to CD4, CD2, CD28, CTL4A, fas-ligand or the C region of an immunoglobulin molecule or an antigen capable of binding to the V region of immunoglobulin molecule. RCA proteins or SCM molecules anchored in a lipid-containing substrate can be recovered by, for example, density gradient centrifugation techniques. One aspect of the present invention is a method for producing a T cell veto molecule, comprising: (a) providing a first protein comprising an RCA protein, in particular CD4, CD2, CD28, CTL4A, fas-ligand protein, CD5 protein, CD7 protein, CD9 protein, CDll protein, CD18 protein, CD27 protein, CD43 protein, CD45 protein, CD48 protein, B7.1 protein and B7.2 protein; (b) providing a second protein comprising an SCM molecule; and (c) linking the first protein to the second protein to form a chimeric molecule. As used herein, the term "linked" can refer to covalently attaching an RCA protein to an SCM molecule. A suitable reagent for the linking step includes any reagent capable of creating di-sulfide bonds between an RCA protein and an SCM molecule. Preferably, an RCA protein can be covalently associated to an SCM molecule by several methods including, for example, treatment with chemicals capable of linking di-sulfide bonds, glutaraldehyde linkage, photoaffinity labeling, treatment with carbodiimides and treatment with other cross-linking chemicals standard in the art. Preferably, an RCA protein can be covalently associated to an SCM molecule by treatment with chemicals capable of linking di-sulfide bonds, in particular using N-succinimidyl-3-l-(l-pyridyldthio)-propionate. Following chemical cross-linking of an RCA protein to an SCM molecule, the resulting chimeric T cell veto molecules are recovered from those proteins that have not been linked using methods standard in the art. Preferably, T cell veto molecules are recovered by size separation chromatography. A T cell veto molecule of the present invention preferably comprises a CD4:Ig protein having the amino acid sequence represented by SEQ ID NO:17, di-sulfide bonded to an antibody that binds specifically to an MHC molecule, in particular 14-4-4 to form the CD4:14 T cell veto molecule (see Examples section) . A T cell veto molecule of the present invention also preferably comprises a CD2:Ig having the amino acid sequence represented by SEQ ID NO:18, di-sulfide bonded to an antibody that binds specifically to an MHC molecule, in particular 14-4-4 to form the CD2:14 T cell veto molecule. According to the present invention, different embodiments of a T cell veto molecule of the present invention can be combined to form a composition of the present invention. A preferred composition comprises a CD4 protein linked to a target molecule that differentiates a host cell from a tissue graft cell, a chimeric molecule having a CD2 protein linked to target molecule that differentiates a host cell from a tissue graft cell, a chimeric molecule having a CD28 protein linked to target molecule that differentiates a host cell from a tissue graft cell, a chimeric molecule having a CTL4A protein linked to target molecule that differentiates a host cell from a tissue graft cell, a chimeric molecule having a fas-ligand protein linked to target molecule that differentiates a host cell from a tissue graft cell and mixtures thereof. A more preferred composition comprises CD4:14 T cell veto molecule, CD2:14 T cell veto molecule and mixtures thereof. Another aspect of the present invention comprises formulating a T cell veto molecule of the present invention with a pharmacologically acceptable carrier to form a therapeutic composition of the present invention. As used herein, a "carrier" refers to any substance suitable as a vehicle for delivering a T cell veto molecule to a suitable in vitro or in vivo site of action. As such, carriers can act as an excipient for formulation of a therapeutic or experimental reagent containing a T cell veto molecule. Preferred carriers are capable of maintaining a T cell veto molecule in a form that is capable of binding to a stimulating cell and regulating the activity of a responding cell. Examples of such carriers include, but are not limited to water, phosphate buffered saline, saline, Ringer's solution, dextrose solution, serum-containing solutions, Hank's solution and other aqueous physiologically balanced solutions. Aqueous carriers can also contain suitable auxiliary substances required to approximate the physiological conditions of the recipient, for example, enhancement of chemical stability and isotonicity. Suitable auxiliary substances include, for example, sodium acetate, sodium chloride, sodium lactate, potassium chloride, calcium chloride, sorbitan monolaurate, triethanolamine oleate, and other substances used to produce phosphate buffer, Tris buffer and bicarbonate buffer. Auxiliary substances can also include preservatives, such as thimerosal, m or o-cresol, formalin and benzyl alcohol. Preferred auxiliary substances for aerosol delivery include surfactant substances nontoxic to a recipient, for example, esters or partial esters of fatty acids containing from about 6 to about 22 carbon atoms. Examples of esters include, caproic, octanoic, lauric, palmitic, stearic, linoleic, linolenic, olesteric and oleic acids. Therapeutic compositions of the present invention can be sterilized by conventional methods and/or lyophilized. Standard formulations can either be liquid injectables or solids which can be taken up in a suitable liquid as a suspension or solution for injection. Thus, in a non-liquid formulation, the excipient can comprise dextrose, human serum albumin, preservatives, etc., to which sterile water or saline can be added prior to administration. A therapeutic composition can further comprise a T cell veto molecule combined with a compound capable of suppressing an immune response. Such regulatory compounds include, but are not limited to, immunosuppressive drugs or antibodies that specifically bind to interleukins. Useful carriers for membrane-bound T cell veto molecules include any artificial or natural lipid-containing substrate, preferably cells, cellular membranes, liposomes and micelles. Cellular carriers of the present invention include cells capable of producing a T cell veto molecule. Preferred cells are disclosed in detail herein. Embodiments of the present invention comprise the use of a T cell veto molecule, as disclosed in the present invention, to suppress the activity of immune cells in vivo or in vitro . In particular, a T cell veto molecule of the present invention is useful for administration to subjects to immunosuppress subjects against, for example, autoantigens, allergens, engraftments and agents perfused into subjects (i.e., blood factors and platelets). This process is particularly applicable for purposes of specific immunosuppression, and derives from the novel structure of a T cell veto molecule of the present invention. Immune cells refers to cells typically involved in an immune response (e.g., T cells, APCs etc.). Immunosuppression refers to inhibiting an immune response by, for example, killing or anergizing (i.e., diminishing reactivity by a T cell to an antigenic peptide) particular cells involved in the immune response. A particular advantage of a T cell veto molecule of the present invention is that such molecules can be designed to regulate the activity of one type of responder cell without regulating the activity of another type of responder cell. For example, a CD4:anti-class II MHC T cell veto molecule of the present invention can selectively regulate the activity of CD4 + T cells without regulating the activity of CD8 + T cells. Similarly, a CD8:anti-class I MHC T cell veto molecule can selectively regulate the activity of CD8 + T cells without regulating the activity of CD4 + T cells. Prior to the present invention, one theory of T cell veto suggested that simultaneous engagement of T cells through the T cell receptor and through the α3 domain of the class I MHC molecule results in the deletion of the T cell. If this theory is correct, then a veto molecule of the present invention which includes CD8, for example, could be targeted to a stimulator cell such that the stimulator cell effectively "expresses" the CD8. This stimulator cell would then have the capability to provide the above-mentioned deleterious trigger to an alloreactive T cell by virtue of its ability to simultaneously engage an alloreactive T cell receptor and the T cell's class I MHC. Furthermore, according to this theory of T cell veto, a CD8 veto molecule would be expected to provide the same deleterious trigger to either a CD8 + or a CD4 T cell, since both T cell types express a T cell receptor and class I MHC. The present inventors have unexpectedly discovered, however, that such a CD8 veto molecule is in fact incapable of inhibiting CD4 + T cells, and similarly, a veto molecule which includes CD4 inhibits CD4 + T cells, but is incapable of inhibiting CD8 + T cells (See Example 4 below) . The present inventors describe for the first time herein T cell veto molecules which can selectively inhibit one type of responder cell (e.g., a CD4 + T cell) without inhibiting another type of responder cell (e.g. , a CD8 + T cell) . The disclosure herein of T cell veto molecules which can inhibit different subsets of T cells in such a highly selective manner is significant, because different subsets of T cells have different functions in immune responses. In many disease states and conditions involving an immune response, it may be desirable to regulate the activity of one subset of T cell while leaving the activity of another subset of T cell intact. For example, it may be desirable to inhibit the activity of CD4 + T cells at a particular site in vivo in a given autoimmune disease, but leave other immune functions (e.g., CD8 + T cell function and all T cell functions at other in vivo sites) intact. In another situation, it may be desirable only to target activated T cells at a particular site. In this scenario, selective inhibition of T cells expressing Fas by using a veto molecule which includes Fas ligand may be desirable. The T cell veto molecules and methods disclosed herein provide such selective inhibition. One aspect of the present invention is a method to suppress an immune response comprising: (a) providing a chimeric molecule having a protein, selected from the group consisting of CD4, CD2, CD28, CTL4A, fas-ligand, CD5 protein, CD7 protein, CD9 protein, CDll protein, CD18 protein, CD27 protein, CD43 protein, CD45 protein, CD48 protein, B7.1 protein and B7.2 protein linked to a responding cell marker molecule; and (b) exposing the chimeric molecule to an antigen presenting cell that can respond to the chimeric molecule, for a time and under conditions sufficient to reduce a cellular immune response of a T lymphocyte to an antigen. The present method is particularly useful for reducing the response of a T cell to an antigen comprising an alloantigen or a processed antigen. Preferably, the chimeric molecule is contacted with the antigen presenting cell in vivo. Acceptable protocols to administer therapeutic compositions in vivo in an effective manner include individual dose size, number of doses, frequency of dose administration and mode of administration. Determination of such protocols can be accomplished by those skilled in the art depending upon a variety of variables, including the animal to be treated, the type of treatment being administered (e.g. , graft rejection prevention or treatment of an autoimmune disease) and the stage of disease. Effective doses to immunosuppress an animal include doses administered over time that are capable of alleviating an immune response by the animal. For example, a single suppressing dose can comprise an amount of a therapeutic composition of the present