DOMAINS OF EXTRACELLULAR REGION OF HUMAN PLATELET DERIVED GROWTH FACTOR RECEPTOR POLYPEPTIDES

Abstract: Defined constructs of modified human platelet-derived growth factor receptor polypeptides are provided. Extracellular region domain structures are identified and modifications and combinatorial rearrangements of the receptor segments are provided. Both cell bound and soluble forms of modified segments are made available, as are methods for assays using them, allowing for screening or ligand analogues.

Description: DOMAINS OF EXTRACELLULAR REGION OF HUMAN PLATELET DERIVED GROWTH FACTOR RECEPTOR POLYPEPTIDES FIELD OF THE INVENTION The present invention relates to receptors for growth factors, particularly to human platelet-derived growth factor receptors (hPDGF-R) . More particularly, it provides various composite constructs of human platelet-derived growth factor receptors, these constructs retaining ligand binding regions found in the natural extracellular region of the receptors. It also provides recombinant nucleic acids encoding these polypeptides, typically also comprising a promoter for expression, and fusion peptides on the amino or carboxy terminus of the expressed extracellular composite structure. Antibodies are provided which recognize epitopes containing amino acids contained in different domains of the extracellular region. Cells comprising these polypeptides and nucleic acids, and diagnostic uses of these reagents are also provided. BACKGROUND OF THE INVENTION Polypeptide growth factors are mitogens that act on cells by specifically binding to receptors located on the cell plasma membrane. The platelet-derived growth factor (PDGF) stimulates a diverse group of biochemical responses, e.g., changes in ion fluxes, activation of various kinases, alteration of cell shape, transcription of various genes, and modulation of enzymatic activities associated with phospholipid metabolism. See, e.g.. Bell et al. (1989) "Effects of Platelet Factors on Migration of Cultured Bovine Aortic Endothelial and Smooth Muscle Cells," Circulation Research 65:1057-1065. Platelet-derived growth factors are found in higher animals, particularly in warm blooded animals, e.g., mammals. In vitro, PDGF is a major polypeptide mitogen in serum for cells of mesenchymal origin such as fibroblasts, smooth muscle cells, and glial cells. In vivo, PDGF does not normally circulate freely in blood, but is stored in the alpha granules of circulating blood platelets. During blood clotting and platelet adhesion the granules are released, often at sites of injured blood vessels, thereby implicating PDGF in the repair of blood vessels. PDGF may stimulate migration of arterial smooth muscle cells from the medial to the intimal layer of the artery where the muscle cells may proliferate. This is likely to be an early response to injury. PDGF has also been implicated in wound healing, in atherosclerosis, in myeloproliferative disease, and in stimulating genes associated with cancerous transformation of cells, particularly c-myc and c-fos. The platelet-derived growth factor is composed of two homologous polypeptide chains; it is a dimer of 16 kilodalton proteins which are disulfide connected. These polypeptides are of two types, the type B chain and the type A chain. Three forms of the growth factor dimer are found corresponding to a homodi er of two type A chains, a homodimer of two type B chains, and a heterodi er of the type A chain with the type B chain. Each of these three different combinations is referred to as a PDGF isoform. See, for a review on PDGF, Ross et al. (1986) "The Biology of Platelet-Derived Growth Factor," Cell 46:155-169. The growth factor sequences from mouse and human are highly homologous. The PDGF acts by binding to the platelet-derived growth factor receptor (PDGF-R) . The receptor is typically found on cells of mesenchymal origin. The functional receptor acts while in a form comprising of two transmembrane glycoproteins, each of which is about 180 kilodaltons. Two different polypeptides have been isolated, a type B receptor polypeptide and a type A receptor polypeptide. A sequence of a type B receptor polypeptide of the mouse platelet-derived growth factor receptor polypeptide is published in Yarden et al. (1986) Nature 323:226-232. A sequence of an type A human platelet-derived growth factor receptor (hPDGF-R) polypeptide is disclosed in Matsui et al. (1989) Science 243: 800-803. These PDGF receptors usually have three major identifiable regions. The first is a transmembrane region (TM) which spans the plasma membrane once, separating the regions of the receptor exterior to the cell from the regions interior to the cell. The second region is an extracellular region (XR) which contains the domains that bind the polypeptide growth factor (i.e., the ligand binding domains). The third is an intracellular region (IR) which possesses a tyrosine kinase activity. This tyrosine kinase domain is notable in having an insert of about 100 amino acids, as compared with most other receptor tyrosine kinase domains which are contiguous or have shorter insert segments. The complete sequences of the human type B and human type A receptor polypeptides are reported elsewhere, e.g., U.S.S.N. 07/309,322, which is hereby incorporated herein by reference. However, for many purposes, a smaller or less than full length functional protein would be desired. For example, smaller molecules may be more easily targeted to areas of compromised circulation, or present fewer epitopes or extraneous domains unrelated to various activities of interest. Functional analogues with a slightly modified spectrum of activity, or different specificity would be very useful. Thus, the use of new composite constructs exhibiting biological activity in common with platelet-derived growth factor receptor polypeptides will have substantial use as research reagents, diagnostic reagents, and therapeutic reagents. In particular, the identification of important polypeptide features in the extracellular region of the platelet-derived growth factor receptor polypeptides will allow substitutions and deletions of particular features of the domains. Moreover, use of an in vitro assay system provides the ability to test cytotoxic or membrane disruptive compounds. SUMMARY OF THE INVENTION In accordance with the present invention, defined constructs of modified human platelet-derived growth factor receptor polypeptides are provided. Extracellular region domain structures are identified and modifications and combinatorial rearrangements of the receptor segments are furnished. Both cell bound and soluble forms of modified segments are made available, as are methods for assays using them, thereby allowing for screening of ligand analogues. The present invention provides a platelet-derived growth factor receptor (hPDGF-R) fragment of between about 8 and 400 amino acids comprising one or more platelet-derived growth factor (PDGF) ligand binding regions (LBR's) from extracellular domains Dl, D2, or D3, wherein the fragment binds a platelet-derived growth factor ligand. Generally, the fragment will exhibit a binding affinity of about 5 nM or better and will have a sequence of at least about 6 or 8 contiguous amino acids, preferably at least about 15 or more contiguous amino acids from a domain D3 intra-cysteine region. The fragment will often lack a transmembrane region. In other embodiments, the fragment is soluble, is substantially pure, or has at least one ligand binding region derived from a domain D3. The fragment may be derived from a type B, or from a type A PDGF-R LBR fragment, e.g., from Table 1 or Table 2. In particular embodiments, the fragment is selected from the group of formulae consisting of: a) Xa-Dm-Xc; b) Xa-Dm-Xl-Dn-Xc; c) Xa-Dm-Xl-Dn-X2-Dp-Xc; and d) Xa-Dm-Xl-Dn-X2-Dp-X3-Dq-Xc; e) Xa-Dm-Xl-Dn-X2-Dp-X3-Dq-X4-Dr-Xc; where the fragment is not D1-D2-D3-D4-D5; each of Xa, XI, X2, X3, and Xc is, if present, a polypeptide segment lacking a D domain; and each of Dm, Dn, Dp, and Dq is, independently of one another, selected from the group consisting of Dl, D2, D3, D4, and D5. Preferred fragments are selected