invention that sufficiently ablates an immune response against an alloantigen, compared with an immune response in the absence of the therapeutic composition. Alternatively, a single suppressing dose can comprise an amount of a therapeutic composition of the present invention that partially reduces an immune response against an alloantigen, compared with an immune response in the absence of the therapeutic composition. In this case, repeated administrations of the single dose could be given to an animal until the immune response is sufficiently ablated. A suitable single dose of a therapeutic composition of the present invention is a dose that is capable of substantially inhibiting a T cell response to an antigen when administered one or more times over a suitable time period. A single dose of a therapeutic composition preferably ranges from about 1 micrograms (μg) to about 100 milligrams (mg) , more preferably ranges from about 10 μg to about 10 mg and even more preferably ranges being from about 100 μg to about 1 mg of a therapeutic composition per subject, of a toleragenic therapeutic reagent per subject. Effective doses to suppress an animal include doses administered over time that are capable of decreasing T cell activation to an antigen by an animal. For example, a first suppressing dose can comprise an amount of a therapeutic composition of the present invention that prevents an immune response when administered to an animal. A second suppressing dose can comprise a lesser amount of the same therapeutic composition than the first dose to continue prevention of an immune response. For example, if a first dose can comprise about IO 6 arbitrary units of a TLV molecule, then a second dose can comprise about 10 3 arbitrary units of a TLV molecule. Effective suppressing doses can comprise decreasing concentrations of a therapeutic composition of the present invention necessary to maintain an animal in a suppressed state, such that the animal does not have an immune response to subsequent exposure to an antigen. The manner of administration of a therapeutic composition of the present invention can depend upon the particular purpose for the delivery (e.g. , treatment of disease or prevention of graft rejection) , the overall health and condition of the recipient and the judgement of the physician or technician administering the therapeutic composition. A therapeutic composition of the present invention can be administered to an animal using a variety of methods. Such delivery methods can include parenteral, topical, oral or local administration, such as intradermally or by aerosol. A therapeutic composition can be administered in a variety of unit dosage forms depending upon the method of administration. For example, unit dosage forms suitable for oral administration to the intestinal region of an animal include powder, tablets, pills and capsules. Preferred delivery methods for a therapeutic composition of the present invention include intravenous administration and local administration by, for example, injection or topical administration. For particular modes of delivery, a therapeutic composition of the present invention can be formulated in an excipient of the present invention. A therapeutic reagent of the present invention can be administered to any animal, preferably to mammals, and more preferably to humans. As an example of a T cell veto molecule-mediated immunosuppressive therapeutic process, the sequence of steps that can be executed for inducing suppression in a prospective transplant recipient for the allogeneic MHC molecule of the transplant donor, in order to prevent immunological rejection of the graft following transplantation, are as follows: (a) gene constructs are assembled for producing human CD4, human CD2 and specific antibodies that bind to MHC Class II molecules. In each case, the coding sequence for the extracellular domain of CD4 or CD2 is subcloned into pVL1393 vector. (b) The subcloned coding sequences are transfected into insect cells in order to produce recombinant CD4, CD2 and immunoglobulin protein. The transfected cells are maintained in serum-free, protein-free medium. (c) Dimers of soluble human CD4 or human CD2 are harvested from the cell cultures by the following method. Tissue culture supernatant, adjusted to pH 8.5, is filtered through a Mono-Q-Sepharose column (Pharmacia, Uppsala, Sweden) . The flow-though is loaded onto a Wheatger - Lectin-Sepharose column (Pharmacia) , and CD4 or CD2 are eluted with 5% N-acetyl-glucosamine. The eluate is diaiyzed against 20 mM NaC 2 H 3 0 2 (pH 5.4, Sigma), concentrated and loaded onto Mono-S-Sepharose (Pharmacia) pre-equilibrated with 20 mM HEPES (pH 8.0, Sigma). Soluble CD4 or CD2 is eluted as the first peak of a NaCl-gradient (20 mM to 500 mM, Sigma) in 20 mM HEPES (pH 8.0) and diaiyzed against PBS. The purity of the CD4 or CD2 dimers is analyzed by resolution using SDS-PAGE gel electrophoresis. Immunoglobulin molecules are purified from tissue-culture supernatant on a Protein A-Sepharose column (Pharmacia) using a standard protocol. (d) Soluble CD4 or CD2, and immunoglobulin are cross-linked using the heterobifunctional cross-linker, N-succinimidyl-3-(l-pyridyldithio) -propionate (SPDP, Pharmacia) according to standard methods, at pH 7.4. Cross-linked proteins are purified from unreacted proteins and SPDP by passage of the preparation over on a Sephadex G25 column (Pharmacia) . (e) A subject who is to undergo a transplant is assessed for alloreactivity to donor allo-MHC by isolating peripheral blood mononuclear cells (PBMC) from the prospective transplant recipient's blood, and setting up a mixed lymphocyte reaction (MLR) with the recipient's PBMC as responders and irradiated (1500 rads) donor PBMC as stimulators. If a significant proliferative response is noted, a therapeutic composition comprising a TLV molecule or composition thereof, corresponding to the donor allo-MHC, are infused intravenously into the graft recipient about 4 to about l weeks prior to the planned transplantation procedure. (f) At about 2 to about 1 weeks prior to the transplantation date, the MLR is repeated, and if a residual proliferative response between recipient responders and donor stimulators persists, the therapeutic composition is reinfused into the graft recipient. (g) The MLR is repeated post-transplantation to assess the need for booster doses to the graft recipient of a therapeutic composition which can be administered systemically or topically, as required. Another example of a TLV molecule-mediated immunosuppressive therapeutic process, the sequence of steps (a) through (d) from the foregoing example are repeated and the cells of a graft are coated with a therapeutic composition of the present invention, and then the graft is transplanted into a recipient. The process is applicable to a variety of graft types, including vascularized solid tissue (e.g., kidney, heart, liver, lung and skin) and dispersed cellular populations (e.g., bone marrow cells) . Treatment of a solid graft can comprise the steps of: (1) perfusing the donor organ at the time of surgery and prior to its resection, with about 100 μg/ml of a therapeutic composition comprising TLV molecules contained in normal saline via a bolus injection into a vessel entering the organ; and (2) catherizing the vessel, resecting the organ and storing the organ in a solution supplemented with a therapeutic composition of the present invention until transplantation. Treatment of a dispersed cell population can comprise the steps of: (l) aspirating a cell population from a donor and separating the cells from undesired blood elements using methods standard in the art; and (2) resuspending the isolated donor cells in about 10 μg/ml of a therapeutic composition comprising TLV molecules contained in normal saline for about 2 hours at 5° C until transplantation. It is within the scope of the invention that the pre-treatment of a recipient and the treatment of a graft tissue can be performed separately or in combination, depending on the parameters of the transplantation (e.g., donor-recipient allotype match, type of tissue etc.). It is also within the scope of the present invention that modifications can be made to the therapeutic processes disclosed herein. For example, subjects afflicted with autoimmune disease can treated by systemically administering a therapeutic composition of the present invention using similar steps as those outlined for the pre-treatment of graft recipients. Alternatively, a therapeutic composition can be administered to subjects afflicted with localized autoimmune diseases, such as rheumatoid arthritis, by directly injecting the composition into a diseased area such as a joint. Other examples of autoimmune diseases that can be treated using a therapeutic composition of the present invention include systemic lupus erythematosus, myasthenia gravis, rheumatoid arthritis, insulin-dependent diabetes mellitus, multiple sclerosis, celiac disease, autoimmune thyroiditis, Addison's disease, Graves' disease and rheumatic carditis. One embodiment of a therapeutic method of the present invention includes administering a high dose of corticosteroids, for example dexamethasone in two injections (about lmg per day for two days, followed by the step of administering a T cell veto molecule of the present invention for the next four weeks, at a concentration of about lmg per injection (intravenous) twice a week. The following experimental results are provided for purposes of illustration and are not intended to limit the scope of the invention. EXAMPLES Example 1 This example describes the production of chimeric cDNA clones encoding CD2:Ig or CD4:Ig molecules. A. Production of Human Blood or 15.5.5. cDNA Two separate samples of cDNA were prepared using mRNA isolated from human blood or 15.5.5 cells (described in Ozato et al., 1980, J. Immunol . 124: 533) by the following method. About 2mL Trizol (Gibco-BRL, Gaithersburg, MD) was added to the cells. The cells were then extracted 1 time with 100% chloroform. The RNA in the aqueous phase was treated with 100% isopropyl alcohol and the resulting precipitate was pelleted at 12,000 x rpm for 10 minutes. The resulting pellet containing RNA was resuspended in water containing 0.1% diethylpyrocarbonate (DEPC). The RNA was then reverse transcribed into cDNA according to methods standard in the art using reverse transcriptase, oligo dT as a primer and a mixture of nucleotides. B. Production of CD2, CD4 and Immunoglobulin cDNA cDNA encoding the extracellular domains of CD2 was produced by polymerase chain reaction (PCR) amplification using the following method. Human cDNA described in Section A was combined with CD2 sense primer (5' CGC TCT AGA ATG AGC TTT CCA TGT AAA TTT GTA 3'; SEQ ID NO:22) and CD2 anti-sense primer (5' TGT GGG CCC TCT GGG CTC GTC CAG ACC TTT CTC TGG 3'; SEQ ID NO:23). The mixture was amplified for 3 cycles at 94°C (60 sec), 50°C (30 sec), 72°C (60 sec) followed by 27 cycles at 94°C (60 sec), 55°C (30 sec), and 72°C (60 sec). A 10 minute 72°C final elongation was then performed to produce amplified CD2 cDNA. cDNA encoding the two amino terminal domains of CD4 was produced by PCR amplification using the following method. Human cDNA described in Section A was combined with CD4 sense primer (5' CGC TCT AGA ATG AAC CGG GGA GTC CCT 3'; SEQ ID NO:24) and CD4 anti-sense primer (5' GGG CCC TCT GGG CTC AGC TAG CAC CAC GAT GTC T 3'; SEQ ID NO:25). The mixture was then amplified as described above to produce amplified CD4 cDNA. cDNA encoding the Fc domain of the 15.5.5 anti-class I (IgG2a isotype) monoclonal antibody was produced as follows. The cDNA produced from the 15.5.5 cell cDNA described in Section A was mixed with either a first IgG2a sense primer(CD2 sense primer: 5' CCA GAG AAA GGT CTG GAC GAG CCC AGA