from the group consisting of: a) D1-D2-D3 or D3-D4-D5 ; and b) D1-D2-D3-D4 or D2-D3-D4-D5 . The present invention also embraces a soluble human platelet-derived growth factor receptor (hPDGF-R) fragment of between about 10 and 350 amino acids comprising at least one platelet-derived growth factor (PDGF) ligand binding region (LBR) from a domain D3, wherein the fragment specifically binds to a platelet-derived growth factor ligand. Usually the fragment comprises a sequence of at least about 15 contiguous amino acids from the intra-cysteine portion of domain D3 and has a binding affinity of better than about 5 nM. Other useful fragment embodiments will be soluble, substantially pure, or a type B or type A PDGF-R LBR, e.g., from Table 1 or Table 2. The invention also includes nucleic acid sequences, including those encoding the above described polypeptide fragments. Often the nucleic acid sequences incorporate a promoter, generally operably linked to the sequence encoding the fragments. Cells comprising the nucleic acids or peptides of the invention are also embraced. In particular cell embodiments, the cell will be a mammalian cell, and often will contain both a nucleic acid and a protein expression product of the nucleic acid. The compositions described above provide antibodies which recognize an epitope of a described PDGF-R fragment, but not a natural PDGF-R epitope. The antibody will often be a monoclonal antibody. The present invention also provides a method for measuring the PDGF receptor binding activity of a biological sample comprising the steps of: a) contacting an aliquot of a sample to a PDGF ligand in the presence of a described PDGF-R fragment in a first analysis; b) contacting an aliquot of the sample to a PDGF ligand in the absence of the PDGF-R fragment in a second analysis; and c) comparing the amount of binding in the two analyses. In some instances, the PDGF-R fragment is attached to a cell, or a solid substrate, e.g., a microtiter dish. The invention also embraces a method for measuring the PDGF ligand content of a biological sample comprising the steps of: a) contacting an aliquot of the sample to a ligand binding region (LBR) in the presence of a described PDGF-R fragment in a first analysis; b) contacting an aliquot of the sample to a LBR in the absence of the PDGF-R fragment in a second analysis; and c) comparing the amount of binding in the two analyses. In some embodiments, the contacting steps are performed simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 illustrates a strategy for oligonucleotide directed in vitro deletion mutagenesis of soluble hPDGF-R extracellular domains. Many of these constructs will be soluble peptides, or can be modified to be such. The abbreviations used are: PR = PDGF-R; intact P = PDGF-R; extracellular region TM = transmembrane K = kinase S = signal sequence Fig. 2 illustrates the structure of a plasmid derived form pcDL-Sα296 used for expressing various deletion polypeptides. Fig. 3 illustrates the structure of a plasmid pBJΔ derived from pcDLα296. See Takabe et al. (1988) Mol. Cell. Biol. 8:466-472. 1. The pcDL-SRα296 is cut with Xhol. 2. A polylinker (XhoI-Xbal-Sfil-Notl-EcoRI- EcoRV-Hindlll-Clal-Sall) is inserted into the Xhol cut vector. 3. Sail is compatible with the Xhol site; and generates both a Sail and an Xhol site. 4. The SV40 16s splice junction is no longer present. Fig. 4 illustrates the inhibition of receptor phosphorylation by a human type B PDGF receptor polypeptide. Labeling with a reagent which binds to phosphorylated tyrosine shows that phosphorylation activity is decreased in the presence of the receptor polypeptide fragment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT I. General Description A. PDGF-R 1. structural features a. extracellular domain (XR) i. signal sequence ii. D domains (Ig-like) b. transmembrane segment (TM) c. intracellular domain (IR) i. tyrosine kinase ii. insert 2. function a. bind ligands (PDGF analogues) b. tyrosine kinase activity c. bind to PDGF-R peptide (dimer formation) d. phosphorylated segments B. Physiological Functions 1. cellular 2. tissue differentiation 3. organismal II. Polypeptides A. D domains 1. /8-sheet strands 2 . cysteine residues B. Soluble Forms, extracellular region C. Truncated/Deletion Forms D. Fusion Proteins E. Genetic Variants (site-directed mutagenized) F. Compositions Comprising Proteins III. Nucleic Acids A. Isolated Nucleic Acids B. Recombinant Nucleic Acids C. Compositions Comprising Nucleic A^ids IV. Methods for Making PDGF-R Constructs A. Protein Purification 1. affinity with derivatized PDGF 2. various ligands, same receptor B. Expression of Nucleic Acids C. Synthetic methods V. Antibodies VI. Methods for Use A. Diagnostic B. Therapeutic * * * I. General Description A. Platelet-derived growth factor receptor (PDGF-R) The human platelet-derived growth factor receptor (hPDGF-R) typically comprises two polypeptides. These polypeptides, which may be identical or only slightly different, associate during the functional activities of ligand binding and transducing of the ligand binding signal into the cell. The platelet-derived growth factor receptor was identified as having a major component of an approximately 180 kilodalton protein which is glycosylated. This glycoprotein was identified as a platelet-derived growth factor receptor polypeptide. Primary structures of two homologous forms of polypeptides have been reported. A type B receptor nucleic acid and its corresponding polypeptide sequence from mouse are reported in Yarden et al. (1986) Nature 323: 226-232; and a homologous genetic sequence has been isolated from humans. See U.S.S.N. 07/309,322. A human type A receptor sequence is reported in Matsui et al. (1989) Science 243: 800-803. Although the two different forms of the receptor polypeptides are homologous, they are encoded by two separate genes. The functional receptor apparently involves a dimer of these polypeptides, either homodimers of the type B receptor polypeptide or of the type A receptor polypeptide, or a heterodimer of the type B receptor polypeptide with an type A receptor polypeptide. The specificity of binding of each of these forms of the receptor is different for each of the different forms of platelet-derived growth factor (PDGF) , the AA, BB, or AB forms (from either mouse or human, or presumably other mammals) . The PDGF-R is a member of a family of related receptors. See, e.g., Yarden et al. supr . Each of these receptor polypeptides has a hydrophobic membrane spanning region (TM for transmembrane) , a large extracellular region (XR) with regularly spaced cystine residues, and a cytoplasmic intracellular region (IR) having intracellular tyrosine kinase activity. The XR of the PDGF-R has a predicted structure containing 5 β-strand-rich immunoglobulin (Ig)-like domains. Each of these Ig-like domains consists of about 100 amino acids, ranging more specifically from about 88 to about 114 amino acids, and, except for the fourth domain, contains regularly spaced cysteine residues. Many of the structural features of the various growth factor receptors are homologous, including the mouse and human versions of the PDGF-R. Thus, many of the structural features defined herein are shared with other related proteins. However, in most cases, the functional relationship to particular structural features is unknown. The intracellular region (IR) is that segment of the PDGF-R which is carboxy proximal of the transmembrane (TM) segment. The intracellular region is characterized, in part, by the presence of a split tyrosine kinase structural domain. In the human type B receptor polypeptide, the tyrosine kinase domain is about 244 amino acids with an insert of about 104 amino acids. See Table 1. In the human type A receptor polypeptide, the domain is about 244 amino acids long with a kinase insert of about 103 amino acids. See Table 2. Functionally, this domain is defined, in part, by its tyrosine kinase activity, typically modulated by ligand binding to binding sites found in the extracellular region, and appears to function in a dimer state. The substrate for phosphorylation includes