GGG CCC AC 3'; SEQ ID NO:26) or a second IgG2 sense primer (CD4 sense primer: 5' AGA CAT CGT GGT GCT AGC TGA GCC CAG AGG GCC C 3'; SEQ ID NO:27), and IgG2a anti-sense primer (5' GGC GAA TTC TTT ACC CGG AGT CCG GGA GAA GCT 3'; SEQ ID NO:28). The cDNAs were amplified using the conditions described in above to produce a first and a second IgG2a Fc domain cDNA. C. Production of Chimeric Molecules PCR amplification was then used to link cDNA encoding the extracellular domains of CD2 or CD4 to cDNA encoding the Fc domain of the 15.5.5 anti-class I monoclonal antibody (I.e., CD2-IgG2a fusion cDNA and CD4-lgG2a fusion cDNA) . CD2-IgG2a fusion cDNA was produced by combining cDNA encoding the extracellular domains of CD2 with cDNA encoding the Fc domain of 15.5.5 antibody produced using the CD2 sense primer. CD4-IgG2a fusion cDNA was produced by combining cDNA encoding the amino terminal domains of CD4 with cDNA encoding the Fc domain of 15.5.5 antibody produced using the CD4 sense primer. Both of the foregoing /37687 PC17US97/05943 mixtures were amplified using the amplification conditions described in section B. Example 2 This example describes the production of expression vectors encoding chimeric CD2:IgG2a or CD4:IgG2a fusion molecules. Each of the CD2:IgG2a or CD4:IgG2a fusion cDNA described in Example 1 were purified on a 1.0% agarose gel and recovered by Geneclean Kit (BIO 101 Inc., LaJolla, CA) . The gel purified CD2:IgG2a fragment was directly ligated into PCRII vector (Invitrogen, San Diego, CA) . The CD4:IgG2a fragment was also directly ligated into the PCRII vector. The PCRII vector is a linear vector with poly T overhangs for direct ligation. InvaF' E. Coli (obtained from Invitrogen) were then transformed with either pCD2:IgG2a or pCD4:IgG2a and the colonies were grown on LB plates containing about lOOmg/ L ampicillin. Resulting colonies were screened by PCR amplification using appropriate primers. pCD2:IgG2a or pCD4:IgG2a plasmid was then isolated from bacterial colonies by propagating in liquid culture comprising LB broth and 50mg/mL ampicillin and purifying the plasmid using methods standard in the art (see Sambrook et al., iJid.). Purified plasmid DNA was then digested with Xbal and EcoRI to yield a fragment of cDNA encoding a CD2-IgG2a fusion molecule or cDNA encoding a CD4-IgG2a fusion molecule. These fragments were then gel-purified as described above and separately ligated into the baculovirus transfer vector PVL 1393 (obtained from Pharmingen, San Diego, CA) which had previously been digested with Xbal and EcoRI, to form the expression vectors pVLCD2:IgG2a or pVLCD4:IgG2a. The expression vectors were then transformed into InvaF' E. Coli, selected as described above and frozen at -70°C for later use. Example 3 This Example shows that a CD4:anti-H-2 d , T lymphocyte veto molecule of the present invention, which is targeted to the class II MHC of allogeneic stimulator cells in a T cell proliferation assay, demonstrates significant and specific inhibition of CD4 + T-cell responses. A transfectant secreting a soluble form of CD4 was obtained from K. Karjalainen (Basel Institute for Immunology) . This material was purified by affinity chromatography and chemically (SPDP) cross-linked to the monoclonal antibody 14-4-4 which binds to certain class II MHC molecules (anti-H-2 d , but not anti-H-2 b ) to form a hybrid antibody T lymphocyte veto molecule of the present invention. Lymph node cells (50 or 200 x 10 5 per culture) , which were enriched for CD4+ T-cells by two-step panning (purity >90% CD4 + T-cells) , were challenged with irradiated stimulator cells (200 x 10 5 ) in triplicate cultures (Figure 1) . These mixed lymphocyte cultures (MLCs) were set up in two combinations, C57BL/6 anti-BALB/c, where C57BL/6 cells are responders and BALB/c cells are stimulators (Figure IA and IB) ; and BALB/c anti-C57BL/6, where BALB/c cells are responders and C57BL/6 cells are stimulators (Figure IC and ID) . Whereas in the first set of MLCs the hybrid antibody can bind to the stimulator cells (BALB/c H-2 d ) , in the second set it will not bind to the stimulator cells (C57BL/6 H-2 b ) , but will bind instead to the responder cells (BALB/c) . Either the hybrid antibody, its non-linked components or medium only (nothing) was added to the MLCs. After 3 days, the cultures were pulsed with [ 3 H]-thymidine for 18 hours and then harvested. Inhibition of proliferation was only observed when the hybrid antibody bound to the stimulators (Figure IA and IB) , but not when the antibody bound to the responders (Figure IC and ID) . In addition, supplementing cultures with non-linked components of the hybrid antibody, soluble CD4 and 14-4-4, did not result in any reduction of the response. Therefore, in order to inhibit proliferation of allo-reactive CD4 + T-cells, the CD4 molecule has to be linked to 14-4-4 in a hybrid antibody and the hybrid antibody has to bind to the stimulator cells. Thus, hybrid antibody-mediated 'veto' is effective and specific To determine whether other T-cell functions besides proliferation were affected, . MLCs (C57BL/6 anti-BALB/c) were set up with CD4 + T-cells. C57BL/6 CD4+ T-cell responders (200 x 10 s per culture) were challenged with irradiated BALB/c stimulator cells (200 x 10 s per culture) . Either the hybrid antibody (shown in Figure 2 as •) or its non-linked components (shown in Figure 2 as o) were added. After 3 days supernatants were harvested and tested for the presence of IL-2 and IL-4 by adding the supernatants to HT- 2 cells in different dilutions [neat (1), 30% (0.3), 10% (0.1) and 3% (0.3)]. After 18 hours HT-2 cells were pulsed with [3H]-thymidine. As shown in a representative experiment (Figure 2) , only the hybrid antibody was able to cause inhibition of IL-2/IL-4 production; its non-linked components failed to do so. The foregoing experiment establishes the feasibility of this hybrid antibody inhibition by showing that "veto 1 can be adapted for the inhibition of class II-reactive T- cells. Example 4 The following example demonstrates that the activation of CD4 + and CD8 + T cells with a specificity for given stimulator cells (e.g., alloreactive T cells) can be inhibited in a highly selective manner. In this experiment, a CD8:Ig hybrid molecule which included a CD8 α chain molecule and an anti-H-2D d antibody (anti-Class I MHC) was produced in a similar manner as described in Examples 1 and 2 for the CD4:Ig and CD2:Ig veto molecules. When this veto molecule was added to MLCs as described above, the veto molecule completely suppressed the lytic responses of CD8 + T cells. Unexpectedly, the CD8:anti-H-2 d veto molecule was incapable of inhibiting the action of CD4 + T lymphocytes (data not shown) . In a parallel experiment, when the CD4:anti-H-2 d veto molecule described in Example 3 above was added to the same cells, this CD4 veto molecule inhibited CD4 + T cell activation, but was incapable of interfering with the development of CD8 + cytotoxic effector T cells (data not shown) . Therefore, these companion experiments demonstrated that targeted expression of CD8 on stimulator cells specifically inhibited CD8 + T cells without interfering with the function of CD4 + T cells, whereas targeted expression of CD4 on stimulator cells specifically inhibited CD4 + T cells without interfering with the function of CD8 + T cells. SEQUENCE LISTING (1) GENERAL INFORMATION: (i) APPLICANT: Staerz, Uwe (ii) TITLE OF INVENTION: NOVEL PRODUCT AND PROCESS FOR T LYMPHOCYTE VETO (iii) NUMBER OF SEQUENCES: 41 (iv) CORRESPONDENCE ADDRESS: (A) ADDRESSEE: Sheridan Ross 6 Mclntosh (B) STREET: 1700 Lincoln Street, 35th Floor (C) CITY: Denver (D) STATE: Colorado (E) COUNTRY: U.S. (F) ZIP: 80203 (v) COMPUTER READABLE FORM: (A) MEDIUM TYPE: Floppy disk (B) COMPUTER: IBM PC compatible (C) OPERATING SYSTEM: PC-DOS/MS-DOS (D) SOFTWARE: Patentin Release #1.0, Version #1.25 (vi) CURRENT APPLICATION DATA: (A) APPLICATION NUMBER: (B) FILING DATE: (C) CLASSIFICATION: (viii) ATTORNE /AGENT INFORMATION: (A) NAME: Connell, Gary J. (B) REGISTRATION NUMBER: 32,020 (C) REFERENCE/DOCKET NUMBER: 2879-36 (ix) TELECOMMUNICATION INFORMATION: (A) TELEPHONE: (303) 863-9700 (B) TELEFAX: (303) 863-0223 (2) INFORMATION FOR SEQ ID NO:l: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 138 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:l: Asn Lys Val Val Leu Gly Lye Lys Gly Asp Thr Val Glu Leu Thr Cys 1 5 10 15 Thr Ala Ser Gin Lys Lys Ser lie Gin Phe His Trp Lys Asn Ser Asn 20 25 30 Gin lie Lys lie Leu Gly Asn Gin Gly Ser Phe Leu Thr Lys Gly Pro 35 40 45 Ser Lys Leu Asn Asp Arg Ala Asp Ser Arg Arg Ser Leu Trp Aβp Gin 50 55 60 Gly Asn Phe Pro Leu lie lie Lys Asn Leu Lys lie Glu Asp Ser Aβp 65 70 75 80 Thr Tyr lie Cys Glu Val Glu Asp Gin Lys Glu Glu Val Gin Leu Leu 85 90 95 Val Phe Gly Leu Thr Ala Asn Ser Asp Thr His Leu Leu Gin Gly Gin 100 105 110 Ser Leu Thr Leu Thr Leu Glu Ser Pro Pro Gly Ser Ser Pro Ser Val 115 120 125 Gin Cys Arg Ser Pro Arg Gly Lys Asn lie 130 135 (2) INFORMATION FOR SEQ ID NO:2: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 184 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:2: Lys Glu lie Thr Aan Ala Leu Glu Thr Trp Gly Ala Leu Gly Gin Asp 1 5 10 15 He Asn Leu Asp He Pro Ser Phe Gin Met Ser Asp Asp He Asp Asp 20 25 30 37687 PC17US97/05943 He Lys Trp Glu Lys Thr Ser Asp Lys Lys Lys He Ala Gin Phe Arg 35 40 45 Lys Glu Lys Glu Thr Phe Lys Glu Lys Asp Thr Tyr Lys Leu Phe Lys 50 55 60 Asn Gly Thr Leu Lys He Lys His Leu Lye Thr Asp Asp Gin Asp He 65 70 75 80 Tyr Lys Val Ser He Tyr Aβp Thr Lys Gly Lys Asn Val Leu Glu Lys 85 90 95 He Phe Asp Leu Lys He Gin Glu Arg Val Ser Lys Pro Lys He Ser 100 105 HO Trp Thr Cys He Asn Thr Thr Leu Thr Cys Glu Val Met Asn Gly Thr 115 120 125 Aβp Pro Glu Leu Asn Leu Tyr Gin Asp Gly Lys His Leu Lys Leu Ser 130 135 140 Gin Arg Val He Thr His Lys Trp He Thr Ser Leu Ser Ala Lys Phe 145 150 155 160 Lys Cys Thr Ala Gly Asn Lys Val Ser Lys Glu Ser Ser Val Glu Pro 165 170 175 Val Ser Cys Pro Glu Lys Gly Leu 180 (2) INFORMATION FOR SEQ ID NO:3: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 134 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:3: Asn Lys He Leu Val Lys Gin Ser Pro Met Leu Val Ala Tyr Asp Asn 1 5 10 15 Ala Val Asn Leu Ser Cyβ Lys Tyr Ser Tyr Asn Leu Phe Ser Arg Glu 20 25 30 Phe Arg Ala Ser Leu His Lys Gly Leu Asp Ser Ala Val Glu Val Cys 35 40 45 Val Val Tyr Gly Asn Tyr Ser Gin Gin Leu Gin Val Tyr Ser Lys Thr 50 55 60 Gly Phe Asn Cys Asp Gly Lys Leu Gly Asn Glu Ser Val Thr Phe Tyr 65 70 75 80 Leu Gin Asn Leu Tyr Val Asn Gin Thr Asp He Tyr Phe Cys Lys He 85 90 95 Glu Val Met Tyr Pro Pro Pro Tyr Leu Asp Asn Glu Lys Ser Asn Gly 100 105 HO Thr He He His Val Lys Gly Lys His Leu Cys Pro Ser Pro Leu Phe 115 120 125 Pro Gly Pro Ser Lys Pro 130 (2) INFORMATION FOR SEQ ID NO:4: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 124 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:4: Met His Val Ala Gin Pro Ala Val Val Leu Ala Ser Ser Arg Gly He 1 5 10 15 Ala Ser Phe Val Cyβ Glu Tyr Ala Ser Pro Gly Lys Ala Thr Glu Val 20 25 30 Arg Val Thr Val Leu Arg Gin Ala Asp Ser Gin Val Thr Glu Val Cyβ 35 40 45 Ala Ala Thr Tyr Met Met Gly Asn Glu Leu Thr Phe Leu Asp Asp Ser 50 55 60 He Cys Thr Gly Thr Ser Ser Gly Asn Gin Val Asn Leu Thr He Gin 65 70 75 80 Gly Leu Arg Ala Met Asp Thr Gly Leu Tyr He Cys Lys Val Glu Leu 85 90 95 Met Tyr Pro Pro Pro Tyr Tyr Leu Gly He Gly Asn Gly Ala Gin He 100 105 HO Tyr Val He Asp Pro Glu Pro Cys Pro Asp Ser Asp 115 120 (2) INFORMATION FOR SEQ ID NO:5: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 145 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:5: Pro Pro Glu Lys Lys Glu Leu Arg Lys Val Ala His Leu Thr Gly Lys 1 5 10 15 Ser Asn Ser Arg Ser Met Pro Leu Glu Trp Glu Asp Thr Tyr Gly He 20 25 30 Val Leu Leu Ser Gly Val Lys Tyr Lys Lys Gly Gly Leu Val He Asn 35 40 45 Glu Thr Gly Leu Tyr Phe Val Tyr Ser Lys Val Tyr Phe Arg Gly Gin 50 55 60 Ser Cys Asn Asn Leu Pro Leu Ser His Lys Val Tyr Met Arg Asn Ser 65 70 75 80 Lys Tyr Pro Gin Asp Leu Val Met Met Glu Gly Lys Met Met Ser Tyr 85 90 95 Cyβ Thr Thr Gly Gin Met Trp Ala Arg Ser Ser Tyr Lys Gly Ala Val 100 105 110 Phe Asn Leu Thr Ser Ala Asp His Leu Tyr Val Asn Val Ser Glu Leu 115 120 125 Ser Leu Val Asn Phe Glu Glu Ser Gin Thr Phe Phe Gly Leu Tyr Lys 130 135 140 Leu 145 (2) INFORMATION FOR SEQ ID NO:6: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 349 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:6: PCΪ7US97/05943 Arg Leu Ser Trp Tyr Asp Pro Aβp Phe Gin Ala Arg Leu Thr Arg Ser 1 5 10 15 Asn Ser Lys Cys Gin Gly Gin Leu Glu Val Tyr Leu Lys Asp Gly Trp 20 25 30 His Met Val Cys Ser Gin Ser Trp Gly Arg Ser Ser Lys Gin Trp Glu 35 40 45 Asp Pro Ser Gin Ala Ser Lys Val Cys Gin Arg Leu Asn Cys Gly Val 50 55 60 Pro Leu Ser Leu Gly Pro Phe Leu Val Thr Tyr Thr Pro Gin Ser Ser 65 70 75 80 He He Cys Tyr Gly Gin Leu Gly Ser Phe Ser Asn Cyβ Ser His Ser 85 90 95 Arg Asn Asp Met Cys His Ser Leu Gly Leu Thr Cys Leu Glu Pro Gin 100 105 110 Lys Thr Thr Pro Pro Thr Thr He He Pro Pro Pro Thr Thr Thr Pro 115 120 125 Glu Pro Thr Ala Pro Pro Arg Leu Gin Leu Val Ala Gin Ser Gly Gly 130 135 140 Gin His Cyβ Ala Gly Val Val Glu Phe Tyr Ser Gly Ser Leu Gly Gly 145 150 155 160 Thr He Ser Tyr Glu Ala Gin Asp Lys Thr Gin Asp Leu Glu Asn Phe 165 170 175 Leu Cys Asn Asn Leu Gin Cys Gly Ser Phe Leu Lys His Leu Pro Glu 180 185 190 Thr Glu Ala Gly Arg Ala Gin Asp Pro Gly Glu Pro Arg Glu His Gin 195 200 205 Pro Leu Pro He Gin Trp Lys He Gin Asn Ser Ser Cys Thr Ser Leu 210 215 220 Glu His Cys Phe Arg Lys He Lys Pro Gin Lys Ser Gly Arg Val Leu 225 230 235 240 Ala Leu Leu Cys Ser Gly Phe Gin Pro Lys Val Gin Ser Arg Leu Val 245 250 255 Gly Gly Ser Ser He Cys Glu Gly Thr Val Glu Val Arg Gin Gly Ala 260 265 270 Gin Trp Ala Ala Leu Cyβ Asp Ser Ser Ser Ala Arg Ser Ser Leu Arg 275 280 285 Trp Glu Glu Val Cys Arg Glu Gin Gin Cyβ Gly Ser Val Aβn Ser Tyr 290 295 300 Arg Val Leu Aβp Ala Gly Asp Pro Thr Ser Arg Gly Leu Phe Cys Pro 305 310 315 320 His Gin Lys Leu Ser Gin Cyβ Hie Glu Leu Trp Glu Arg Aβn Ser Tyr 325 330 335 Cys Lys Lys Val Phe Val Thr Cys Gin Asp Pro Aβn Pro 340 345 (2) INFORMATION FOR SEQ ID NO:7: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 154 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:7: Ala Gin Glu Val Gin Gin Ser Pro His Cyβ Thr Thr Val Pro Gly Ala 1 5 10 15 Ser Val Aβn He Thr Cys Ser Thr Ser Gly Gly Leu Arg Gly He Tyr 20 25 30 Leu Pro Gin Leu Gly Pro Gin Pro Gin Asp He He Tyr Tyr Glu Aβp 35 40 45 Gly Val Val Pro Thr Thr Asp Arg Arg Phe Arg Gly Arg He Asp Phe 50 55 60 Ser Gly Ser Gin Asp Asn Leu Thr He Thr Met His Arg Leu Gin Leu 65 70 75 80 Ser Asp Thr Gly Thr Tyr Thr Cys Gin Ala He Thr Glu Val Asn Val 85 90 95 Tyr Gly Ser Gly Thr Leu Val Leu Val Thr Glu Glu Gin Ser Gin Gly 100 105 110 Trp His Arg Cys Ser Asp Ala Pro Pro Arg Ala Ser Ala Leu Pro Ala 115 120 125 Pro Pro Thr Gly Ser Ala Leu Pro Asp Pro Gin Thr Ala Ser Ala Leu 130 135 140 Pro Asp Pro Pro Ala Ala Ser Ala Leu Pro 145 150 (2) INFORMATION FOR SEQ ID NO:8: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 79 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:8: His Lys Asp Glu Val He Lys Glu Val Gin Glu Phe Tyr Lys Asp Thr 1 5 10 15 Tyr Aen Lys Leu Lys Thr Lye Asp Glu Pro Gin Arg Glu Thr Leu Lys 20 25 30 Ala He His Tyr Ala Leu Asn Cys Cys Gly Leu Ala Gly Gly Val Ala 35 40 45 Gin Phe He Ser Asp He Cys Pro Lye Lye Asp Val Leu Glu Thr Phe 50 55 60 Thr Val Lys Ser Cys Pro Asp He Lys Glu Val Phe Asp Asn Lys 65 70 75 (2) INFORMATION FOR SEQ ID NO:9: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1065 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:9: Tyr Asn Leu Asp Val Arg Gly Ala Arg Ser Phe Ser Pro Pro Arg Ala 1 5 10 15 Gly Arg His Phe Gly Tyr Arg Val Leu Gin Val Gly Asn Gly Val He 20 25 30 Val Gly Ala Pro Gly Glu Gly Asn Ser Thr Gly Ser Leu Tyr Gin Cys 35 40 45 Gin Ser Gly Thr Gly His Cys Leu Pro Val Thr Leu Arg Gly Ser Asn 50 55 60 Tyr Thr Ser Lye Tyr Leu Gly Met Thr Leu Ala Thr Aβp Pro Thr Aep 65 70 75 80 Gly Ser He Leu Ala Cys Aβp Pro Gly Leu Ser Arg Thr Cys Aβp Gin 85 90 95 Asn Thr Tyr Leu Ser Gly Leu Cyβ Tyr Leu Phe Arg Gin Asn Leu Gin 100 105 110 Gly Pro Met Leu Gin Gly Arg Pro Gly Phe Gin Glu Cys He Lys Gly 115 120 125 Asn Val Asp Leu Val Phe Leu Phe Asp Gly Ser Met Ser Leu Gin Pro 130 135 140 Aep Glu Phe Gin Lys He Leu Asp Phe Met Lys Aep Val Met Lye Lye 145 150 155 160 Leu Ser Aβn Thr Ser Tyr Gin Phe Ala Ala Val Gin Phe Ser Thr Ser 165 170 175 Tyr Lya Thr Glu Phe Asp Phe Ser Asp Tyr Val Lye Trp Lys Asp Pro 180 185 190 Asp Ala Leu Leu Lys His Val Lys His Met Leu Leu Leu Thr Asn Thr 195 200 205 Phe Gly Ala He Aβn Tyr Val Ala Thr Glu Val Phe Arg Glu Glu Leu 210 215 220 Gly Ala Arg Pro Aβp Ala Thr Lys Val Leu He He He Thr Aβp Gly 225 230 235 240 Glu Ala Thr Aβp Ser Gly Aβn He Aβp Ala Ala Lye Aep He He Arg 245 250 255 Tyr He He Gly He Gly Lye His Phe Gin Thr Lys Glu Ser Gin Glu 260 265 270 Thr Leu His Lys Phe Ala Ser Lye Pro Ala Ser Glu Phe Val Lya He 275 280 285 Leu Aβp Thr Phe Glu Lye Leu Lys Asp Leu Phe Thr Glu Leu Gin Lys 290 295 300 Lys He Tyr Val He Glu Gly Thr Ser Lys Gin Asp Leu Thr Ser Phe 305 310 315 320 Asn Met Glu Leu Ser Ser Ser Gly He Ser Ala Asp Leu Ser Arg Gly 325 330 335 His Ala Val Val Gly Ala Val Gly Ala Lys Asp Trp Ala Gly Gly Phe 340 345 350 Leu Asp Leu Lys Ala Asp Leu Gin Asp Asp Thr Phe He Gly Aβn Glu 355 360 365 Pro Leu Thr Pro Glu Val Arg Ala Gly Tyr Leu Gly Tyr Thr Val Thr 370 375 380 Trp Leu Pro Ser Arg Gin Lye Thr Ser Leu Leu Ala Ser Gly Ala Pro 385 390 395 400 Arg Tyr Gin His Met Gly Arg Val Leu Leu Phe Gin Glu Pro Gin Gly 405 410 415 Gly Gly Hie Trp Ser Gin Val Gin Thr He His Gly Thr Gin He Gly 420 425 430 Ser Tyr Phe Gly Gly Glu Leu Cyβ Gly Val Asp Val Aβp Gin Aβp Gly 435 440 445 Glu Thr Glu Leu Leu Leu Leu He Gly Ala Pro Leu Phe Tyr Gly Glu 450 455 460 Gin Arg Gly Gly Arg Val Phe He Tyr Gin Arg Arg Gin Leu Gly Phe 465 470 475 480 Glu Glu Val Ser Glu Leu Gin Gly Aep Pro Gly Tyr Pro Leu Gly Arg 485 490 495 Phe Gly Glu Ala He Thr Ala Leu Thr Asp He Asn Gly Asp Gly Leu 500 505 510 Val Asp Val Ala Val Gly Ala Pro Leu Glu Glu Gin Gly Ala Val Tyr 515 520 525 He Phe Aβn Gly Arg His Gly Gly Leu Ser Pro Gin Pro Ser Gin Arg 530 535 540 He Glu Gly Thr Gin Val Leu Ser Gly He Gin Trp Phe Gly Arg Ser 545 550 555 560 He Hie Gly Val Lye Asp Leu Glu Gly Asp Gly Leu Ala Asp Val Ala 565 570 575 Val Gly Ala Glu Ser Gin Met He Val Leu Ser Ser Arg Pro Val Val 580 585 590 Asp Met Val Thr Leu Met Ser Phe Ser Pro Ala Glu He Pro Val His 595 600 605 Glu Val Glu Cys Ser Tyr Ser Thr Ser Asn Lys Met Lys Glu Gly Val 610 615 620 Asn He Thr He Cys Phe Gin He Lye Ser Leu Tyr Pro Gin Phe Gin 625 630 635 640 Gly Arg Leu Val Ala Asn Leu Thr Tyr Thr Leu Gin Leu Asp Gly His 645 650 655 Arg Thr Arg Arg Arg Gly Leu Phe Pro Gly Gly Arg His Glu Leu Arg 660 665 670 Arg Asn He Ala Val Thr Thr Ser Met Ser Cys Thr Asp Phe Ser Phe 675 680 685 His Phe Pro Val Cys Val Gin Asp Leu He Ser Pro He Aβn Val Ser 690 695 700 Leu Aβn Phe Ser Leu Trp Glu Glu Glu Gly Thr Pro Arg Aβp Gin Arg 705 710 715 720 Ala Gin Gly Lye Aep He Pro Pro He Leu Arg Pro Ser Leu His Ser 725 730 735 Glu Thr Trp Glu He Pro Phe Glu Lys Asn Cyβ Gly Glu Asp Lye Lys 740 745 750 Cys Glu Ala Asn Leu Arg Val Ser Phe Ser Pro Ala Arg Ser Arg Ala 755 760 765 Leu Arg Leu Thr Ala Phe Ala Ser Leu Ser Val Glu Leu Ser Leu Ser 770 775 780 Asn Leu Glu Glu Asp Ala Tyr Trp Val Gin Leu Aep Leu Hie Phe Pro 785 790 795 800 Pro Gly Leu Ser Phe Arg Lys Val Glu Met Leu Lys Pro His Ser Gin 805 810 815 He Pro Val Ser Cyβ Glu Glu Leu Pro Glu Glu Ser Arg Leu Leu Ser 820 825 830 Arg Ala Leu Ser Cys Asn Val Ser Ser Pro He Phe Lys Ala Gly Hie 835 840 845 Ser Val Ala Leu Gin Met Asn Phe Asn Thr Leu Val Asn Ser Ser Trp 850 855 860 Gly Aβp Ser Val Glu Leu His Ala Aβn Val Thr Cyβ Aβn Asn Glu Aβp 865 870 875 880 Ser Aβp Leu Leu Glu Aβp Aβn Ser Ala Thr Thr He He Pro He Leu 885 890 895 Tyr Pro He Aβn He Leu He Gin Asp Gin Glu Asp Ser Thr Leu Tyr 900 905 910 val Ser Phe Thr Pro Lys Gly Pro Lys He His Gin Val Lys Hie Met 915 920 925 Tyr Gin Val Arg He Gin Pro Ser He Hie Asp His Asn He Pro Thr 930 935 940 Leu Glu Ala Val Val Gly Val Pro Gin Pro Pro Ser Glu Gly Pro He 945 950 955 960 Thr His Gin Trp Ser Val Gin Met Glu Pro Pro Tyr Pro Cyβ Hie Tyr 965 970 975 Glu Aβp Leu Glu Arg Leu Pro Asp Ala Ala Glu Pro Cys Leu Pro Gly 980 985 990 Ala Leu Phe Arg Cye Pro Val Val Phe Arg Gin Glu He Leu Val Gin 995 1000 1005 Val He Gly Thr Leu Glu Leu Val Gly Glu He Glu Ala Ser Ser Met 1010 1015 1020 Phe Ser Leu Cyβ Ser Ser Leu Ser He Ser Phe Aen Ser Ser Lys Hie 1025 1030 1035 1040 Phe His Leu Tyr Gly Ser Asn Ala Ser Leu Ala Gin Val Val Met Lye 1045 1050 1055 Val Asp Val Val Tyr Glu Lys Gin Met 1060 1065 (2) INFORMATION FOR SEQ ID NO:10: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 676 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:10: Gin Glu Cys Thr Lys Phe Lys Val Ser Ser Cys Arg Glu Cys He Glu 1 5 10 15 Ser Gly Pro Gly Cys Thr Trp Cys Gin Lys Leu Asn Phe Thr Gly Pro 20 25 30 Gly Asp Pro Aβp Ser He Arg Cys Asp Thr Arg Pro Gin Leu Leu Met 35 40 45 Arg Gly Cys Ala Ala Asp Asp He Met Asp Pro Thr Ser Leu Ala Glu 50 55 60 Thr Gin Glu Aep Hie Asn Gly Gly Gin Lys Gin Leu Ser Pro Gin Lys 65 70 75 80 Val Thr Leu Tyr Leu Arg Pro Gly Gin Ala Ala Ala Phe Asn Val Thr 85 90 95 Phe Arg Arg Ala Lys Gly Tyr Pro He Asp Leu Tyr Tyr Leu Met Aep 100 105 HO Leu Ser Tyr Ser Met Leu Aβp Aβp Leu Arg Asn Val Lye Lye Leu Gly 115 120 125 Gly Aep Leu Leu Arg Ala Leu Aβn Glu He Thr Glu Ser Gly Arg He 130 135 140 Gly Phe Gly Ser Phe Val Aep Lye Thr Val Leu Pro Phe Val Aβn Thr 145 150 155 160 Hie Pro Asp Lys Leu Arg Aβn Pro Cyβ Pro Aβn Lys Glu Lys Glu Cys 165 170 175 Gin Pro Pro Phe Ala Phe Arg Hie Val Leu Lye Leu Thr Aβn Aβn Ser 180 185 190 Aβn Gin Phe Gin Thr Glu Val Gly Lye Gin Leu He Ser Gly Aen Leu 195 200 205 Aep Ala Pro Glu Gly Gly Leu Aβp Ala Met Met Gin Val Ala Ala Cye 210 215 220 Pro Glu Glu He Gly Aβn Arg Asn Val Thr Arg Leu Leu Val Phe Ala 225 230 235 240 Thr Asp Asp Gly Phe His Phe Ala Gly Asp Gly Lys Leu Gly Ala He 245 250 255 Leu Thr Pro Asn Asp Gly Arg Cys His Leu Glu Asp Aβn Leu Tyr Lye 260 265 270 Arg Ser Aβn Glu Phe Asp Tyr Pro Ser Val Gly Gin Leu Ala Hie Lye 275 280 285 Leu Ala Glu Aβn Aβn He Gin Pro He Phe Ala Val Thr Ser Arg Met 290 295 300 Val Lys Thr Tyr Glu Lye Leu Thr Glu He He Pro Lye Ser Ala Val 305 310 315 320 Gly Glu Leu Ser Glu Asp Ser Ser Asn Val Val Hie Leu He Lye Asn 325 330 335 Ala Tyr Aβn Lys Leu Ser Ser Arg Val Phe Leu Asp His Asn Ala Leu 340 345 350 Pro Aβp Thr Leu Lye Val Thr Tyr Aβp Ser Phe Cyβ Ser Aβn Gly Val 355 360 365 Thr His Arg Asn Gin Pro Arg Gly Asp Cyβ Aβp Gly Val Gin He Asn 370 375 380 Val Pro He Thr Phe Gin Val Lys Val Thr Ala Thr Glu Cys He Gin 385 390 395 400 Glu Gin Ser Phe Val He Arg Ala Leu Gly Phe Thr Asp He Val Thr 405 410 415 Val Gin Val Leu Pro Gin Cys Glu Cys Arg Cys Arg Asp Gin Ser Arg 420 425 430 Asp Arg Ser Leu Cys His Gly Lys Gly Phe Leu Glu Cyβ Gly He Cyβ 435 440 445 Arg Cyβ Asp Thr Gin Tyr He Gly Lys Asn Cyβ Glu Cys Gin Thr Gin 450 455 460 Gly Arg Ser Ser Gin Glu Leu Glu Gly Ser Cys Arg Lys Asp Aβn Aβn 465 470 475 480 Ser He He Cyβ Ser Gly Leu Gly Aβp Cys Val Cyβ Gly Gin Cyβ Leu 485 490 495 Cyβ Hie Thr Ser Asp Val Pro Gly Lys Leu He Tyr Gly Gin Tyr Cys 500 505 510 Glu Cyβ Asp Thr He Aβn Cys Glu Arg Tyr Asn Gly Gin Val Cys Gly 515 520 525 Gly Pro Gly Arg Gly Leu Cys Phe Cys Gly Lys Cys Arg Cys His Pro 530 535 540 Gly Phe Glu Gly Ser Ala Cys Gin Cys Glu Arg Thr Thr Glu Gly Cye 545 550 555 560 Leu Asn Pro Arg Arg Val Glu Cys Ser Gly Arg Gly Arg Cys Arg Cye 565 570 575 Asn Val Cys Glu Cys His Ser Gly Tyr Gin Leu Pro Leu Cys Gin Glu 580 585 590 Cys Pro Gly Cys Pro Ser Cys Gly Lya Tyr He Ser Cyβ Ala Glu Cye 595 600 605 Leu Lys Phe Glu Lye Gly Pro Phe Gly Lys Aen Cys Ser Ala Ala Cys 610 615 620 Pro Gly Leu