various tyrosine residues on the accompanying receptor polypeptide chain, and other proteins which associate with the receptor. The tyrosine kinase domain is also defined, in part, by its homology to similar domains in other tyrosine kinase activity containing proteins. See, e.g., Yarden et al. (1986) Nature 323:226-232. Each IR segment of the dimerized receptor complex appears to phosphorylate specific tyrosine residues on the other polypeptide chain. Each transmembrane segment of the human receptor polypeptides is about 24 or 25 amino acids long and is characterized by hydrophobic amino acid residues. These segments have sequences characteristic of membrane spanning segments. In the human type B receptor polypeptide the transmembrane region appears about 25 amino acids long extending from about val(500) to trp(524), while in the human type A receptor polypeptide, the transmembrane segment appears to be about 24 amino acids extending from about leu(502) to trp(526). See, e.g., Claesson-Welsh et al. (1989) Proc. Nat 1 I Acad. Sci. USA. 86:4917-4921. A polypeptide or nucleic acid is a "human" sequence if it is derived from, or originated in part from, a natural human source. For example, proteins derived from human cells, or originally encoded by a human genetic sequence, will be human proteins. A sequence is also human if it is selected on the basis of its high similarity to a sequence found in a natural human sample, or is derived therefrom. A fusion polypeptide or nucleic acid is a molecule which results from the fusion of segments from sequences which are not naturally in continuity with one another. Thus, a chimeric protein or nucleic acid is a fusion molecule. A heterologous protein is a protein originating from a different source. B. Physiological Functions The PDGF-R appears to have at least four major different biological functions. The first is the binding of ligands, usually the PDGF mitogenic proteins or their analogues. These ligands and analogues may also serve as either agonists or antagonists. The ligand binding sites, made up of ligand binding regions (LBR's), are localized in the extracellular region (XR) . The functional receptor transduces a signal in response to ligand binding, and the resulting response is a ligand modulated activity. As the likely ligand is a PDGF, or an analogue, the signal will ordinarily be PDGF modulated. A second biological activity relates to the tyrosine kinase enzymatic activity. This activity is typically activated intracellularly in response to ligand binding. However, since these receptors apparently function in a dimeric state, the interchain binding interactions may be considered a third biological activity which'may be mediated by blocking agents. Blocking or interference with the dimerization interactions may be mediated by receptor protein fragments, particularly in the functional ligand binding or tyrosine kinase activities. Thus, the introduction of analogues of the receptor domains to natural or other receptor polypeptides may serve as an additional means to affect PDGF mediation of ligand mediated activities. The fourth function of the PDGF receptor is as a binding substrate for other proteins, e.g., the PI3 kinase. In particular, the PDGF receptor is phosphorylated at various positions in response to ligand binding or other events. This binding interaction activates an enzymatic activity on the part of the binding protein which activates further cellular or metabolic responses. The term "ligand" refers to the molecules, usually members of the platelet-derived growth factor family, that are bound by the ligand binding regions (LBR's). The binding regions are typically found in the XR. Also, a ligand is a molecule that serves either as the natural ligand to which the receptor binds, or a functional analogue of a ligand. The analogue may serve as an agonist or antagonist. Typically ligands will be molecules which share structural features of natural PDGF, e.g., polypeptides having similar amino acid sequences or other molecules sharing molecular features with a ligand. The determination of whether a molecule serves as a ligand depends upon the measurement of a parameter or response which changes upon binding of that ligand, such as dimerization or tyrosine kinase activity. See, e.g., Gilman et al. (eds) (1990) Goodman and Gilman 1 s: The Pharmacological Bases of Therapeutics. 8th Ed., Pergamon Press, which is incorporated herein by reference. The receptor has ligand binding regions (LBR) , or regions which are important in determining both affinity and specificity of binding of ligand, e.g. , PDGF and its analogues. The ligand binding regions determine the binding interactions between the receptors and ligand. Typically, these regions are those contact points between the ligand molecule and the receptor. These molecular interactions can be determined by crystallographic techniques, or by testing which regions of the receptor are important in ligand interaction. Various segments of the extracellular region of the PDGF receptor make up the ligand binding regions, while other segments form structural segments which spatially orient the LBR's in proper arrangement to properly bind the ligands. Generally, the fragment will have a sequence of at least about 6 contiguous amino acids, usually at least about 8 contiguous amino acids, more usually at least about 10 contiguous amino acids, preferably at least about 13 contiguous amino acids, and more preferably at least about 15 or more contiguous amino acids. Usually, the LBR's will be located within the intra-cysteine (or equivalent) residues of each Ig- like domain, e.g., domains Dl, D2, D3, D4, and D5. They will be preferably derived from D3 sequences, but Dl and D2 derived sequences will also be common. Occasionally, sequences from D4, D5, or other proteins will provide LBR function. The extra-cysteine (or equivalent) regions provide structural functions, as will inter-domain spacer segments. The intra-cysteine portions, or segments, are indicated in Tables 4 and 5, and comprise the segments designated C, C, C", D, and E, along with portions of the B and F segments, as indicated. The extra-cysteine residues comprise the segments designated A and G, and portions of B and F. The ligand binding regions as defined, in part, by the importance of their presence, or their effect on the affinity of PDGF ligand binding. The natural, native full length PDGF-R binds with a Kα of about 0.2 mM. See, e.g., Duan et al. (1991) J. Biol. Chem. 266:413-418, which is hereby incorporated herein by reference. An LBR is a segment of polypeptide whose presence significantly affects ligand binding, generally by at least about a factor of two, usually by at least about a factor of four, more usually by at least a factor of about eight, and preferably by at least about a factor of twelve or more. A fragment of this invention which binds to the PDGF ligand will generally bind with a K d of less than about 10 μM, more generally less than about 1 μM, usually less than about 0.1 μM, more usually less than about 10 nM, preferably less than about 1 nM, and more preferably less than about 0.5 nM. An epitope is an antigenic determinant which potentially or actually has elicited an antibody response. It may also refer to a structural feature which is defined by an antibody binding region, or its equivalent. An epitope need not necessarily be immunogenic, but will serve as a binding site for an antibody molecule or its equivalent. II. Polypeptides Table 1 discloses the sequence of one allele of a type B human platelet-derived growth factor receptor polypeptide. Both a nucleic acid sequence and its corresponding protein sequence are provided. The nucleic acid sequence corresponds to Seq. ID No. 1. The amino acid sequence corresponds to Seq. ID No. 2. A homologous mouse sequence was reported in Yarden et al. (1988) Nature 323:226-232. The sequence of a mouse PDGF receptor polypeptide also exhibits structural features in common with the regions, the domains, and the 0-strand segments of the human receptor polypeptides. The mouse polypeptides, and those from other related receptors, will serve as a source of similar domains, homologous j3-strand segments, and inter-segment sequences, and sequences of homology for general replacement or substitutions. 3S___I___1 Sequence of one type B human PDGF receptor polypeptide allele and protein TGTTCΓCCTGAGCCΓΓΛGGAGCCTGCACCΛGTCCTGCCTGTCCTTCTACTC 52 AGCTGTTACCCACTCTGGGACC_AGCAGTΣRRACTGATAACTGGGAGAGGGCAGTAAGGAGGACRTCC 119 TGGAGGGGGTGACTGTCCIΛGAGCCTGGAACTGTGCCCACACCAGAAGCCATCAGCAGCAAGGACACC 186 ATG CGG CTT CCG GGT GCG ATG CCA GCT CTG GCC CTC AAA GGC GAG CTG CTG 237 Met Arg Leu Pro Gly Ala Met Pro Ala Leu Ala Leu Lys Gly Glu Leu Leu -15 TTG CTG TCT CTC CTG TTA CTT CTG GAA CCA CAG ATC TCT CAG GGC CTG GTC 288 Leu Leu Ser Leu Leu Leu Leu Leu Glu Pro Gin He Ser Gin Gly Leu Val 2 GTC ACA CCC CCG GGG CCA GAG CTT GTC CTC AAT GTC TCC AGC ACC TTC GTT 339 Val Thr Pro Pro Gly Pro Glu Leu Val Leu Asn Val Ser Ser Thr Phe Val 19 CTG ACC TGC TCG GGT TCA GCT CCG GTG GTG TGG GAA CGG ATG TCC CAG GAG 390 Leu Thr Cys Ser Gly Ser Ala Pro Val Val Trp Glu Arg Met Ser Gin Glu 36 CCC CCA CAG GAA ATG GCC AAG GCC CAG GAT GGC ACC TTC TCC AGC GTG CTC 441 Pro Pro Gin Glu Met Ala Lys Ala Gin Asp Gly Thr Phe Ser Ser Val Leu 53 ACA CTG ACC AAC CTC ACT GGG CTA GAC ACG GGA GAA TAC TTT TGC ACC CAC 492 Thr Leu Thr Asn Leu Thr Gly Leu Asp Thr Gly Glu Tyr Phe Cys Thr His 70 AAT GAC TCC CGT GGA CTG GAG ACC GAT GAG CGG AAA CGG CTC TAC ATC TTT 543 Asn Asp Ser Arg Gly Leu Glu Thr Asp Glu Arg Lys Arg Leu Tyr He Phe 87 GTG CCA jGAT CCC ACC GTG GGC TTC CTC CCT AAT GAT GCC GAG GAA CTA TTC 594 Val Pro Asp Pro Thr Val Gly Phe Leu Pro Asn Asp Ala Glu Glu Leu Phe 104 ATC TTT CTC ACG GAA ATA ACT GAG ATC ACC ATT CCA TGC CGA GTA ACA GAC 645 He Phe Leu Thr Glu He Thr Glu He Thr He Pro Cys Arg Val Thr Asp 121 CCA CAG CTG GTG GTG ACA CTG CAC GAG AAG AAA GGG GAC GTT GCA CTG CCT 696 Pro Gin Leu Val Val Thr Leu His Glu Lys Lys Gly Asp Val Ala Leu Pro 138 GTC CCC TAT GAT CAC CAA CGT GGC TTT TCT GGT ATC TTT GAG GAC AGA AGC 747 Val Pro Tyr Asp His Gin Arg Gly Phe Ser Gly He Phe Glu Asp Arg Ser 155 TAC ATC TGC AAA ACC ACC ATT GGG GAC AGG GAG GTG GAT TCT GAT GCC TAC 798 Tyr He Cys Lys Thr Thr He Gly Asp Arg Glu Val Asp Ser Asp Ala Tyr 172 TAT GTC TAC AGA CTC CAG GTG TCA TCC ATC AAC GTC TCT GTG AAC GCA GTG 849 Tyr Val Tyr Arg Leu Gin Val Ser Ser He Asn Val Ser Val Asn Ala Val 189 CAG ACT GTG GTC CGC CAG GGT GAG AAC ATC ACC CTC ATG TGC ATT GTG ATC 900 Gin Thr Val Val Arg Gin Gly Glu Asn He Thr Leu Met Cys He Val He 206 GGG AAT GAT GTG GTC AAC TTC GAG TGG ACA TAC CCC CGC AAA GAA AGT GGG 951 Gly Asn Asp Val Val Asn Phe Glu Trp Thr Tyr Pro Arg Lys Glu Ser Gly 223 Table 1, page 2 CGG CTG GTG GAG CCG GTG ACT GAC TTC CTC TTG GAT ATG CCT TAC CAC ATC 1002 Arg Leu Val Glu Pro Val Thr Asp Phe Leu Leu Asp Met Pro Tyr His He 240 CGC TCC ATC CTG CAC ATC CCC AGT GCC GAG TTA GAA GAC TCG GGG ACC TAC 1053 Arg Ser He Leu His He Pro Ser Ala Glu Leu Glu Asp Ser Gly Thr Tyr 257 ACC TGC AAT GTG ACG GAG AGT GTG AAT GAC CAT CAG GAT GAA AAG GCC ATC 1104 Thr Cys Asn Val Thr Glu Ser Val Asn Asp His Gin Asp Glu Lys Ala He 274 AAC ATC ACC GTG GTT GAG AGC GGC TAC GTG CGG CTC CTG GGA GAG GTG GGC 1155 Asn He Thr Val Val Glu Ser Gly Tyr Val Arg Leu Leu Gly Glu val Gly 291 ACA CTA CAA TTT GCT GAG CTG CAT CGG AGC CGG ACA CTG CAG GTA GTG TTC 1206 Thr Leu Gin Phe Ala Glu Leu His Arg Ser Arg Thr Leu Gin Val Val Phe 308 GAG GCC TAC CCA CCG CCC ACT GTC CTG TGG TTC AAA GAC AAC CGC ACC CTG 1257 Glu Ala Tyr Pro Pro Pro Thr Val Leu Trp Phe Lys Asp Asn Arg Thr Leu 325 GGC GAC TCC AGC GCT GGC GAA ATC GCC CTG TCC ACG CGC AAC GTG TCG GAG 1308 Gly Asp Ser Ser Ala Gly Glu He Ala Leu Ser Thr Arg Asn Val Ser Glu 342 ACC CGG TAT GTG TCA GAG CTG ACA CTG GTT CGC GTG AAG GTG GCA GAG GCT 1359 Thr Arg Tyr Val Ser Glu Leu Thr Leu Val Arg Val Lys Val Ala Glu Ala 359 GGC CAC TAC ACC ATG CGG GCC TTC CAT GAG GAT GCT GAG GTC CAG CTC TCC 1410 Gly His Tyr Thr Met Arg Ala Phe His Glu Asp Ala Glu Val Gin Leu Ser 376 TTC CAG CTA CAG ATC AAT GTC CCT GTC CGA GTG CTG GAG CTA AGT GAG AGC 1461 Phe Gin Leu Gin He Asn Val Pro Val Arg Val Leu Glu Leu Ser Glu Ser 393 CAC CCT GAC AGT GGG GAA CAG ACA GTC CGC TGT CGT GGC CGG GGC ATG CCG 1512 His Pro Asp Ser Gly Glu Gin Thr Val Arg Cys Arg Gly Arg Gly Met Pro 410 CAG CCG AAC ATC ATC TGG TCT GCC TGC AGA GAC CTC AAA AGG TGT CCA CGT 1563 Gin Pro Asn He He Trp Ser Ala Cys Arg Asp Leu Lys Arg Cys Pro Arg 427 GAG CTG CCG CCC ACG CTG CTG GGG AAC AGT TCC GAA GAG GAG AGC CAG CTG 1614 Glu Leu Pro Pro Thr Leu Leu Gly Asn Ser Ser Glu Glu Glu Ser Gin Leu 444 GAG ACT AAC GTG ACG TAC TGG GAG GAG GAG CAG GAG TTT GAG GTG GTG AGC 1665 Glu Thr Asn Val Thr Tyr Trp Glu Glu Glu Gin Glu Phe Glu Val Val Ser 461 ACA CTG CGT CTG CAG CAC GTG GAT CGG CCA CTG TCG GTG CGC TGC ACG CTG 1716 Thr Leu Arg Leu Gin His Val Asp Arg Pro Leu Ser Val Arg Cys Thr Leu 478 CGC AAC GCT GTG GGC CAG GAC ACG CAG GAG GTC ATC GTG GTG CCA CAC TCC 1767 Arg Asn Ala Val Gly Gin Asp Thr Gin Glu Val He Val Val Pro His Ser 495 TTG CCC TTT AAG GTG GTG GTG ATC TCA GCC ATC CTG GCC CTG GTG GTG CTC 1818 Leu Pro Phe Lys Val Val Val He Ser Ala He Leu Ala Leu Val Val Leu 512 Table 1, page 3 ACC ATC ATC TCC CTT ATC ATC CTC ATC ATG CTT TGG CAG AAG AAG CCA CGT 1869 Thr He He Ser Leu He He Leu He Met Leu Trp Gin Lys Lys Pro Arg 529 TAC GAG ATC CGA TGG AAG GTG ATT GAG TCT GTG AGC TCT GAC GGC CAT GAG 1920 Tyr Glu He Arg Trp Lys Val He Glu Ser Val Ser Ser Asp Gly His Glu 546 TAC ATC TAC GTG GAC CCC ATG CAG CTG CCC TAT GAC TCC ACG TGG GAG CTG 1971 Tyr He Tyr Val Asp Pro Met Gin Leu Pro Tyr Asp Ser Thr Trp Glu Leu 563 CCG CGG GAC CAG CTT GTG CTG GGA CGC ACC CTC GGC TCT GGG GCC TTT GGG 2022 Pro Arg Asp Gin Leu Val Leu Gly Arg Thr Leu Gly Ser Gly Ala Phe Gly 580 CAG GTG GTG GAG GCC ACA GCT CAT GGT CTG AGC CAT TCT CAG GCC ACG ATG 2073 Gin Val Val Glu Ala Thr Ala His Gly Leu Ser His Ser Gin Ala Thr Met 597 AAA GTG GCC GTC AAG ATG CTT AAA TCC ACA GCC CGC AGC AGT GAG AAG CAA 2124 Lys Val Ala Val Lys Met Leu Lys Ser Thr Ala Arg Ser Ser Glu Lys Gin 614 GCC CTT ATG TCG GAG CTG AAG ATC ATG AGT CAC CTT GGG CCC CAC CTG AAC 2175 Ala Leu Met Ser Glu Leu Lys He Met Ser His Leu Gly Pro His Leu Asn 631 GTG GTC AAC CTG TTG GGG GCC TGC ACC AAA GGA GGA CCC ATC TAT ATC ATC 2226 Val Val Asn Leu Leu Gly Ala Cys Thr Lys Gly Gly Pro He Tyr He He 648 ACT GAG TAC TGC CGC TAC GGA GAC CTG GTG GAC TAC CTG CAC CGC AAC AAA 2277 Thr Glu Tyr Cys Arg Tyr Gly Asp Leu Val Asp Tyr Leu His Arg Asn Lys 665 CAC ACC TC CTG CAG CAC CAC TCC GAC AAG CGC CGC CCG CCC AGC GCG GAG 2328 His Thr Phe Leu Gin His His Ser Asp Lys Arg Arg Pro Pro Ser Ala Glu 682 CTC TAC AGC AAT GCT CTG CCC GTT GGG CTC CCC CTG CCC AGC CAT GTG TCC 2379 Leu Tyr Ser Asn Ala Leu Pro Val Gly Leu Pro Leu Pro Ser His Val Ser 699 TTG ACC GGG GAG AGC GAC GGT GGC TAC ATG GAC ATG AGC AAG GAC GAG TCG 2430 Leu Thr Gly Glu Ser Asp Gly Gly Tyr Met Asp Met Ser Lys Asp Glu Ser 716 GTG GAC TAT GTG CCC ATG CTG GAC ATG AAA GGA GAC GTC AAA TAT GCA GAC 2481 Val Asp Tyr Val Pro Met Leu Asp Met Lys Gly Asp Val Lys Tyr Ala Asp 733 ATC GAG TCC TCC AAC TAC ATG GCC CCT TAC GAT AAC TAC GTT CCC TCT GCC 2532 He Glu Ser Ser Asn Tyr Met Ala Pro Tyr Asp Asn Tyr Val Pro Ser Ala 750 CCT GAG AGG ACC TGC CGA GCA ACT TTG ATC AAC GAG TCT CCA GTG CTA AGC 2583 Pro Glu Arg Thr Cys Arg Ala Thr Leu He Asn Glu Ser Pro Val Leu Ser 767 TAC ATG GAC CTC GTG GGC TTC AGC TAC CAG GTG GCC AAT GGC ATG GAG TTT 2634 Tyr Met Asp Leu Val Gly Phe Ser Tyr Gin Val Ala Asn Gly Met Glu Phe 784 CTG GCC TCC AAG AAC TGC GTC CAC AGA GAC CTG GCG GCT AGG AAC GTG CTC 2685 Leu Ala Ser Lys Asn Cys Val His Arg Asp Leu Ala Ala Arg Asn Val Leu 801 • raoxe x, page 4 ATC TGT GAA GGC AAG CTG GTC AAG ATC TGT GAC TTT GGC CTG GCT CGA GAC 2736 He Cys Glu Gly Lys Leu Val Lys He Cys Asp Phe Gly Leu Ala Arg Asp 818 ATC ATG CGG GAC TCG AAT TAC ATC TCC AAA GGC AGC ACC TTT TTG CCT TTA 2787 He Met Arg Asp Ser Asn Tyr He Ser Lys Gly Ser Thr Phe Leu Pro Leu 835 AAG TGG ATG GCT CCG GAG AGC ATC TTC AAC AGC CTC TAC ACC ACC CTG AGC 2838 Lys Trp Met Ala Pro Glu Ser He Phe Asn Ser Leu Tyr Thr Thr Leu Ser 852 GAC GTG TGG TCC TTC GGG ATC CTG CTC TGG GAG ATC TTC ACC TTG GGT GGC 2889 Asp Val Trp Ser Phe Gly He Leu Leu Trp Glu He Phe Thr Leu Gly Gly 869 ACC CCT TAC CCA GAG CTG CCC ATG AAC GAG CAG TTC TAC AAT GCC ATC AAA 