Gin Leu Ser Asn Asn Pro Val Lys Gly Arg Thr Cys Lys 625 630 635 640 Glu Arg Asp Ser Glu Gly Cyβ Trp Val Ala Tyr Thr Leu Glu Gin Gin 645 650 655 Aβp Gly Met Aβp Arg Tyr Leu He Tyr Val Asp Glu Ser Arg Glu Cys 660 665 670 Val Ala Gly Pro 675 (2) INFORMATION FOR SEQ ID NO:11: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 169 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:11: Thr Pro Ala Pro Lys Ser Cys Pro Glu Arg His Tyr Trp Ala Gin Gly 1 5 10 15 Lys Leu Cys Cys Gin Met Cys Glu Pro Gly Thr Phe Leu Val Lys Asp 20 25 30 Cys Gin Hie Arg Lye Ala Ala Gin Cyβ Aβp Pro Cyβ He Pro Gly Val 35 40 45 Ser Phe Ser Aβp Pro His His Thr Arg Pro His Cys Glu Ser Cys Arg 50 55 60 His Cys Aen Ser Gly Leu Leu Val Arg Aen Cys He Thr Ala Asn Ala 65 70 75 80 Glu Cys Ala Cys Arg Aen Gly Trp Gin Cys Arg Aβp Lye Glu Cys Thr 85 90 95 Glu Cyβ Aβp Pro Leu Pro Asn Pro Ser Leu Thr Ala Arg Ser Ser Gin 100 105 110 Ala Leu Ser Pro His Pro Gin Pro Thr His Leu Pro Tyr Val Ser Glu 115 120 125 Met Leu Glu Ala Ser Thr Ala Gly His Met Gin Thr Leu Ala Aβp Phe 130 135 140 Arg Gin Leu Pro Ala Arg Thr Leu Ser Thr His Trp Pro Pro Gin Arg 145 150 155 160 Ser Leu Cys Ser Ser Asp Phe He Arg 165 (2) INFORMATION FOR SEQ ID NO:12: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 319 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:12: Aβp Ala Leu Gly Ser Thr Thr Ala Val Gin Thr Pro Thr Ser Gly Glu 1 5 10 15 Pro Leu Val Ser Thr Ser Glu Pro Leu Ser Ser Lye Met Tyr Thr Thr 20 25 30 Ser He Thr Ser Aβp Pro Lye Ala Asp Ser Thr Gly Asp Gin Thr Ser 35 40 45 Ala Leu Pro Pro Ser Thr Ser He Aβn Glu Gly Ser Pro Leu Trp Thr 50 55 60 Ser He Gly Ala Ser Thr Gly Ser Pro Leu Pro Glu Pro Thr Thr Tyr 65 70 75 80 Gin Glu Val Ser He Lys Met Ser Ser Val Pro Gin Glu Thr Pro His 85 90 95 Ala Thr Ser His Pro Ala Val Pro He Thr Ala Aβn Ser Leu Gly Ser 100 105 110 Hie Thr Val Thr Gly Gly Thr He Thr Thr Aβn Ser Pro Glu Thr Ser 115 120 125 Ser Arg Thr Ser Gly Ala Pro Val Thr Thr Ala Ala Ser Ser Leu Glu 130 135 140 Thr Ser Arg Gly Thr Ser Gly Pro Pro Leu Thr Met Ala Thr Val Ser 145 150 155 160 Leu Glu Thr Ser Lye Gly Thr Ser Gly Pro Pro Val Thr Met Ala Thr 165 170 175 Aep Ser Leu Glu Thr Ser Thr Gly Thr Thr Gly Pro Pro Val Thr Met 180 185 190 Thr Thr Gly Ser Leu Glu Pro Ser Ser Gly Ala Ser Gly Pro Gin Val 195 200 205 Ser Ser Val Lye Leu Ser Thr Met Met Ser Pro Thr Thr Ser Thr Aβn 210 215 220 Ala Ser Thr Val Pro Phe Aβn Pro Asp Glu Asn Ser Arg Gly Met Leu 225 230 235 240 Pro Val Ala Val Leu Val Ala Leu Leu Ala Val He Val Leu Val Ala 245 250 255 Leu Leu Leu Leu Trp Arg Arg Arg Gin Lys Arg Arg Thr Gly Ala Leu 260 265 270 Val Leu Ser Arg Gly Gly Lys Arg Aβn Gly Val Val Asp Ala Trp Ala 275 280 285 Gly Pro Ala Gin Val Pro Glu Glu Gly Ala Val Thr Val Thr Val Gly 290 295 300 Gly Ser Gly Gly Asp Lys Gly Ser Gly Phe Pro Aβp Gly Glu Gly 305 310 315 (2) INFORMATION FOR SEQ ID NO:13: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 553 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (ix) FEATURE: (A) NAME/KEY: Domain (B) LOCATION: 1..74 (D) OTHER INFORMATION: /note= "product of exon A" (ix) FEATURE: (A) NAME/KEY: Domain (B) LOCATION: 75..122 (D) OTHER INFORMATION: /note= "product of exon B" (ix) FEATURE: (A) NAME/KEY: Domain (B) LOCATION: 123..170 (D) OTHER INFORMATION: /note= "product of exon C" (xi) SEQUENCE DESCRIPTION: SEQ ID NO:13: Gin Ser Pro Thr Pro Ser Pro Thr Gly Leu Thr Thr Ala Lye Met Pro 1 5 10 15 Ser Trp Pro Leu Ser Ser Aβp Pro Leu Pro Thr Hie Thr Thr Ala Phe 20 25 30 Ser Pro Ala Ser Thr Phe Glu Arg Glu Aβn Aep Phe Ser Glu Thr Thr 35 40 45 Thr Ser Leu Ser Pro Asp Asn Thr Ser Thr Gin Val Ser Pro Asp Ser 50 55 60 Leu Aep Aen Ala Ser Ala Phe Aβn Thr Thr Gly Val Ser Ser Val Gin 65 70 75 80 Thr Pro Hie Leu Pro Thr Hie Ala Aep Ser Gin Thr Pro Ser Ala Gly 85 90 95 Thr Asp Thr Gin Thr Phe Ser Gly Ser Ala Ala Aβx Ala Lye Leu Aan 100 105 110 Pro Thr Pro Gly Ser Aβn Ala He Ser Aβp Val Pro Gly Glu Arg Ser 115 120 125 Thr Ala Ser Thr Phe Pro Thr Aep Pro Val Ser Pro Leu Thr Thr Thr 130 135 140 Leu Ser Leu Ala Hie Hie Ser Ser Ala Ala Leu Pro Ala Arg Thr Ser 145 150 155 160 Aβn Thr Thr He Thr Ala Aβn Thr Ser Aβp Ala Tyr Leu Aβn Ala Ser 165 170 175 Glu Thr Thr Thr Leu Ser Pro Ser Gly Ser Ala Val He Ser Thr Thr 180 185 190 Thr He Ser Thr Thr Pro Ser Lys Pro Thr Cys Asp Glu Lys Tyr Ala 195 200 205 Aβn He Thr Val Asp Tyr Leu Tyr Aβn Lys Glu Thr Lys Leu Phe Thr 210 215 220 Ala Lys Leu Asn Val Asn Glu Asn Val Glu Cys Gly Aβn Aβn Thr Cyβ 225 230 235 240 Thr Aβn Asn Glu Val Hie Aβn Leu Thr Glu Cys Lys Asn Ala Ser Val 245 250 255 Ser He Ser His Asn Ser Cys Thr Ala Pro Asp Lys Thr Leu He Leu 260 265 270 Asp Val Pro Pro Gly Val Glu Lye Phe Gin Leu His Asp Cys Thr Gin 275 280 285 Val Glu Lys Ala Asp Thr Thr He Cys Leu Lys Trp Lys Aβn He Glu 290 295 300 Thr Phe Thr Cyβ Asp Thr Gin Asn He Thr Tyr Arg Phe Gin Cys Gly 305 310 315 320 Asn Met He Phe Asp Asn Lys Glu He Lys Leu Glu Asn Leu Glu Pro 325 330 335 Glu His Glu Tyr Lys Cys Asp Ser Glu He Leu Tyr Asn Aen His Lye 340 345 350 Phe Thr Aβn Ala Ser Lys He He Lys Thr Aep Phe Gly Ser Pro Gly 355 360 365 Glu Pro Gin He He Phe Cys Arg Ser Glu Ala Ala His Gin Gly Val 370 375 380 He Thr Trp Aβn Pro Pro Gin Arg Ser Phe His Aen Phe Thr Leu Cyβ 385 390 395 400 Tyr He Lye Glu Thr Glu Lye Aep Cyβ Leu Asn Leu Asp Lys Asn Leu 405 410 415 He Lys Tyr Aep Leu Gin Aβn Leu Lye Pro Tyr Thr Lys Tyr Val Leu 420 425 430 Ser Leu His Ala Tyr He He Ala Lys Val Gin Arg Aen Gly Ser Ala 435 440 445 Ala Met Cys Hie Phe Thr Thr Lys Ser Ala Pro Pro Ser Gin Val Trp 450 455 460 Asn Met Thr Val Ser Met Thr Ser Asp Asn Ser Met His Val Lys Cyβ 465 470 475 480 Arg Pro Pro Arg Aβp Arg Aβn Gly Pro His Glu Arg Tyr His Leu Glu 485 490 495 Val Glu Ala Gly Asn Thr Lys Val Arg Asn Glu Ser Hie Lys Asn Cye 500 505 510 Asp Phe Arg Val Lys Aep Leu Gin Tyr Ser Thr Aβp Tyr Thr Phe Lye 515 520 525 Ala Tyr Phe Hie Asn Gly Asp Tyr Pro Gly Glu Pro Phe He Leu His 530 535 540 His Ser Thr Ser Tyr Aen Ser Lye Ala 545 550 (2) INFORMATION FOR SEQ ID NO:14: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 194 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:14: Gin Gly His Leu Val His Met Thr Val Val Ser Gly Ser Asn Val Thr 1 5 10 15 Leu Asn He Ser Glu Ser Leu Pro Glu Asn Tyr Lys Gin Leu Thr Trp 20 25 30 Phe Tyr Thr Phe Aep Gin Lys He Val Glu Trp Asp Ser Arg Lys Ser 35 40 45 Lys Tyr Phe Glu Ser Lys Phe Lys Gly Arg Val Arg Leu Asp Pro Gin 50 55 60 Ser Gly Ala Leu Tyr He Ser Lys Val Gin Lys Glu Asp Asn Ser Thr 65 70 75 80 Tyr He Met Arg Val Leu Lys Lys Thr Gly Asn Glu Gin Glu Trp Lys 85 90 95 He Lys Leu Gin Val Leu Asp Pro Val Pro Lys Pro Val He Lys He 100 105 110 Glu LyB He Glu Asp Met Asp Asp Asn Cys Tyr Leu Lys Leu Ser Cyβ 115 120 125 Val He Pro Gly Glu Ser Val Asn Tyr Thr Trp Tyr Gly Aβp Lye Arg 130 135 140 Pro Phe Pro Lye Glu Leu Gin Asn Ser Val Leu Glu Thr Thr Leu Met 145 150 155 160 Pro His Asn Tyr Ser Arg Cys Tyr Thr Cys Gin Val Ser Asn Ser Val 165 170 175 Ser Ser Lye Aβn Gly Thr Val Cys Leu Ser Pro Pro Cys Thr Leu Ala 180 185 190 Arg Ser (2) INFORMATION FOR SEQ ID NO:15: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 208 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:15: Val He His Val Thr Lys Glu Val Lys Glu Val Ala Thr Leu Ser Cys 1 5 10 15 Gly His Asn Val Ser Val Glu Glu Leu Ala Gin Thr Arg He Tyr Trp 20 25 30 Gin Lys Glu Lye Lye Met Val Leu Thr Met Met Ser Gly Asp Met Aβn 35 40 45 He Trp Pro Glu Tyr Lye Asn Arg Thr He Phe Aep He Thr Aβn Aβn 50 55 60 Lye Ser He Val He Leu Ala Leu Arg Pro Ser Asp Glu Gly Thr Tyr 65 70 75 80 Glu Cys Val Val Leu Lys Tyr Glu Lys Aβp Ala Phe Lye Arg Glu Hie 85 90 95 Leu Ala Glu Val Thr Leu Ser Val Lye Ala Asp Phe Pro Thr Pro Ser 100 105 HO He Ser Aep Phe Glu He Pro Thr Ser Aβn He Arg Arg He He Cyβ 115 120 125 Ser Thr Ser Gly Gly Phe Pro Glu Pro His Leu Ser Trp Leu Lye Arg 130 135 140 Glu His Leu Ala Glu Val He Asn Thr Thr Val Ser Gin Asp Pro Glu 145 150 155 160 Thr Glu Leu Tyr Ala Val Ser Ser Lys Leu Aβp Phe Asn Met Thr Thr 165 170 175 Asn His Ser Phe Met Cys Leu He Lys Tyr Gly His Leu Arg Val Asn 180 185 190 Gin Thr Phe Asn Trp Aβn Thr Thr Lys Gin Glu His Phe Pro Asp Aβn 195 200 205 (2) INFORMATION FOR SEQ ID NO:16: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 74 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:16: Met Lys Ser Phe Leu Leu Phe Leu Thr He He Leu Leu Val Val He 1 5 10 15 Gin He Gin Thr Gly Ser Leu Gly Gin Ala Thr Thr Ala Ala Ser Gly 20 25 30 Thr Asn Lys Aβn Ser Thr Ser Thr Lye Lye Thr Pro Leu Lys Ser Gly 35 40 45 Ala Ser Ser He He Aβp Ala Gly Ala Cye Ser Phe Leu Phe Phe Ala 50 55 60 Aβn Thr Leu Met Cye Leu Phe Tyr Leu Ser 65 70 (2) INFORMATION FOR SEQ ID NO:17: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 410 amino acidβ (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:17: Aβn Lys Val Val Leu Gly Lys Lye Gly Aβp Thr Val Glu Leu Thr Cyβ 1 5 10 15 Thr Ala Ser Gin Lye Lye Ser He Gin Phe Hie Trp Lye Aβn Ser Aβn 20 25 30 Gin He Lys He Leu Gly Asn Gin Gly Ser Phe Leu Thr Lys Gly Pro 35 40 45 Ser Lya Leu Asn Asp Arg Ala Asp Ser Arg Arg Ser Leu Trp Asp Gin 50 55 60 Gly Asn Phe Pro Leu He He Lys Asn Leu Lys He Glu Asp Ser Aβp 65 70 75 80 Thr Tyr He Cyβ Glu Val Glu Aβp Gin Lys Glu Glu Val Gin Leu Leu 85 90 95 Val Phe Gly Leu Thr Ala Asn Ser Asp Thr His Leu Leu Gin Gly Gin 100 105 110 Ser Leu Thr Leu Thr Leu Glu Ser Pro Pro Gly Ser Ser Pro Ser Val 115 120 125 Gin Cys Arg Ser Pro Arg Gly Lys Asn He Gin Gly Gly Lye Thr Leu 130 135 140 Ser Val Ser Gin Leu Glu Leu Gin Aep Ala Gly Thr Trp He Cys Thr 145 150 155 160 Val Leu Gin Asn Gin Lys Lys Val Glu Phe Lys He Aβp He Val Val 165 170 175 Leu Ala Glu Pro Arg Gly Pro Thr He Lye Pro Cyβ Pro Pro Cyβ Lye 180 185 190 Cyβ Pro Ala Pro Aβn Leu Leu Gly Gly Pro Ser Val Phe He Phe Pro 195 200 205 Pro Lys He Lys Aβp Val Leu Met He Ser Leu Ser Pro He Val Thr 210 215 220 Cys Val Val Val Aβp Val Ser Glu Asp Asp Pro Asp Val Gin He Ser 225 230 235 240 Trp Phe Val Aβn Aβn Val Glu Val Hie Thr Ala Gin Thr Gin Thr His 245 250 255 Arg Glu Aβp Tyr Aβn Ser Arg Leu Arg Val Val Ser Ala Leu Pro He 260 265 270 Gin Hie Gin Aβp Trp Met Ser Gly Lye Glu Phe Lys Cye Lys Val Asn 275 280 285 Asn Lye Aβp Leu Pro Ala Pro He Glu Arg Thr He Ser Lys Pro Lye 290 295 300 Gly Ser Val Arg Ala Pro Gin Val Tyr Val Leu Pro Pro Pro Glu Glu 305 310 315 320 Met Thr Lye Lys Gin Val Thr Leu Thr Cys Met Val Thr Aβp Phe Met 325 330 335 Pro Glu Aβp He Tyr Val Glu Trp Thr Asn Asn Gly Lys Thr Glu Leu 340 345 350 Aβn Tyr Lye Aβn Thr Glu Pro Val Leu Aβp Ser Aβp Gly Ser Tyr Phe 355 360 365 Met Tyr Ser Lye Leu Arg Val Glu Lys Lys Asn Trp Val Glu Arg Aβn 370 375 380 Ser Tyr Ser Cyβ Ser Val Val Hie Glu Gly Leu Hie Aβn Hie Hie Thr 385 390 395 400 Thr Lys Ser Phe Ser Arg Thr Pro Gly Lys 405 410 (2) INFORMATION FOR SEQ ID NO:18: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 418 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:18: Lys Glu He Thr Asn Ala Leu Glu Thr Trp Gly Ala Leu Gly Gin Asp 1 5 10 15 He Asn Leu Aβp He Pro Ser Phe Gin Met Ser Aβp Aβp He Asp Asp 20 25 30 He Lys Trp Glu Lys Thr Ser Asp Lys Lys Lys He Ala Gin Phe Arg 35 40 45 Lys Glu Lys Glu Thr Phe Lys Glu Lys Asp Thr Tyr Lys Leu Phe Lys 50 55 60 Aβn Gly Thr Leu Lys He Lye His Leu Lys Thr Asp Aβp Gin Aβp He 65 70 75 80 Tyr Lys Val Ser He Tyr Aβp Thr Lye Gly Lys Aβn Val Leu Glu Lye 85 90 95 He Phe Aβp Leu Lys He Gin Glu Arg Val Ser Lys Pro Lys He Ser 100 105 110 Trp Thr Cys He Asn Thr Thr Leu Thr Cys Glu Val Met Asn Gly Thr 115 120 125 Asp Pro Glu Leu Asn Leu Tyr Gin Asp Gly Lys His Leu Lys Leu Ser 130 135 140 Gin Arg Val He Thr His Lye Trp He Thr Ser Leu Ser Ala Lye Phe 145 150 155 160 Lye Cys Thr Ala Gly Asn Lys Val Ser Lys Glu Ser Ser Val Glu Pro 165 170 175 Val Ser Cys Pro Glu Lye Gly Leu Aβp Glu Pro Arg Gly Pro Thr He 180 185 190 Lye Pro Cys Pro Pro Cys Lys Cys Pro Ala Pro Asn Leu Leu Gly Gly 195 200 205 Pro Ser Val Phe He Phe Pro Pro Lys He Lys Asp Val Leu Met He 210 215 220 Ser Leu Ser Pro He Val Thr Cys Val Val Val