2940 Thr Pro Tyr Pro Glu Leu Pro Met Asn Glu Gin Phe Tyr Asn Ala He Lys 886 CGG GGT TAC CGC ATG GCC CAG CCT GCC CAT GCC TCC GAC GAG ATC TAT GAG 2991 Arg Gly Tyr Arg Met Ala Gin Pro Ala His Ala Ser Asp Glu He Tyr Glu 903 ATC ATG CAG AAG TGC TGG GAA GAG AAG TTT GAG ATT CGG CCC CCC TTC TCC 3042 He Met Gin Lys Cys Trp Glu Glu Lys Phe Glu He Arg Pro Pro Phe Ser 920 CAG CTG GTG CTG CTT CTC GAG AGA CTG TTG GGC GAA GGT TAC AAA AAG AAG 3093 Gin Leu Val Leu Leu Leu Glu Arg Leu Leu Gly Glu Gly Tyr Lys Lys Lys 937 TAC CAG CAG GTG GAT GAG GAG TTT CTG AGG AGT GAC CAC CCA GCC ATC CTT 3144 Tyr Gin Gin Val Asp Glu Glu Phe Leu Arg Ser Asp His Pro Ala He Leu 954 CGG TCC JCAG GCC CGC TTG CCT GGG TTC CAT GGC CTC CGA TCT CCC CTG GAC 3195 Arg Ser Gin Ala Arg Leu Pro Gly Phe His Gly Leu Arg Ser Pro Leu Asp 971 ACC AGC TCC GTC CTC TAT ACT GCC GTG CAG CCC AAT GAG GGT GAC AAC GAC 3246 Thr Ser Ser Val Leu Tyr Thr Ala Val Gin Pro Asn Glu Gly Asp Asn Asp 989 TAT ATC ATC CCC CTG CCT GAC CCC AAA CCT GAG GTT GCT GAC GAG GGC CCA 3297 Tyr He He Pro Leu Pro Asp Pro Lys Pro Glu Val Ala Asp Glu Gly Pro 1005 CTG GAG GGT TCC CCC AGC CTA GCC AGC TCC ACC CTG AAT GAA GTC AAC ACC 3348 Leu Glu Gly Ser Pro Ser Leu Ala Ser Ser Thr Leu Asn Glu Val Asn Thr 1022 TCC TCA ACC ATC TCC TGT GAC AGC CCC CTG GAG CCC CAG GAC GAA CCA GAG 3399 Ser Ser Thr He Ser Cys Asp Ser Pro Leu Glu Pro Gin Asp Glu Pro Glu 1039 CCA GAG CCC CAG CTT GAG CTC CAG GTG GAG CCG GAG CCG GAG CTG GAA CAG 3450 Pro Glu Pro Gin Leu Glu Leu Gin Val Glu Pro Glu Pro Glu Leu Glu Gin 1056 TTG CCG GAT TCG GGG TGC CCT GCG CCT CGG GCG GAA GCA GAG GAT AGC TTC 3501 Leu Pro Asp Ser Gly Cys Pro Ala Pro Arg Ala Glu Ala Glu Asp Ser Phe 1073 CTG TAGGGGGCTGGCCCCTACCCTGCCCTGCCTGAAGCTCCCCCGCTGCCAGCACCCAGCATCTCC 3567 Leu 1074 Table 1, page 5 TGGCCTGGCCTGGCCGGGCTTCCTGTCAGCCIAGGCTGCCCTTATCAGCTGTCCCCTTCTGGAAGCTT 3634 TCTGCTCCTGACGTGTTGTGCCCCAAACCCTGGGGCTGGCT'TAGGAGGCAAGAAAACTGCAGGGGCC 701 GTGACCΛGCCCTCTGCCTCCAGGGAGGCCAACTGACTCTGAGCCAGGGTTCCCCCAGGGAACTCAGT 3768 TTTCCCATATGTAAGATGGGAAAGTTAGGCTTGATGACCCAGAATCTAGGATTCTCTCCCTGGCT^ 3835 CAGGTGGGGAGACCGAATCCCTCCCTGGGAAGATTCTTGGAGTTACTGAGGT^ 3902 TTCTGTTC.AGCCAGCTACCCCTCAAGGAAT(_ATAGCTCTCTCCTCGCACTTTTATCCACCCAGGAGC 3969 TAGGGAAGAGACCCTAGCCTCCCTG-GCTGCTGGCIX^ 4036 CATCCAGAAGAAAGCCΛGTCTCCTCCCTATGATGCCAGTCCC.TGCGTTCCCTGGCCCGAGCTGGTCT 4103 GGGGCC-ATTAGGCAGCCTAATTAATGCTGGAGGCTGAGCCAAGTACAGGACACCCCCAGCCTGCAGC 4170 CCTTGCCCAGGGCΛCTTGGAGCACACGCAGCCATAGC_AAGTGCCTGTGTCCCTGTCCTTCAGGCCCA 4237 TCAGTCCTGGGGCTTTTTCTTTATCACCCTCAGTCTTAATCCATCCACCAGAGTCTAGAAGGCCAGA 4304 CGGGCCCCGCATCTGTGATGAGAATGTAAATGTGCCAGTGTGGAGTGGCCACGTGTGTGTGCCAGAT 371 ATGGCCCl_ * GGCTCTGCATTGGACCTGCTATGAGGCrTTGGAGGAATCCC^ 4438 AGTTTCCCCTTCAAAAAATGAATAAGTCGGACraATTAACTCrGAGTGCCTTGCCAGCACTAACATT 4505 CTAGAGTATCCAGGTGGTTGCACATTTGTCCAGATGAAGCAAGGCCATATACCCTAAACTTCCATCC 572 TGGGGGTCΛGCTGGG(TrcerGGGAGATTCCAGATCACACATCA ΛCTCTGGGGACTCAGGAAC 4639 CCCCTTCCCCAGGCCCCCAGCAAGTCTCAAGAACACAGCTGCACAGGCCTTGACTTAGAGTGACAGC 4706 CGG-JGTCCTGGAAAGCCCCCAGCAG rGCCCCAGGGACATGGGAAGACCACGGGACCTCTTTCACTA 4773 CCCACGATGACCTCCGGGGGTATCCTGGGCAAAAGGGACAAAGAGGGCAAATGAGATCACCTCCTGC 8 0 AGCCCACCACTCCAGCACCTGTGCCGAGGTCTGCGTCGAAGACAGAATGGACAGTGAGGACAGTTAT 907 GTCTTGTAAAAGA(_AAGAAGCTTCAGATGGGTACCC -AGAAGGATGTGAGAGGTGGGCGCTTTGGA 4974 GGTTTGCCCCTCΛCCCACCAGCTGCCCCATCCCTGAGGCAGCGCTCCATGGGGGTATGGTTTTGTCA 5041 CTGCCCAGACCTAGCAGTGACATCTCΛTTGTCCCCAGCCCAGTGGGCATTGGAGGTGCCAGGGGAGT 5108 CAGGGTTGTAGCCAAGACGCCCCCGCACGGGGAGGGTTGGGAAGGGGGTGCAGGAAGCTCAACCCCT 5175 CTGGGCACCLAACCCTGCATTGCΛGGTTGGCACCTTACTTCCCTGGGATCCCAGAGTTGGTCCAAGGA 5242 GGGAGAGTGGGTTCTCAATACGGTACOϋ^GATATAATCACCTA∞TTTACAAATATTTTTAGGACT 5309 CΛCGTTAACTCACATTTATACAGCAGAAATGCTATTTTGTATGCTGTTAAGTTTTTCTATCTGTGTA 5376 CTTTTTTCTAAGGGAAAGATTTTAATATTAAACCTGGTGCTT^ 5427 Table 2 discloses the sequence of an allele of an type A human platelet-derived growth factor receptor polypeptide. Both a nucleic acid sequence and its corresponding protein sequence are provided. The nucleic acid sequence corresponds to Seq. ID No. 5. The amino acid sequence corresponds to Seq. ID No. 4. Another human type A allele sequence is reported in Matsui et al. (1989) Science 243:800- 803. TftTff.fi ? Sequence of a human type A PDGF receptor polypeptide allele and protein TTGGAGCTACAGGGAGAGAAACAGAGGAGGAGACTGCAAGAGATCATTGGAGGCCGTGGGC 61 ACGCTCTTTACTCCATGTGTGGGACATTCATTGCGGAATAACATCGGAGGAGAAGTTTCCCAGAGCT 128 ATG GGG ACT TCC CAT CCG GCG TTC CTG GTC TTA GGC TGT CTT CTC ACA GGG 179 Met Gly Thr Ser His Pro Ala Phe Leu Val Leu Gly Cys Leu Leu Thr Gly -7 CTG AGC CTA ATC CTC TGC CAG CTT TCA TTA CCC TCT ATC CTT CCA AAT GAA 230 Leu Ser Leu He Leu Cys Gin Leu Ser Leu Pro Ser He Leu Pro Asn Glu 11 AAT GAA AAG GTT GTG CAG CTG AAT TCA TCC TTT TCT CTG AGA TGC TTT GGG 281 Asn Glu Lys Val Val Gin Leu Asn Ser Ser Phe Ser Leu Arg Cys Phe Gly 28 GAG AGT GAA GTG AGC TGG CAG TAC CCC ATG TCT GAA GAA GAG AGC TCC GAT 332 Glu Ser Glu Val Ser Trp Gin Tyr Pro Met Ser Glu Glu Glu Ser Ser Asp 45 GTG GAA ATC AGA AAT GAA GAA AAC AAC AGC GGC CTT TTT GTG ACG GTC TTG 383 Val Glu He Arg Asn Glu Glu Asn Asn Ser Gly Leu Phe Val Thr Val Leu 62 GAA GTG AGC AGT GCC TCG GCG GCC CAC ACA GGG TTG TAC ACT TGC TAT TAC 434 Glu Val Ser Ser Ala Ser Ala Ala His Thr Gly Leu Tyr Thr Cys Tyr Tyr 79 AAC CAC ACT CAG ACA GAA GAG AAT GAG CTT GAA GGC AGG CAC ATT TAC ATC 485 Asn His Thr Gin Thr Glu Glu Asn Glu Leu Glu Gly Arg His He Tyr He 96 TAT GTG CCA GAC CCA GAT GTA GCC TTT GTA CCT CTA GGA ATG ACG GAT TAT 536 Tyr Val Pro Asp Pro Asp Val Ala Phe Val Pro Leu Gly Met Thr Asp Tyr 113 TTA GTC-ATC GTG GAG GAT GAT GAT TCT GCC ATT ATA CCT TGT CGC ACA ACT 587 Leu Val He Val Glu Asp Asp Asp Ser Ala He He Pro Cys Arg Thr Thr 130 GAT CCC GAG ACT CCT GTA ACC TTA CAC AAC AGT GAG GGG GTG GTA CCT GCC 638 Asp Pro Glu Thr Pro Val Thr Leu His Asn Ser Glu Gly Val Val Pro Ala 147 TCC TAC GAC AGC AGA CAG GGC TTT AAT GGG ACC TTC ACT GTA GGG CCC TAT 689 Ser Tyr Asp Ser Arg Gin Gly Phe Asn Gly Thr Phe Thr Val Gly Pro Tyr 164 ATC TGT GAG GCC ACC GTC AAA GGA AAG AAG TTC CAG ACC ATC CCA TTT AAT 740 He Cys Glu Ala Thr Val Lys Gly Lys Lys Phe Gin Thr He Pro Phe Asn 181 GTT TAT GCT TTA AAA GCA ACA TCA GAG CTG GAT CTA GAA ATG GAA GCT CTT 791 Val Tyr Ala Leu Lys Ala Thr Ser Glu Leu Asp Leu Glu Met Glu Ala Leu 198 AAA ACC GTG TAT AAG TCA GGG GAA ACG ATT GTG GTC ACC TGT GCT GTT TTT 842 Lys Thr Val Tyr Lys Ser Gly Glu Thr He Val Val Thr Cys Ala Val Phe 215 AAC AAT GAG GTG GTT GAC CTT CAA TGG ACT TAC CCT GGA GAA GTG AAA GGC 893 Asn Asn Glu Val Val Asp Leu Gin Trp Thr Tyr Pro Gly Glu Val Lys Gly 232 Table 2 , page 2 AAA GGC ATC ACA ATG CTG GAA GAA ATC AAA GTC CCA TCC ATC AAA TTG GTG 944 Lys Gly He Thr Met Leu Glu Glu He Lys Val Pro Ser He Lys Leu Val 249 TAC ACT TTG ACG GTC CCC GAG GCC ACG GTG AAA GAC AGT GGA GAT TAC GAA 995 Tyr Thr Leu Thr Val Pro Glu Ala Thr Val Lys Asp Ser Gly Asp Tyr Glu 266 TGT GCT GCC CGC CAG GCT ACC AGG GAG GTC AAA GAA ATG AAG AAA GTC ACT 1046 Cys Ala Ala Arg Gin Ala Thr Arg Glu Val Lys Glu Met Lys Lys Val Thr 283 ATT TCT GTC CAT GAG AAA GGT TTC ATT GAA ATC AAA CCC ACC TTC AGC CAG 1097 He Ser Val His Glu Lys Gly Phe He Glu He Lys Pro Thr Phe Ser Gin 300 TTG GAA GCT GTC AAC CTG CAT GAA GTC AAA CAT TTT GTT GTA GAG GTG CGG 1148 Leu Glu Ala Val Asn Leu His Glu Val Lys His Phe Val Val Glu Val Arg 317 GCC TAC CCA CCT CCC AGG ATA TCC TGG CTG AAA AAC AAT CTG ACT CTG ATT 1199 Ala Tyr Pro Pro Pro Arg He Ser Trp Leu Lys Asn Asn Leu Thr Leu He 334 GAA AAT CTC ACT GAG ATC ACC ACT GAT GTG GAA AAG ATT CAG GAA ATA AGG 1250 Glu Asn Leu Thr Glu He Thr Thr Asp Val Glu Lys He Gin Glu He Arg 351 TAT CGA AGC AAA TTA AAG CTG ATC CGT GCT AAG GAA GAA GAC AGT GGC CAT 1301 Tyr Arg Ser Lys Leu Lys Leu He Arg Ala Lys Glu Glu Asp Ser Gly His 368 TAT ACT ATT GTA GCT CAA AAT GAA GAT GCT GTG AAG AGC TAT ACT TTT GAA 1352 Tyr Thr He Val Ala Gin Asn Glu Asp Ala Val Lys Ser Tyr Thr Phe Glu 385 CTG TTA ACT CAA GTT CCT TCA TCC ATT CTG GAC TTG GTC GAT GAT CAC CAT 1403 Leu Leu Thr Gin Val Pro Ser Ser He Leu Asp Leu Val Asp Asp His His 402 GGC TCA ACT GGG GGA CAG ACG GTG AGG TGC ACA GCT GAA GGC ACG CCG CTT 1454 Gly Ser Thr Gly Gly Gin Thr Val Arg Cys Thr Ala Glu Gly Thr Pro Leu 419 CCT GAT ATT GAG TGG ATG ATA TGC AAA GAT ATT AAG AAA TGT AAT AAT GAA 1505 Pro Asp He Glu Trp Met He Cys Lys Asp He Lys Lys Cys Asn Asn Glu 436 ACT TCC TGG ACT ATT TTG GCC AAC AAT GTC TCA AAC ATC ATC ACG GAG ATC 1556 Thr Ser Trp Thr He Leu Ala Asn Asn Val Ser Asn He He Thr Glu He 453 CAC TCC CGA GAC AGG AGT ACC GTG GAG GGC CGT GTG ACT TTC GCC AAA GTG 1607 His Ser Arg Asp Arg Ser Thr Val Glu Gly Arg Val Thr Phe Ala Lys Val 470 GAG GAG ACC ATC GCC GTG CGA TGC CTG GCT AAG AAT CTC CTT GGA GCT GAG 1658 Glu Glu Thr He Ala Val Arg Cys Leu Ala Lys Asn Leu Leu Gly Ala Glu 487 AAC CGA GAG CTG AAG CTG GTG GCT CCC ACC CTG CGT TCT GAA CTC ACG GTG 1709 Asn Arg Glu Leu Lys Leu Val Ala Pro Thr Leu Arg Ser Glu Leu Thr Val 504 GCT GCT GCA GTC CTG GTG CTG TTG GTG ATT GTG ATC ATC TCA CTT ATT GTC 1760 Ala Ala Ala Val Leu Val Leu Leu Val He Val He He Ser Leu He Val 521 Table 2 , page 3 CTG GTT GTC ATT TGG AAA CAG AAA CCG AGG TAT GAA ATT CGC TGG AGG GTC 1811 Leu Val Val He Trp Lys Gin Lys Pro Arg Tyr Glu He Arg Trp Arg Val 538 ATT GAA TCA ATC AGC CCA GAT GGA CAT GAA TAT ATT TAT GTG GAC CCG ATG 1862 He Glu Ser He Ser Pro Asp Gly His Glu Tyr He Tyr Val Asp Pro Met 555 CAG CTG CCT TAT GAC TCA AGA TGG GAG TTT CCA AGA GAT GGA CTA GTG CTT 1913 Gin Leu Pro Tyr Asp Ser Arg Trp Glu Phe Pro Arg Asp Gly Leu Val Leu 572 GGT CGG GTC TTG GGG TCT GGA GCG TTT GGG AAG GTG GTT GAA GGA ACA GCC 1964 Gly Arg Val Leu Gly Ser Gly Ala Phe Gly Lys Val Val Glu Gly Thr Ala 589 TAT GGA TTA AGC CGG TCC CAA CCT GTC ATG AAA GTT GCA GTG AAG ATG CTA 2015 Tyr Gly Leu Ser Arg Ser Gin Pro Val Met Lys Val Ala Val Lys Met Leu 606 AAA CCC ACG GCC AGA TCC AGT GAA AAA CAA GCT CTC ATG TCT GAA CTG AAG 2066 Lys Pro Thr Ala Arg Ser Ser Glu Lys Gin Ala Leu Met Ser Glu Leu Lys 623 ATA ATG ACT CAC CTG GGG CCA CAT TTG AAC ATT GTA AAC TTG CTG GGA GCC 2117 He Met Thr His Leu Gly Pro His Leu Asn He Val Asn Leu Leu Gly Ala 640 TGC ACC AAG TCA GGC CCC ATT TAC ATC ATC ACA GAG TAT TGC TTC TAT GGA 2168 cys Thr Lys Ser Gly Pro He Tyr He He Thr Glu Tyr Cys Phe Tyr Gly 657 GAT TTG GTC AAC TAT TTG CAT AAG AAT AGG GAT AGC TTC CTG AGC CAC CAC 2219 Asp Leu Val Asn Tyr Leu His Lys Asn Arg Asp Ser Phe Leu Ser His His 674 CCA GAG AAG CCA AAG AAA GAG CTG GAT ATC TTT GGA TTG AAC CCT GCT GAT 2270 Pro Glu Lys Pro Lys Lys Glu Leu Asp He Phe Gly Leu Asn Pro Ala Asp 691 GAA AGC ACA CGG AGC TAT GTT ATT TTA TCT TTT GAA AAC AAT GGT GAC TAC 2321 Glu Ser Thr Arg Ser Tyr Val He Leu Ser Phe Glu Asn Asn Gly Asp Tyr 708 ATG GAC ATG AAG CAG GCT GAT ACT ACA CAG TAT GTC CCC ATG CTA GAA AGG 2372 Met Asp Met Lys Gin Ala Asp Thr Thr Gin Tyr Val Pro Met Leu Glu Arg 725 AAA GAG GTT TCT AAA TAT TCC GAC ATC CAG AGA TCA CTC TAT GAT CGT CCA 2423 Lys Glu Val Ser Lys Tyr Ser Asp He Gin Arg Ser Leu Tyr Asp Arg Pro 742 GCC TCA TAT AAG AAG AAA TCT ATG TTA GAC TCA GAA GTC AAA AAC CTC CTT 2474 Ala Ser Tyr Lys Lys Lys Ser Met Leu Asp Ser Glu Val Lys Asn Leu Leu 759 TCA GAT GAT AAC TCA GAA GGC CTT ACT TTA TTG GAT TTG TTG AGC TTC ACC 2525 Ser Asp Asp Asn Ser Glu Gly Leu Thr Leu Leu Asp Leu Leu Ser Phe Thr 776 TAT CAA GTT GCC CGA GGA ATG GAG TTT TTG GCT TCA AAA AAT TGT GTC CAC 2576 Tyr Gin Val Ala Arg Gly Met Glu Phe Leu Ala Ser Lys Asn Cys Val His 793 CGT GAT CTG GCT GCT CGC AAC GTT CTC CTG GCA CAA GGA AAA ATT GTG AAG 2627 Arg Asp Leu Ala Ala Arg Asn Val Leu Leu Ala Gin Gly Lys He Val Lys 810 Table 2 , page 4 ATC TGT GAC TTT GGC CTG GCC AGA GAC ATC ATG CAT GAT TCG AAC TAT GTG 2678 He Cys Asp Phe Gly Leu Ala Arg Asp He Met His Asp Ser Asn Tyr Val 827 TCG AAA GGC AGT ACC TTT CTG CCC GTG AAG TGG ATG GCT CCT GAG AGC ATC 2729 Ser Lys Gly Ser Thr Phe Leu Pro Val Lys Trp Met Ala Pro Glu Ser He 844 TTT GAC AAC CTC TAC ACC ACA CTG AGT GAT GTC TGG TCT TAT GGC ATT CTG 2780 Phe Asp Asn Leu Tyr Thr Thr Leu Ser Asp Val Trp Ser Tyr Gly He Leu 861 CTC TGG GAG ATC TTT TCC CTT GGT GGC ACC CCT TAC CCC GGC ATG ATG GTG 2831 Leu Trp Glu He Phe Ser Leu Gly Gly Thr Pro Tyr Pro Gly Met Met Val 878 GAT TCT ACT TTC TAC AAT AAG ATC AAG AGT GGG TAC CGG ATG GCC AAG CCT 2882 Asp Ser Thr Phe Tyr Asn Lys He Lys Ser Gly Tyr Arg Met Ala Lys Pro 895 GAC CAC GCT ACC AGT GAA GTC TAC GAG ATC ATG GTG AAA TGC TGG AAC AGT 2933 Asp His Ala Thr Ser Glu Val Tyr Glu He Met Val Lys Cys Trp Asn Ser 912 GAG CCG GAG AAG AGA CCC TCC TTT TAC CAC CTG AGT GAG ATT GTG GAG AAT 2984 Glu Pro Glu Lys Arg Pro Ser Phe Tyr His Leu Ser Glu He Val Glu Asn 929 CTG CTG CCT GGA CAA TAT AAA AAG AGT TAT GAA AAA ATT CAC CTG GAC TTC 3035 Leu Leu Pro Gly Gin Tyr Lys Lys Ser Tyr Glu Lys He His Leu Asp Phe 946 CTG AAG AGT GAC CAT CCT GCT GTG GCA CGC ATG CGT GTG GAC TCA GAC AAT 3086 Leu Lys Ser Asp His Pro Ala Val Ala Arg Met Arg Val Asp Ser Asp Asn 963 GCA TAC ATT GGT GTC ACC TAC AAA AAC GAG GAA GAC AAG CTG AAG GAC TGG 3137 Ala Tyr He Gly Val Thr Tyr Lys Asn Glu Glu Asp Lys Leu Lys Asp Trp 980 GAG GGT GGT CTG GAT GAG CAG AGA CTG AGC GCT GAC AGT GGC TAC ATC ATT 3188 Glu Gly Gly Leu Asp Glu Gin Arg Leu Ser Ala Asp Ser Gly Tyr He He 997 CCT CTG CCT GAC ATT GAC CCT GTC CCT GAG GAG GAG GAC CTG GGC AAG AGG 3239 Pro Leu Pro Asp He Asp Pro Val Pro Glu Glu Glu Asp Leu Gly Lys Arg 1014 AAC AGA CAC AGC TCG CAG ACC TCT GAA GAG AGT GCC ATT GAG ACG GGT TCC 3290 Asn Arg His Ser Ser Gin Thr Ser Glu Glu Ser Ala He Glu Thr Gly Ser 1031 AGC AGT TCC ACC TTC ATC AAG AGA GAG GAC GAG ACC ATT GAA GAC ATC GAC 3341 Ser Ser Ser Thr Phe He Lys Arg Glu Asp Glu Thr He Glu Asp He Asp 1048 ATG ATG GAC GAC ATC GGC ATA GAC TCT TCA GAC CTG GTG GAA GAC AGC TTC 3392 Met Met Asp Asp He Gly He Asp Ser Ser Asp Leu Val Glu Asp Ser Phe 1065 CTG TAAC-TGGCGGATTCGAGGGGTTCCTTCCACTTCTGGGGCCACCTCTGGATCCCGTTCAGAAAA 3458 Leu 1066 CCACTTTATTGCAATGCGGAGGTTGAGAGGAGGACTTGGTTGATGTTTAAAGAGAAGTTCCCAGCCA 3525 AGGGCCTCGGGGAGCCΓTTCΓAAATATGAATGAATGGGATATTTTGAAATGAACITΓGTCAGTGTTG 3592 CCTCTTGCAATGCCTCAGTAGCATCTCAGTGGTGTGTGAAGTTTGGAGATAGATGGATAAGGGAATA 3659 ATAGGCCACAGAAGGTGAACTTTCTGCTTCAAGGACATTGGTGAGAGTCCAACAGACACAATTTATA 3726 Table 2, page 5 CTOCGACAGAA C_ T TC A G CA T T G TAA TT ATGTAAATAAC T C T AACCAC G;C T G T GTTTAGATTGTATT 3793 AACTAT C TT C T TTGGACTTCTGAAGAG A CCAC T C AA T CCΛ T CCA T GTA C TT CCCTCTTGAAACCTGA 3860 TGTCAGCTGCTGTTGAACΓΓTTTAAAGAAGTGCATGAAAA^ 3927 TACTATAGCATTTTGCTATCTTTTTTAGTGTTAAAGAGAT^ 3994 TAATAGATTTGGGTCATTTAGAAGCCTGACAACRCATTTTCATATTGTAATCTATGTTTATAATACT 4061 ACTACTGTTATCAGTAATGCTAAATGTGTAATAATGTAACATGATTTCCCTCCACAO_AAG(ΛCAAT 4128 TTAAAAACAATCCTTACTAAGTAGGTGATGAGTTTGACAGTTTT^^ 4195 TTTCTCTATAAAGTATGGTAATAGCTTTAGTGAATTAAATTTAG*ITGAGC_ATAGAGAACAAAGTAAA 4262 AGTAGTGTTGTCCAGGAΛGTCAGAATTTTTAACRI-CTACTGAΛ^ 4329 AAAACAATTAACTGCCCTCTGAAATAATGGGATTAGAAAC_AAACAAAACTCTTAAGTCCTAAAAGTT 4396 CTΑ Ϋ -TGTAGAGGCATAAACCTGTGCTGAA<^TAACTTCTCATGTATATTACCCAATGGAAAATATA 4463 ATGATC-AGCGCANAAAGACTGGATTTGCAGAAGTTNl-'l l l'l l 530 TTTGGCGACCCCAATATATGTATTTTTTGAATCTATGAACC^^ 4597 ACATCAGCCrCC-r C rrCACCCCTTACCCCAAAGAGAAAGAGTTTGAAACTCGAGACCATAAAGAT 4664 ATTCTTTAGTGGAGGCTG-GAAGTGCATTAGCCTGATCCTCAGTTCTCAAATGTGTGTGGCAGCCAGG 4731 TAGACTAGTACCTGGGTTTCC-ATCCTTGAGATTCTGAAGTATGAAGT 4798 TATTTTTCTAAACTCCCTGGCTGTTCTGATCGGCCAGGTTTCG-GAAACΛCrc 4865 AGTTGCCATGGGAAACAAATAATTTGAACTTTGGAAα GGGTTCTTAλGTTGGTGCGT 4932 GATAAATTTAGGAACCCLAAGTCC_AATCACI * GTAAATTAC^ 4999 AATTGAAAGGTCAGAATCGACTCCGACTCTTTCGATTTCAAACC^^ 5066 TTCTACGATGAAGGGTGACATACCCCCTerAACTTGAAAGGGGCAGAGGGCAGAAGAGCGGAGGGTG 5133 AGGTATGGGGCGGTTCCTTTCCGTACATGTTTTTAATACGTTAAGTCA _AGGTTCAGAGACACATT 5200 GGTCGAGTCAO_AAACCACCTTTTTTGTAAAATTα_AAATGACTATTAAACT 5267 ACTTAACΛGTGTAGATAGGTGTGACΛGTTTGTCCAACCACACCCAAGTAACCGTAAGAAACGTTATG 5334 ACGAATTAACGACTATG<5TATACraACTTTGTACCCGACACTAATGACGTTAGTGACACGATAGCCG 5 01 TCTACTACGAAACCTTCTACGTCrrTCGTTATTATTTCATGAACTGATGGATGACCΛCA^ 5468 CGTTCGGGGTTGAAAGAATAGGTTGAAAAAGTATCATTCACGCTTCTGACT 5535 'l'l Tr M l* Υl*GGACTGATCCAAGA<^ 5602 TGTCGAGTTCGTAAGACAAATAGCGAGTGAGAGGGAACATGTCGGAATAAAACAACCACGAAACGTA 5669 AAACTATAACGACIACTCGGAACGTACTGTAGTACTCCGGCCTACTTTGAAGAGTCAGGTCGTCAAAG 5736 GTCAGGATTGTTTACGAGGGTGGACTTAAACATATACTGACGTAAACACCCACACACACACAAAAGT 5803 rørTTAAGGTCTAλACAAAG-GAAAACCGGAGGACGTTTCAG^ 5870 GATGAAAGATAAAAATACTACTGTTAGTTTCG»GCCGGACTCTTTGTGATAAACΛCTGAAAAATTTGC 5937 TAATCACTΓACAGGAATTTTACACCAGACGCTTAGACATGTTTTACCAGGATAAAAACACTTCTCCCT 6004 GTATTCTATTTTACTACAATATGTAGTTATA(^TATATACATAAAGATATATCTGAACCTCTTATGA 6071 CGGTTTTGTAAATACTGTTCGACATAGTGACGGAAGCAAATATAAAAAAATTGACACTATTAGGGGT 6138 GTCCGTGTAATTGAO^CGTGAAAACrrACAG^TTTTAAATATAAAATCrrTTATTAri 