Asp Val Ser Glu Asp 225 230 235 240 Asp Pro Asp Val Gin He Ser Trp Phe Val Aβn Aen Val Glu Val His 245 250 255 Thr Ala Gin Thr Ala Thr His Arg Glu Aβp Tyr Aβn Ser Thr Leu Arg 260 265 270 Val Val Ser Ala Leu Pro He Gin Hie Gin Aβp Trp Met Ser Gly Lye 275 280 285 Glu Phe Lys Cys Lye Val Aβn Aβn Lys Aβp Leu Pro Ala Pro He Glu 290 295 300 Glu Thr He Ser Lye Pro Lye Gly Ser Val Arg Ala Pro Gin Val Tyr 305 310 315 320 Val Leu Pro Pro Pro Glu Glu Glu Met Thr Lye Lye Gin Val Thr Leu 325 330 335 Thr Cyβ Met Val Thr Aβp Phe Aβn Pro Glu Aβp He Tyr Val Glu Trp 340 345 350 Thr Aβn Aβn Gly Lye Thr Glu Leu Aβn Tyr Lye Aβn Thr Glu Pro Val 355 360 365 Leu Asp Ser Aβp Gly Ser Tyr Phe Met Tyr Ser Lye Leu Arg Val Glu 370 375 380 Lye Lye Asn Trp Val Glu Arg Asn Ser Tyr Ser Cye Ser Val Val His 385 390 395 400 Glu Gly Leu Hie Aβn Hie Hie Thr Thr Lye Ser Phe Ser Arg Thr Pro 405 410 415 Gly Lys (2) INFORMATION FOR SEQ ID NO:19: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 367 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:19: Aβn Lys He Leu Val Lys Gin Ser Pro Met Leu Val Ala Tyr Aep Aen 1 5 10 15 Ala Val Aen Leu Ser Cyβ Lye Tyr Ser Tyr Aen Leu Phe Ser Arg Glu 20 25 30 Phe Arg Ala Ser Leu Hie Lys Gly Leu Asp Ser Ala Val Glu Val Cyβ 35 40 45 Val Val Tyr Gly Aβn Tyr Ser Gin Gin Leu Gin Val Tyr Ser Lys Thr 50 55 60 Gly Phe Aen Cys Asp Gly Lye Leu Gly Asn Glu Ser Val Thr Phe Tyr 65 70 75 80 Leu Gin Asn Leu Tyr Tyr Asn Gin Thr Asp He Tyr Phe Cys Lye He 85 90 95 Glu Tyr Met Tyr Pro Pro Pro Tyr Leu Asp Asn Glu Lys Ser Asn Gly 100 105 110 Thr He He His Val Lys Gly Lye Hie Leu Cyβ Pro Ser Pro Leu Phe 115 120 125 Pro Gly Pro Ser Lys Pro Glu Pro Arg Gly Pro Thr He Lye Pro Cye 130 135 140 Pro Pro Cys Lye Cye Pro Ala Pro Asn Leu Leu Gly Gly Pro Ser Val 145 150 155 160 Phe He Phe Pro Pro Lys He Lys Asp Val Leu Met He Ser Leu Ser 165 170 175 Pro He Val Thr Cys Val Val Val Asp Val Ser Glu Aβp Asp Pro Asp 180 185 190 Val Gin He Ser Trp Phe Val Asn Aen Val Glu Val Hie Thr Ala Gin 195 200 205 Thr Gin Thr Hie Arg Glu Aβp Tyr Aβn Ser Thr Leu Arg Val Val Ser 210 215 220 Ala Leu Pro He Gin Hie Gin Aep Trp Met Ser Gly Lys Glu Phe Lys 225 230 235 240 Cye Lye Val Asn Aβn Lye Asp Leu Pro Ala Pro He Glu Arg Thr He 245 250 255 Ser Lys Pro Lye Gly Ser Val Arg Ala Pro Gin Val Tyr Val Leu Pro 260 265 270 Pro Pro Glu Glu Glu Met Thr Lys Lys Gin Val Thr Leu Thr Cys Met 275 280 285 Val Thr Asp Phe Met Pro Glu Aβp He Tyr Val Glu Trp Thr Aβn Aβn 290 295 300 Gly Lye Thr Glu Leu Aβn Tyr Lye Aβn Thr Glu Pro Val Leu Asp Ser 305 310 315 320 Asp Gly Ser Tyr Phe Met Tyr Ser Lys Leu Arg Val Glu Lys Lys Asn 325 330 335 Trp Val Glu Arg Asn Ser Tyr Ser Cys Ser Val Val His Glu Gly Leu 340 345 350 His Aβn Hie Hie Thr Thr Lye Ser Phe Ser Arg Thr Pro Gly Lye 355 360 365 (2) INFORMATION FOR SEQ ID NO:20: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 357 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:20: Met His Val Ala Gin Pro Ala Val Val Leu Ala Ser Ser Arg Gly He 1 5 10 15 Ala Ser Phe Val Cyβ Glu Tyr Ala Ser Pro Gly Lye Ala Thr Glu Val 20 25 30 Arg Val Thr Val Leu Arg Gin Ala Asp Ser Gin Val Thr Glu Val Cys 35 40 45 Ala Ala Thr Tyr Met Met Gly Asn Glu Leu Thr Phe Leu Aβp Aβp Ser 50 55 60 He Cya Thr Gly Thr Ser Ser Gly Aen Gin Val Aβn Leu Thr He Gin 65 70 75 80 Gly Leu Arg Ala Met Aβp Thr Gly Leu Tyr He Cyβ Lys Val Glu Leu 85 90 95 Met Tyr Pro Pro Pro Tyr Tyr Leu Gly He Gly Asn Gly Ala Gin He 100 105 110 Tyr Val He Asp Pro Glu Pro Cys Pro Asp Ser Aβp Glu Pro Arg Gly 115 120 125 Pro Thr He Lys Pro Cys Pro Pro Cys Lys Cys Pro Ala Pro Aβn Leu 130 135 140 Leu Gly Gly Pro Ser Val Phe He Phe Pro Pro Lye He Lys Asp Val 145 150 155 160 Leu Met He Ser Leu Ser Pro He Val Thr Cys Val Val Val Asp Val 165 170 175 Ser Glu Asp Asp Leu Asp Val Gin He Ser Trp Phe Val Asn Asn Val 180 185 190 Glu Val Hie Thr Ala Gin Thr Gin Thr Hie Arg Glu Asp Tyr Asn Ser 195 200 205 Thr Leu Arg Val Val Ser Ala Leu Pro He Gin His Gin Asp Trp Met 210 215 220 Ser Gly Lye Glu Phe Lys Cys Lys Val Asn Asn Lye Aep Leu Pro Ala 225 230 235 240 Pro He Glu Arg Thr He Ser Lye Pro Lys Gly Ser Val Arg Ala Pro 245 250 255 Gin Val Tyr Val Leu Pro Pro Pro Glu Glu Glu Met Thr Lys Lye Gin 260 265 270 Val Thr Leu Thr Cys Met Val Thr Asp Phe Met Pro Glu Asp He Tyr 275 280 285 Val Glu Trp Thr Asn Asn Gly Lys Thr Glu Leu Asn Tyr Lys Asn Thr 290 295 300 Glu Pro Val Leu Asp Ser Asp Gly Ser Tyr Phe Met Tyr Ser Lys Leu 305 310 315 320 Arg Val Glu Lys Lys Aβn Trp Val Glu Arg Asn Ser Tyr Ser Cys Ser 325 330 335 Val Val His Glu Gly Leu Hie Aβn His His Thr Thr Lys Ser Phe Ser 340 345 350 Arg Thr Pro Gly Lys 355 (2) INFORMATION FOR SEQ ID NO:21: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 378 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO:21: Pro Pro Glu Lys Lys Glu Leu Arg Lys Val Ala His Leu Thr Gly Lys 1 5 10 15 Ser Asn Ser Arg Ser Met Pro Leu Glu Trp Glu Asp Thr Tyr Gly He 20 25 30 Val Leu Leu Ser Gly Val Lys Tyr Lys Lys Gly Gly Leu Val He Aen 35 40 45 Glu Thr Gly Leu Tyr Phe Val Tyr Ser Lys Val Tyr Phe Arg Gly Gin 50 55 60 Ser Cyβ Asn Asn Leu Pro Leu Ser His Lys Val Tyr Met Arg Asn Ser 65 70 75 80 Lye Tyr Pro Gin Aβp Leu Val Met Met Glu Gly Lye Met Met Ser Tyr 85 90 95 Cyβ Thr Thr Gly Gin Met Trp Ala Arg Ser Ser Tyr Lye Gly Ala Val 100 105 110 Phe Aβn Leu Thr Ser Ala Aβp Hie Leu Tyr Val Aβn Val Ser Glu Leu 115 120 125 Ser Leu Val Aβn Phe Glu Glu Ser Gin Thr Phe Phe Gly Leu Tyr Lye 130 135 140 Leu Glu Pro Arg Gly Pro Thr He Lys Pro Cya Pro Pro Cys Lys Cyβ 145 150 155 160 Pro Ala Pro Aβn Leu Leu Gly Gly Pro Ser Val Phe He Phe Pro Pro 165 170 175 Lye He Lye Aep Val Leu Met He Ser Leu Ser Pro He Val Thr Cye 180 185 190 Val Val Val Aβp Val Ser Glu Aβp Aβp Pro Aβp Val Gin He Ser Trp 195 200 205 Phe Val Asn Aen Val Glu Val Hie Thr Ala Gin Thr Gin Thr Hie Arg 210 215 220 Glu Asp Tyr Asn Ser Thr Leu Arg Val Val Ser Ala Leu Pro He Gin 225 230 235 240 His Gin Aβp Trp Met Ser Gly Lye Glu Phe Lys Cye Lye Val Aβn Aβn 245 250 255 Lye Aβp Leu Pro Ala Pro He Glu Arg Thr He Ser Lye Pro Lye Gly 260 265 270 Ser Val Arg Ala Pro Gin Val Tyr Val Leu Pro Pro Pro Glu Glu Glu 275 280 285 Met Thr Lye Lye Gin Val Thr Leu Thr Cyβ Met Val Thr Aβp Phe Met 290 295 300 Pro Glu Aβp He Tyr Val Glu Trp Thr Aβn Aen Gly Lys Thr Glu Leu 305 310 315 320 Asn Tyr Lys Asn Thr Glu Pro Val Leu Asp Ser Asp Gly Ser Tyr Phe 325 330 335 Met Tyr Ser Lys Leu Arg Val Glu Lys Lys Aen Trp Val Glu Arg Asn 340 345 350 ser Tyr Ser Cys Ser Val Val His Glu Gly Leu Hie Aen Hie Hie Thr 355 360 365 Thr Lys Ser Phe Ser Arg Thr Pro Gly Lys 370 375 (2) INFORMATION FOR SEQ ID NO:22: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 33 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (ix) FEATURE: (A) NAME/KEY: miβc_feature (B) LOCATION: 1..33 (D) OTHER INFORMATION: /labels primer (xi) SEQUENCE DESCRIPTION: SEQ ID NO:22: CGCTCTAGAA TGAGCTTTCC ATGTAAATTT GTA 33 (2) INFORMATION FOR SEQ ID NO:23: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 36 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: βingle (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (ix) FEATURE: (A) NAME/KEY: miβc_feature (B) LOCATION: 1..36 (D) OTHER INFORMATION: /label= primer (xi) SEQUENCE DESCRIPTION: SEQ ID NO:23: TGTGGGCCCT CTGGGCTCGT CCAGACCTTT CTCTGG 36 (2) INFORMATION FOR SEQ ID NO:24: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 27 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (ix) FEATURE: (A) NAME/KEY: miβc feature (B) LOCATION: 1..27 (D) OTHER INFORMATION: /label- primer (xi) SEQUENCE DESCRIPTION: SEQ ID NO:24: CGCTCTAGAA TGAACCGGGG AGTCCCT 27 (2) INFORMATION FOR SEQ ID NO:25: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 34 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (ix) FEATURE: (A) NAME/KEY: miβc_feature (B) LOCATION: 1..34 (D) OTHER INFORMATION: /label= primer (xi) SEQUENCE DESCRIPTION: SEQ ID NO:25: GGGCCCTCTG GGCTCAGCTA GCACCACGAT GTCT 34 (2) INFORMATION FOR SEQ ID NO:26: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 35 baβe pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (ix) FEATURE: (A) NAME/KEY: miβc_feature (B) LOCATION: 1..35 (D) OTHER INFORMATION: /label= primer (xi) SEQUENCE DESCRIPTION: SEQ ID NO:26: CCAGAGAAAG GTCTGGACGA GCCCAGAGGG CCCAC 35 (2) INFORMATION FOR SEQ ID NO:27: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 34 baee pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (ix) FEATURE: (A) NAME/KEY: miβc_feature (B) LOCATION: 1..34 (D) OTHER INFORMATION: /label* primer (xi) SEQUENCE DESCRIPTION: SEQ ID NO:27: AGACATCGTG GTGCTAGCTG AGCCCAGAGG GCCC 34 (2) INFORMATION FOR SEQ ID NO:28: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 33 baee pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (ix) FEATURE: (A) NAME/KEY: miβc_feature (B) LOCATION: 1..33 (D) OTHER INFORMATION: /label= primer (xi) SEQUENCE DESCRIPTION: SEQ ID NO:28: GGCGAATTCT TTACCCGGAG TCCGGGAGAA GCT 33 (2) INFORMATION FOR SEQ ID NO:29: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 25 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..25 (D) OTHER INFORMATION: /label= leader (xi) SEQUENCE DESCRIPTION: SEQ ID NO:29: Met Aβn Arg Gly Val Pro Phe Arg Hie Leu Leu Leu Val Leu Gin Leu 1 5 10 15 Ala Leu Leu Pro Ala Ala Thr Gin Gly 20 25 (2) INFORMATION FOR SEQ ID NO:30: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 24 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (i ) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..24 (D) OTHER INFORMATION: /label= leader (xi) SEQUENCE DESCRIPTION: SEQ ID NO:30: Met Ser Phe Pro Cye Lys Phe Val Ala Ser Phe Leu Leu He Phe Asn 1 5 10 15 Val Ser Ser Lye Gly Ala Val Ser 20 (2) INFORMATION FOR SEQ ID NO:31: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 18 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..18 (D) OTHER INFORMATION: /label= leader (xi) SEQUENCE DESCRIPTION: SEQ ID NO:31: Met Leu Arg Leu Leu Leu Ala Leu Asn Leu Phe Pro Ser He Gin Val 1 5 10 15 Thr Gly (2) INFORMATION FOR SEQ ID NO:32: (i) SEQUENCE CHARACTERISTICS: (A) LENCTH: 37 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..37 (D) OTHER INFORMATION: /label= leader (xi) SEQUENCE DESCRIPTION: SEQ ID NO:32: Met Ala Cys Leu Gly Phe Gin Arg His Lys Ala Gin Leu Asn Leu Ala 1 5 10 15 Thr Arg Thr Trp Pro Cys Thr Leu Leu Phe Phe Leu Leu Phe He Pro 20 25 30 Val Phe Cys Lys Ala 35 (2) INFORMATION FOR SEQ ID NO:33: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 24 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..24 (D) OTHER INFORMATION: /label= leader (xi) SEQUENCE DESCRIPTION: SEQ ID NO:33: Met Pro Met Gly Ser Leu Gin Pro Leu Ala Thr Leu Tyr Leu Leu Gly 1 5 10 15 Met Leu Val Ala Ser Cys Leu Gly 20 (2) INFORMATION FOR SEQ ID NO:34: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 25 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear ( ii ) MOLECULE TYPE : peptide (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..25 (D) OTHER INFORMATION: /label= leader (xi) SEQUENCE DESCRIPTION: SEQ ID NO:34: Met Ala Gly Pro Pro Arg Leu Leu Leu Leu Pro Leu Leu Leu Ala Leu 1 5 10 15 Ala Arg Gly Leu Pro Gly Ala Leu Ala 20 25 (2) INFORMATION FOR SEQ ID NO:35: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 26 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..26 (D) OTHER INFORMATION: /label= leader (xi) SEQUENCE DESCRIPTION: SEQ ID NO:35: Met Lys Asp Ser Cys He Thr Val Met Ala Met Ala Leu Leu Ser Gly 1 5 10 15 Phe Phe Phe Phe Phe Ala Pro Ala Ser Ser 20 25 (2) INFORMATION FOR SEQ ID NO:36: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 22 amino acidβ (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..22 (D) OTHER INFORMATION: /label= leader (xi) SEQUENCE DESCRIPTION: SEQ ID NO:36: Met Leu Gly Leu Arg Pro Pro Leu Leu Ala Leu Val Gly Leu Leu Ser 1 5 10 15 Leu Gly Cye Val Leu Ser 20 (2) INFORMATION FOR SEQ ID NO:37: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 amino acidβ (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..20 (D) OTHER