6205 ATGAATGTACAAGGGTTTTGTTACCACACCACTTACACΛCTCTTTTTGATTG2 ACTATCCCAGATGG 6272 TTATGTTTTACATAATGCraACGGGGACAAGTACAAAAACAAAATTTTGCACATTTACraCT 6339 TATAAAGTTATTTACTATATATTAAATTTCCTTAAG 6375 A polypeptide or nucleic acid is substantially pure, or substantially purified, when it comprises at least about 30% of the respective polymer in a composition, typically at least about 50%, more typically at least about 70%, usually at least about 80%, more usually at least about 90%, preferably at least about 95%, and more preferably about 98% or more. The soluble fragments of the extracellular region will generally be less than about 400 amino acids, usually less than about 350 amino acids, more usually less than about 300 amino acids, typically less than about 200 amino acids, and preferably less than about 150 amino acids. A. D Domains Based on a number of observations, the extracellular region (XR) of these PDGF receptor polypeptides comprises 5 immunoglobulin-like domains. First, the amino acid sequence contains 5 segments characteristic of Ig-like domain structures, each of the segments having an appropriate size for an immunoglobulin domain. Each segment, except for the fourth, has characteristically spaced cysteine residues that are a diagnostic feature of an immunoglobulin-like domain. The receptor polypeptide sequence displays other features of immunoglobulin-like domain structure, e.g., the presence of characteristically positioned tryptophan and tyrosine residues. Direct sequence comparisons of segments of the receptor polypeptides with corresponding segments of true immunoglobulin domains shows a statistically significant similarity between PDGF receptor polypeptide domains and immunoglobulin domains. See, e.g., Williams (1989) Science 243: 1564-1570. The argument that the receptor polypeptide domains assume the folding pattern of immunoglobulin domains can be strengthened by examining the predicted secondary structure of the receptor polypeptides. When a homology mapping analysis is performed, the PDGF receptor polypeptide shows five Ig-like domains in the extracellular region, each domain showing statistically significant homology to defined Ig-like domains. See, e.g., Williams and Barclay (1988) Ann. Rev. Immunol. Biochem. 6: 381- 405. Regions of homology will show significant sequence homology to particular Ig-like domains, and exhibit particular secondary and tertiary structural motifs characteristic of Ig- like domains. The domain structures will preferably be those segments with boundaries which approximately match the boundaries of the domain structures. The boundaries will preferably match within about 9 amino acids, typically within about 7 amino acids, more typically within about 5 amino acids, usually within about 3 amino acids, and more usually within 1 amino acid. See, e.g. , Cantor and Schimmel (1980) Biophysical Chemistry. Vols I-III, Freeman and Co., San Francisco; Creighton (1984) Proteins: Structure and Molecular Properties. Freeman and Co., New York; and Watson et al. (1987) The Molecular Biology of the Gene. Vols 1 and 2, Benjamin, Menlo Park, California; each of which is hereby incorporated herein by reference. The sequences of the human type B and the human type A receptor polypeptides can be analyzed to predict their beta strand topology. Combining a Fourier analysis of hydrophobic sequence pattern and a Garnier-Robson algorithm, see, e.g., Gamier et al. (1978) J. Mol. Biol. 120: 97, with a turn predictor program, as reported in Cohen et al. (1986) Biochemistry 25: 266, produces a characteristic structural pattern. This pattern exhibits consensus /9-strand segments in each domain when analysed as described. The first two Ig-like domains of the PDGF receptor polypeptides, Dl and D2, have about seven /3-strand segments, designated the A, B, C, D, E, F, and G segments, as listed from amino proximal to carboxy proximal direction. The third, fourth and fifth Ig-like domains, D3, D4 and D5, are long enough to include an extra 3-strand segment, designated C. The fifth domain, D5, most closely resembles a variable heavy chain domain in length. The type B receptor polypeptide D5 further comprises an additional 3-strand segment designated C". These features and designations are based partly on the homology of segments between domains and segments in the type B and type A hPDGF-R polypeptides, and with the mouse type B PDGF receptor polypeptide, and also based upon homology to other Ig- like segments found on other proteins, particularly other growth factor receptor proteins. The csf-1 receptor and c-kit proto-oncogene have similar Ig-like domain organizations. See, e.g., Williams (1989) Science 243:1564-1570. The domain structure is based, in part, upon features common to Ig-like domains found in other proteins, including related receptors. See, e.g., Ullrich and Schlessinger (1990) Cell 61:203-212; and Yarden and Ullrich (1988) Ann. Rev. Biochem. 57:443-78. The domain boundaries for the two alleles disclosed herein are identified below, but different alleles may have slightly different positions for the boundaries. See Table 14. The Ig-like domains (D domains) are characterized by the regularity of spacing of cysteine residues in the extracellular region. These five D domains, each about 100 amino acids in length, have / 8-sheet rich structures, resembling immunoglobulin variable or constant regions. See, Williams (1989) Science 243:1964-1570. The natural XR domains are numbered from the amino proximal domain Dl, in order, through D5, at the carboxy proximal end of the XR. The exon structure of the mouse type B PDGF receptor polypeptide gene also matches this domain structure with reasonable fidelity. The correlation between the intron-exon structure and functional units further supports the hypothesis that the boundaries define functional units of the polypeptide. See, e.g., Williams and Barclay (1988) Ann. Rev- τwmmnr.1. Biochem. 6:381-405. The boundaries for each of these segments are indicated below for the two alleles disclosed herein, and similar boundaries will be found in other alleles at locations of sequence and functional homology. The amino-proximal Ig-like domain of the huma platelet-derived growth factor receptor polypeptides is designated Dl. The Dl domain extends from about leu(l) to pro(91) in the type B receptor polypeptide, and from about gln(l) to pro(101) in the type A receptor polypeptide. See Table 14. The Dl domain apparently has about seven /3-sheet segments. TABU 14 Human B-Type Receptor Polypeptide 0-etrand Segment Approximate Boundariea Dl D2 D3 D4 D5 whole lie (182) gly (282) tyr (283) pro (384) val (3β5) - lya (49 A aer (lβS) val (192) leu (286) gin (294) val (385) - glu (39 B lie (199) lie (206) arg (300) glu (309) gin (400) - arg (40 C aan (212) pro (21β) thr (315) aap (321) ■an (413) cys (41 C arg (224) pro (228) aap (327) g y (331) arg (424) leu (42 c glu (439) glu (44 D aap (231) - pro (237) ■er (336) - glu (342) val (448) glu (45 E aer (242) - aer (240) ■er (347) - arg (353) val (459) leu (46 F gly (255) - glu (263) gly (360) - hla (368) leu (472) ■■n (48 G glu (271) - val (278) ■er (376) - pro (384) glu (488) his (49 Human Λ-Type Receptor Polypeptide 0-atrand Segment Approximate Boundariea Dl D2 D3 D4 D5 aap (102) - aer (189) glu (190) gly (290) phe (291) pro (391) aer (392) - glu (50 pro (107) - val (115) glu (194) val (201) 11a (294) glu (302) aer (392) - aap (39 ala (123) - thr (130) 11a (208) phe (215) lya (310) ■rg (317) gin (408) - glu (41 pro (135) - aer (141) •«P (Ml) pro (227) arg (323) •an (329) aap (421) - cya (42 lya (233) met (237) glu (335) thr (338) lye (432) - thr (43 val (144) - aer (148) glu (240) aer (245) asp (343) - glu (349) i e (453) - arg (45 gin (153) - aan (156) tyr (250) glu (256) aer (354) - arg (360) val (461) - phe (46 gly (162) - val (170) gly (263) gin (271) gly (367) - aan (375) lie (474) - aβn (48 lie (178) - lya (186) met (279) hla (267) thr (383) - pro (391) glu (490) - pro (49 The next Ig-like domain, in the carboxy proximal direction of natural human platelet-derived growth factor receptor polypeptides, is designated D2. The D2 domain