INFORMATION: /label= leader (xi) SEQUENCE DESCRIPTION: SEQ ID NO:37: Met Ala Arg Pro Hie Pro Trp Trp Leu Cyβ Val Leu Gly Thr Leu Val 1 5 10 15 Gly Leu Ser Ala 20 (2) INFORMATION FOR SEQ ID NO:38: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 15 amino acidβ (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..15 (D) OTHER INFORMATION: /label= leader (xi) SEQUENCE DESCRIPTION: SEQ ID NO:38: Met Ala Thr Leu Leu Leu Leu Leu Gly Val Leu Val Val Ser Pro 1 5 10 15 (2) INFORMATION FOR SEQ ID NO:39: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 23 amino acidβ (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..23 (D) OTHER INFORMATION: /label= leader (xi) SEQUENCE DESCRIPTION: SEQ ID NO:39: Met Tyr Leu Trp Leu Lys Leu Leu Ala Phe Gly Phe Ala Phe Leu Asp 1 5 10 15 Thr Glu Val Phe Val Thr Gly 20 (2) INFORMATION FOR SEQ ID NO:40: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 26 amino acidβ (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..26 (D) OTHER INFORMATION: /label= leader (xi) SEQUENCE DESCRIPTION: SEQ ID NO:40: Met Trp Ser Arg Gly Trp Asp Ser Cys Leu Ala Leu Glu Leu Leu Leu 1 5 10 15 Leu Pro Leu Ser Leu Leu Val Thr Ser He 20 25 (2) INFORMATION FOR SEQ ID NO:41: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 34 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: peptide (ix) FEATURE: (A) NAME/KEY: Peptide (B) LOCATION: 1..34 (D) OTHER INFORMATION: /label= leader (xi) SEQUENCE DESCRIPTION: SEQ ID NO:41: Met Gly His Thr Arg Arg Gin Gly Thr Ser Pro Ser Lys Cys Pro Tyr 1 5 10 15 Leu Asn Phe Phe Gin Leu Leu Val Leu Ala Gly Leu Ser His Phe Cyβ 20 25 30 Ser Gly While various embodiments of the present invention have been described in detail, it is apparent that modifications and adaptations of those embodiments will occur to those skilled in the art. It is to be expressly understood, however, that such modifications and adaptations are within the scope of the present invention, as set forth in the following claims:

Claims: What is claimed is: 1. A T lymphocyte veto molecule comprising a chimeric molecule having a protein selected from the group consisting of CD4 protein, CD2 protein, CD28 protein, CTLA4 protein, Fas-ligand protein, CD5 protein, CD7 protein, CD9 protein, CDll protein, CD18 protein, CD27 protein, CD43 protein, CD45 protein, CD48 protein, B7.1 protein and B7.2 protein, wherein said protein is linked to a targeting polypeptide that binds to a molecule that differentiates a host cell from a tissue graft cell. 2. The veto molecule of Claim 1, wherein said chimeric molecule is derived from an animal selected from the group consisting of a human, a non-human primate, a pig, a mouse, a rat, a rabbit, a horse, a goat and a hamster. 3. The veto molecule of Claim 1, wherein said chimeric molecule is derived from an animal selected from the group consisting of a human, a baboon and a pig. 4. The veto molecule of Claim 1, wherein said protein is a CD4 protein that comprises at least one V and at least one C2 domain of a CD4 protein. 5. The veto molecule of Claim 1, wherein said protein comprises an amino acid substitution comprising a residue selected from the group consisting of proline and cysteine. 6. The veto molecule of Claim 1, wherein said protein is a CD4 protein that comprises the amino acid sequence extending from about residue 1 to about residue 203 of a CD4 protein, in which the initiating Met is residue 1. 7. The veto molecule of Claim 1, wherein said protein is a CD2 protein that comprises the extracellular domains of a CD2 protein. 8. The veto molecule of Claim 1, wherein said protein is a CD2 protein that comprises the amino acid sequence extending from about residue 1 to about residue 208 of a CD2 protein, in which the initiating Met is residue 1. 9. The veto molecule of Claim 1, wherein said protein is a CD28 protein that comprises a homodimer of the pseudo-V-region of a CD28 protein. 10. The veto molecule of Claim 1, wherein said protein is a CD28 protein that comprises the amino acid sequence extending from about residue 1 to about residuelβl of a CD28 protein, in which the initiating Met is residue 1. ll. The veto molecule of Claim 1, wherein said protein is a CTLA4 protein that comprises a homodimer of the pseudo-V-region of a CTL4A protein. 12. The veto molecule of Claim 1, wherein said protein is a CTLA4 protein that comprises the amino acid sequence extending from about residue 1 to about residue 161 of a CTL4A protein, in which the initiating Met is residue 1. 13. The veto molecule of Claim 1, wherein said protein is a Fas-ligand protein that comprises the extracellular domain of a Fas-ligand protein. 14. The veto molecule of Claim 1, wherein said protein is a Fas-ligand protein that comprises the amino acid sequence extending from about residue 137 to about residue 283 of a Fas-ligand protein, in which the initiating Met is residue 1. 15. The veto molecule of Claim 1, wherein said protein is a CD5 protein that comprises domains l through 3 of a CD5 protein. 16. The veto molecule of Claim 1, wherein said protein is a CD5 protein that comprises the amino acid sequence extending from about residue 1 to about residue 372 of a CD5 protein, in which the initiating Met is residue 1. 17. The veto molecule of Claim 1, wherein said protein is a CD7 protein that comprises the psuedo-V-region of a CD7 protein. 18. The veto molecule of Claim 1, wherein said protein is a CD7 protein that comprises the amino acid sequence extending from about residue 1 to about residue 180 of a CD7 protein, in which the initiating Met is residue 1. 19. The veto molecule of Claim 1, wherein said protein is a CD9 protein that comprises the extracellular domain of a CD9 protein. 20. The veto molecule of Claim 1, wherein said protein is a CD9 protein that comprises the amino acid sequence extending from about residue 113 to about residue 192 of a CD9 protein, in which the initiating Met is residue 1. 21. The veto molecule of Claim 1, wherein said protein is a CDll protein that comprises the CDll alpha domain of a CDll protein complexed with the CD18 extracellular domain. 22. The veto molecule of Claim 1, wherein said protein is a CDll protein that comprises the amino acid sequence extending from about residue 1 to about residue 1089 of a CDll alpha protein, in which the initiating Met is residue 1. 23. The veto molecule of Claim 1, wherein said protein is a CD18 protein that comprises the extracellular domain of a CD18 protein. 24. The veto molecule of Claim 1, wherein said protein is a CD18 protein that comprises the amino acid sequence extending from about residue 1 to about residue 750 of a CD18 protein, in which the initiating Met is residue 1. 25. The veto molecule of Claim 1, wherein said protein is a CD27 protein that comprises the extracellular domain of a CD27 protein. 26. The veto molecule of Claim 1, wherein said protein is a CD27 protein that comprises the amino acid sequence extending from about residue 1 to about residue 191 of a zCD27 protein, in which the initiating Met is residue 1. 27. The veto molecule of Claim 1, wherein said protein is a CD43 protein that comprises the extracellular domain of a CD43 protein. 28. The veto molecule of Claim l, wherein said protein is a CD43 protein that comprises the amino acid sequence extending from about residue 1 to about residue 384 of a CD43 protein, in which the initiating Met is residue 1. 29. The veto molecule of Claim 1, wherein said protein is a CD45 protein that comprises an extracellular domain of an isoform of a CD45 protein. 30. The veto molecule of Claim 1, wherein said protein is a CD45 protein that comprises the amino acid sequence extending from about residue 1 to about residue 556 of a CD45 protein, in which the initiating Met is residue 1. 31. The veto molecule of Claim 1, wherein said protein is a CD48 protein that comprises a pseudovariable and a pseudoconstant extracellular domains of a CD48 protein. 32. The veto molecule of Claim l, wherein said protein is a CD48 protein that comprises the amino acid sequence extending from about residue 1 to about residue 220 of a CD48 protein, in which the initiating Met is residue 1. 33. The veto molecule of Claim 1, wherein said protein is a B7.1 protein that comprises a pseudovariable and a pseudoconstant extracellular domains of a B7.1 protein. 34. The veto molecule of Claim 1, wherein said protein is a B7.1 protein that comprises the amino acid sequence extending from about residue 1 to about residue 242 of a B7.1 protein, in which the initiating Met is residue 1. 35. The veto molecule of Claim l, wherein said protein is a B7.2 protein that comprises an extracellular domain of a B7.2 protein. 36. The veto molecule of Claim 1, wherein said protein is a B7.2 protein that comprises the amino acid sequence extending from about residue 1 to about residue 74 of a B7.2 protein, in which the initiating Met is residue 1. 37. The veto molecule of Claim 1, wherein said protein comprises an amino acid sequence selected from the group consisting of: SEQ ID N0:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID N0:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID N0:9, SEQ ID NO:10, SEQ ID NO:ll, SEQ ID NO:12, SEQ ID NO:13, SEQ ID NO:14, SEQ ID NO:15 and SEQ ID NO:16. 38. The veto molecule of Claim l, wherein said protein is linked by a peptide bond to the constant region domain of an immunoglobulin molecule, to form a protein:Ig conjugated molecule. 39. The veto molecule of Claim 38, wherein said immunoglobulin molecule of said protein:Ig conjugated molecule comprises a constant region domain of an IgG2a molecule. 40. The veto molecule of Claim 38, wherein said protein:Ig conjugated molecule comprises an amino acid sequence comprising a sequence selected from the group consisting of SEQ ID NO:17, SEQ ID NO:18, SEQ ID NO:19, SEQ ID NO:20 and SEQ ID NO:21. 41. The veto molecule of Claim 1, wherein said targeting polypeptide comprises an immunoglobulin molecule. 42. The veto molecule of Claim 1, wherein said targeting polypeptide comprises an immunoglobulin that binds to a major histocompatibility molecule. 43. The veto molecule of Claim 1, wherein said targeting polypeptide comprises an immunoglobulin molecule selected from the group consisting of WFL4F12.3, WFL3C6.1, BB7.2, PA2.1, 2.28M1, MA2.1, GAP A3, A11.1M, 4D12, BB7.1, B27M1, ME1, BB7.6, MB40.2, MB40.2, B27M2, SFR8-B6, Genox 3.53, G2a.5 and SF 3-DR5. 44. The veto molecule of Claim 1, wherein said protein is linked to said targeting polypeptide by a chemically produced di-sulfide bond. 45. The veto molecule of Claim 1, wherein said chimeric molecule can be secreted from a cell that produces said molecule. 46. A recombinant cell having: (1) a first recombinant molecule comprising a first nucleic acid molecule operatively linked to an expression vector, said first nucleic acid molecule having a sequence encoding a first protein selected from the group consisting of CD4, CD2, CD28, CTL4A, Fas-ligand, CD5, CD7, CD9, CDll, CD18, CD27, CD43, CD45, CD48, B7.1 and B7.2; and (2) a second recombinant molecule comprising a second nucleic acid molecule operatively linked to an expression vector, said second nucleic acid molecule having a sequence encoding a second protein comprising a targeting molecule selected from the group consisting of a targeting molecule that differentiates a host cell from a tissue graft cell and a targeting molecule that selectively targets a stimulator cell involved in an autoimmune response. 47. The recombinant cell of Claim 46, wherein said first and second proteins are bound to the plasma membrane of said recombinant cell. 48. The recombinant cell of Claim 46, wherein said recombinant cell is not capable of stimulating a T cell response. 49. The recombinant cell of Claim 46, wherein said recombinant cell is derived from a host cell selected from the group consisting of a fibroblast, a pluripotent progenitor cell, an epithelial cell, a neural cell, a T cell line and a B cell line. 50. The recombinant cell of Claim 46, wherein said first nucleic acid molecule comprises a nucleic acid sequence that encodes an amino acid sequence selected from the group consisting of SEQ ID NO:l, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, SEQ ID NO:11, SEQ ID NO:12, SEQ ID NO:13, SEQ ID NO:14, SEQ ID NO:15 and SEQ ID NO:16. 51. The recombinant cell of Claim 46, wherein second nucleic acid molecule encodes an amino acid sequence derived from a protein selected from the group consisting of an immunoglobulin molecule, a growth factor and a tissue specific antigen. 52. A composition comprising: a T lymphocyte veto molecule comprising a chimeric molecule having a targeting molecule selected from the group consisting of a targeting molecule that differentiates a host cell from a tissue graft cell and a targeting molecule that selectively targets a stimulator cell involved in an autoimmune response, wherein said targeting molecule is linked to a protein selected from the group consisting of a CD4 protein, a CD2 protein, a CD28 protein, a CTL4A protein, a Fas-ligand protein, a CD5 protein, a CD7 protein, a CD9 protein, a CDll protein, a CD18 protein, a CD27 protein, a CD43 protein, a CD45 protein, a CD48 protein, a B7.1 protein and a B7.2 protein and mixtures thereof; and a pharmaceutically acceptable carrier. 53. A method for producing a T lymphocyte veto molecule, comprising: (a) providing a first protein comprising a compound selected from the group consisting of a CD4, CD2, CD28, CTL4A, Fas-ligand, CD5, CD7, CD9, CDll, CD18, CD27, CD43, CD45, CD48, B7.1 and B7.2 protein; (b) providing a second protein comprising a targeting molecule selected from the group consisting of a targeting molecule that differentiates a host cell from a tissue graft cell and a targeting molecule that selectively targets a stimulator cell involved in an autoimmune response; and (c) linking said first protein to said second protein to form a chimeric molecule. 54. The method of Claim 53, wherein said first protein is produced by culturing a cell transformed with a recombinant molecule comprising a nucleic acid molecule operatively linked to an expression vector, said nucleic acid molecule comprising a nucleic acid sequence that encodes an amino acid sequence selected from the group consisting of SEQ ID NO:l, SEQ ID NO:2, SEQ ID NO:3, SEQ ID N0:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID N0:7, SEQ ID N0:8, SEQ ID NO:9, SEQ ID NO:10, SEQ ID NO:ll, SEQ ID NO:12, SEQ ID NO:13, SEQ ID NO: 14, SEQ ID NO:15, SEQ ID NO: 16 and mixtures thereof. 55. The method of Claim 53, wherein said second protein is produced by culturing a cell transformed with a recombinant molecule comprising a nucleic acid molecule operatively linked to an expression vector, said nucleic acid molecule comprising a nucleic acid sequence encoding an amino acid sequence derived from a protein selected from the group consisting of an immunoglobulin molecule, a growth factor and a tissue specific antigen. 56. The method of Claim 53, wherein said step of linking comprises combining said first and second proteins and contacting said proteins with a reagent capable of creating di-sulfide bonds between said first and second proteins. 57. The method of Claim 53, wherein said step of linking is performed using N-succinimidyl-3-l-(l- pyridyldthio)-propionate. 58. The method of Claim 53, wherein said chimeric molecule is recovered from said first and second proteins that have not been linked. 59. The method of Claim 53, wherein said chimeric molecule is recovered from said first and second proteins that have not been linked by a method selected from the group consisting of size separation chromatography, affinity chromatography, ion-exchange chromatography, reverse phase chromatography, chromatofocussing, hydroxyapatite adsorption and electrophoresis systems. 60. A method to suppress an immune response comprising: (a) providing a chimeric molecule having a protein selected from the group consisting of CD4 protein, CD2 protein, CD28 protein, CTL4A protein, Fas-ligand protein, CD5 protein, CD7 protein, CD9 protein, CDll protein, CD18 protein, CD27 protein, CD43 protein, CD45 protein, CD48 protein, B7.1 protein and B7.2 protein, wherein said protein is linked to a stimulator cell- targeting molecule; and (b) exposing said chimeric molecule to a stimulator cell that can interact specifically with said chimeric molecule, for a time and under conditions sufficient to enable said stimulator cell to reduce an immune response of a responder cell. 61. The method of Claim 60, wherein said chimeric molecule is contacted with said stimulator cell in vivo. 62. The method of Claim 60, wherein said responder cell is a T cell. 63. The method of Claim 60, wherein said responder cell is a CD4+ T lymphocyte. 64. The method of Claim 60, wherein said immune response is directed against a tissue-graft antigen or a processed antigen. 65. The method of Claim 60, wherein said exposure time is from between about 1 hour to about 4 days. 66. (a) A method to alleviate tissue transplant rejection, comprising administering to an animal an effective amount of a therapeutic composition comprising a T lymphocyte veto molecule comprising a chimeric molecule having a targeting molecule that differentiates a host cell from a tissue graft cell, wherein said targeting molecule is linked to a protein selected from the group consisting of a CD4 protein, a CD2 protein, a CD28 protein, a CTL4A protein, a Fas-ligand protein, a CD5 protein, a CD7 protein, a CD9 protein, a CDll protein, a CD18 protein, a CD27 protein, a CD43 protein, a CD45 protein, a CD48 protein, a B7.1 protein and a B7.2 protein and mixtures thereof. 67. The method of Claim 66, wherein said targeting molecule that differentiates a host cell from a tissue graft cell comprises an immunoglobulin that specifically binds to an epitope on a major histocompatibility complex molecule. 68. The method of Claim 66, wherein said chimeric molecule is administered to said animal prior to and after said animal receives a tissue transplant. 69. The method of Claim 66, wherein said chimeric molecule is administered to said animal in two injections about one week prior to transplantation. 70. The method of Claim 66, wherein said chimeric molecule is administered to said animal about 2 weeks to about 3 weeks after said animal receives a tissue transplant. 71. The method of Claim 66, wherein said therapeutic composition is sterile and further comprises a pharmaceutically acceptable carrier. 72. The method of Claim 66, wherein said therapeutic composition is administered by a method selected from the group consisting of oral, nasal, topical, inhaled, transdermal, rectal, intraarticular, intracranial, intraperitoneal and intravenous routes. 73. The method of Claim 66, wherein said animal is selected from the group consisting of humans, dogs, cats, cows and horses. 74. A T lymphocyte veto molecule comprising a chimeric molecule having a protein selected from the group consisting of CD4 protein, CD2 protein, CD28 protein, CTLA4 protein, Fas-ligand protein, CD5 protein, CD7 protein, CD9 protein, CDll protein, CD18 protein, CD27 protein, CD43 protein, CD45 protein, CD48 protein, B7.1 protein and B7.2 protein, wherein said protein is linked to a targeting polypeptide that binds to a molecule which selectively targets a stimulator cell involved in an autoimmune response. 75. The veto molecule of Claim 74, wherein said chimeric molecule is derived from an animal selected from the group consisting of a human, a non-human primate, a pig, a mouse, a rat, a rabbit, a horse, a goat and a hamster. 76. The veto molecule of Claim 74, wherein said protein comprises an amino acid sequence selected from the group consisting of: SEQ ID N0:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, SEQ ID NO: 11, SEQ ID NO:12, SEQ ID NO:13, SEQ ID NO:14, SEQ ID NO:15 and SEQ ID NO:16. 77. The veto molecule of Claim 74, wherein said protein is linked by a peptide bond to the constant region domain of an immunoglobulin molecule, to form a protein:Ig conjugated molecule. 78. The veto molecule of Claim 77, wherein said immunoglobulin molecule of said protein:Ig conjugated molecule comprises a constant region domain of an IgG2a molecule. 79. The veto molecule of Claim 77, wherein said protein:Ig conjugated molecule comprises an amino acid sequence comprising a sequence selected from the group consisting Of SEQ ID NO:17, SEQ ID NO:18, SEQ ID NO:19, SEQ ID NO:20 and SEQ ID NO:21. 80. The veto molecule of Claim 74, wherein said targeting polypeptide is selected from the group consisting of an immunoglobulin molecule, a growth factor and a tissue specific antigen. 81. The veto molecule of Claim 74, wherein said targeting polypeptide comprises an immunoglobulin that binds to a protein selected from the group consisting of a major histocompatibility molecule, asialoglycoprotein receptor, bile acid receptor, LMA surface target molecules, heart cell surface proteins, islets of Langerhans cell surface proteins, c-kit receptor and blood proteins. 82. The veto molecule of Claim 74, wherein said targeting polypeptide comprises an immunoglobulin molecule selected from the group consisting of WFL4F12.3, WFL3C6.1, BB7.2, PA2.1, 2.28M1, MA2.1, GAP A3, A11.1M, 4D12, BB7.1, B27M1, ME1, BB7.6, MB40.2, MB40.2, B27M2, SFR8-B6, Genox 3.53, G2a.5 and SFR3-DR5. 83. The veto molecule of Claim 74, wherein said targeting polypeptide comprises a growth factor selected from the group consisting of thyroid stimulating hormone, vasopressin, or corticotropin. 84. The veto molecule of Claim 74, wherein said targeting polypeptide comprises a tissue specific marker selected from the group consisting of asialoglycoprotein receptor, thyroid stimulating hormone receptor, vasopressin receptor or corticotropin receptor. 85. The veto molecule of Claim 74, wherein said protein is linked to said targeting polypeptide by a chemically produced di-sulfide bond. 86. The veto molecule of Claim 74, wherein said chimeric molecule can be secreted from a cell that produces said molecule. 87. A method to treat an autoimmune disease, comprising administering to an animal an effective amount of a therapeutic composition comprising a chimeric molecule having a targeting molecule which selectively targets a stimulator cell involved in an autoimmune response, wherein said targeting molecule is linked to a protein selected from the group consisting of a CD4 protein, a CD2 protein, a CD28 protein, a CTL4A protein, a Fas-ligand protein, a CD5 protein, a CD7 protein, a CD9 protein, a CDll protein, a CD18 protein, a CD27 protein, a CD43 protein, a CD45 protein, a CD48 protein, a B7.1 protein and a B7.2 protein, and mixtures thereof. 88. The method of Claim 87, wherein said autoimmune disease selected from the group consisting of systemic lupus erythematosus, myasthenia gravis, rheumatoid arthritis, insulin-dependent diabetes mellitus, multiple sclerosis, celiac disease, autoimmune thyroiditis, Addison's disease, Graves' disease and rheumatic carditis. 89. The method of Claim 87, wherein said therapeutic composition is sterile and further comprises a pharmaceutically acceptable carrier. 90. The method of Claim 87, wherein said therapeutic composition is administered by a method selected from the group consisting of oral, nasal, topical, inhaled, transdermal, rectal, intraarticular, intracranial, intraperitoneal and intravenous routes. Ill

Inventors: STAERZ UWE D, STAERZ, UWE, D.
Applicants: NAT JEWISH CT IMMUN & RESPIRAT, STAERZ UWE D, NATIONAL JEWISH CENTER FOR IMMUNOLOGY AND RESPIRAT, STAERZ, UWE, D.
Application year: 1997
Main classification: A61K39
IPC codes: A61P37, C07K14, C07K16, C12N15, C12P21