extends from about thr(92) to ser(181) in the type B receptor polypeptide, and from about asp(102) to ser(189) in the type A receptor polypeptide. The D2 domain apparently also has about seven β-sheet strands designated A, B, C, D, E, F, and G. The third Ig-like domain found on natural human PDGF receptor polypeptides is designated D3. The D3 domain extends from about ile(182) to gly(282) in the type B receptor polypeptide, and from about glu(190) to gly(290) in the type A receptor polypeptide. The D3 domain apparently has about eight 3-sheet strands designated A, B, C, C, D, E, F, and G. The fourth Ig-like domain found in the natural human PDGF receptor polypeptides is designated D4. The D4 domain extends from about tyr(283) to pro(384) in the type B receptor polypeptide, and from about phe(291) to pro(391) in the type A receptor polypeptide. The D4 domain apparently has about eight /S-sheet strands. Note that the D4 domains lack the characteristic cysteine residues, which correspond to val(306) and met(364) in the type B sequence shown, and to val(313) and ile(371) in the type A sequence shown. The fifth Ig-like domain is designated D5. The D5 domain extends from about val(385) to lys(499) in the type B receptor polypeptide, and from about ser(392) to glu(501) in the type A receptor polypeptide. The D5 of the type B receptor polypeptide has about nine putative /3-sheet strand segments designated A, B, C, C, C", D, E, F, and G, while the type A receptor polypeptide has only about eight /3-strand segments, lacking a C" segment. The approximate boundaries of the domains and /S- strand segments are listed in Table 14. The apparent alignments of the segments are illustrated in Tables 4 and 5. Other alleles of the receptor polypeptides may also be analyzed by either homology or the structural analysis as described above. a B-type receptor polypeptide amino acid sequence, with 0-strand segment alignment TABU 4 Domain I __ WTPPGPEL VI.NVSST FVl.T C SGS AP WWERM SQEP PQ EHA AQD GTFS SVLTLTN LTG1.DT GEYF C THND SRGl.ETD ERKRl.YIFV PDP TVGFL PNDAEEI.FI FI.TEITE ITIP C RVT DPQL WTLHEK KGDV ALPVP YDIIQ RGFS. . . .G1FED RSYI C KTTI GDREVDS DAYYVYHLQ VSS 1HV SVNΛVQT.V VR.QCET. ITUI C 1VI CND.. ,W NFEWTYP RKESG RLVEP VT DFLLDMP YIIIR SILHIPS AELEDS GTYT C NVTE SVNDHQD EKAINITW ESG Domain 4 YVR LLGEVGTLQ FΛELIIRS RTLQ V VFE AYPP..P TVLWFKD NRTLG DSSAG EIAL STRNVSE TRYV SELTLVR VKVAEA GHYT M RAFH EDAEVQL SFQI.QINVP Domain 5 .VRVI.ELSE SHPDSGE...QTVR C RGR CMPQ..P NIIHSAC RD. K RCPREL PPTLLGNSS EEE SQLETN VTYWEEE QEFE WSTLRL QHVDRP LSVR C TLRN AVGQDTQ EVIWP HSLPFK bbbbbbbbb bbbb b bbb bbbbbbb bbbbbb bbb bbbbbbb bbbbbbb bbbb b bbbb bbbbbb A B C C' C- D E F G an A-type receptor polypeptide amino ac VAFV PLGMTDYLV IVEDDDS AIIP C RTT DPET PVTLHNS EG WPAS YDSR QGFN .GTFTV GPYI C EATV KGKKFQT IPFNVYALK A Domain 3 ELDL EMEALKT.V YK.SGET IWT C AVF NNE DLQWTYP GEVKG .KGITt-t LE EIKVPS 1KLV YTLTVPE ATVKDS GDYE C AARQ ATREVKE MKKVTISVH E Domain 4 FIE IKPTFSQLE AVNLIIEV KHF V VEV RΛYPP...P RISWLKN NLTLI E.. -NLT EITT DVE KIQE IRYR SKLKLIR AXEEDS GHYT I VAQN EDΛVKSY TFELLTQVP Domain 5 .SSILDLVD DHHGSTGG QTVR C TAE GTPL P DIEUHIC KD.IK KCNNETS HTILANNV ... SNIITE I HSR DRST VEGRVTF AKVEET IAVR C LAKN LLCAENR ELKLVA..P T bbbbbbbbb bbbb b bbb bbbbbbb bbbbbbb bbb bbbbbbbbbbb bbbbbbb bbbb b bbbb bbbbbbbbb A B C c- C" D F G The prototypical Dl domains are those sequences of the human type B receptor polypeptide and the human type A receptor polypeptide, as described. However, compatible amino acid substitutions, insertions, and deletions which preserve the desired ligand binding functions can be made. The function will usually be preserved by retaining the LBR segments in the correct orientation by use of appropriate structured segments. Conservative substitutions typically include substitutions within the following groups: glycine, alanine; valine, isoleucine, leucine; aspartic acid, glutamic acid; asparagine, glutamine; serine, threonine; lysine, arginine; and phenylalanine, tyrosine. Substitution or exchange of 0-sheet segments or sequences intermediate the segments from different domains may be performed, including between type B and A receptor polypeptides, or between different domains of another related receptor polypeptide. Segments outside the prototypical cysteines within /3-segments B and F (but val(306) and met(364) in the type B D4, and val(313) and ile(371) in the type A D4) will be usually less critical than the sequences between those residues, e.g., the C, C , C", D; and E 0-strand segments. Also, segments homologous to these disclosed segments may be substituted, including those with compatible amino acid substitutions, insertions, and deletions. Sources of similar domains and segments include related receptor polypeptides from human or other mammalian species. Non- mammalian receptor polypeptides may also exhibit significant homology and serve as sources for similar segments. Other Ig- like domains and segments may also be substituted. The present invention embraces polypeptides which exhibit homology to the disclosed and described segments and domains. It embraces segments comprising contiguous amino acids of the sequences disclosed, typically at least about 8 contiguous amino acids, more typically at least about 11 contiguous amino acids, usually at least about 14 contiguous amino acids, more usually at least about 17 contiguous amino acids, and preferably at least about 21 or more contiguous amino acids. Constructs retaining the LBR segments are most valuable. The invention also includes modifications of those sequences, including insertions, deletions, and substitutions with other amino acids. Glycosylation modifications, either changed, increased amounts, or decreased amounts, as well as other sequence modifications are envisioned. Thus, the modified proteins comprising these amino acid sequences, e.g., analogues, will usually be substantially equivalent to these proteins in either function or structure. The / S-sheet strands may be slightly enlarged or shortened by respective insertions or deletions in the polypeptide sequence. Thus, certain embodiments will have a slightly enlarged or shortened particular domain by adding or deleting particular sequences of /3-sheet strands or their inter-strand sequences. Segments may be inserted or deleted which conform to the structural requirements of retaining the proper intra- and inter-domain interactions. In particular, changes which interrupt the secondary and tertiary structure of the protein will be disfavored. See, e.g.. Cantor and Schimmel (1990) and Creighton (1984) . In addition, amino acids or segments may be inserted or deleted in the regions outside of the /3-sheet strands and between domains. Typically the substitutions will be of amino acids having similar properties, and additions or deletions would preferably be selected among those which retain receptor biological functions, e.g., ligand binding. The sequence of a / 8-sheet segment will typically not differ from a sequence from a human type B polypeptide or a human type A polypeptide by greater than about 50%, more typically less than about 39%, usually less than about 29%, and more usually less than about 20%. Comparable similarities over each of the non-/3-sheet strands of each domain will be preferred. The boundaries between domains are defined, in part, by the definitions for domains in the Ig-like domains. Examples of similar domains are found in immunoglobulin and growth factor receptor polypeptides. The domain boundaries between Dl and D2; D2 and D3; D3 and D4; and D4 and D5 correspond approximately to exon locations, further supporting the proposal that the domain structures correspond to evolutionary and functional units. See, e.g., Watson et al. (1987) The Molecular Biology of the Gene, vols. 1 and 2, Benjamin, Menlo Park, California. The D2 domains have similar characteristics to the Dl domains, as shown by the alignments illustrated in Tables 4 and 5. Both domains have β-sheet segments designated A, B, C, D, E, F, and G. The domain 3 segments, or D3, also exhibit homology, but have an additional /3-strand segment designated C " . The D4 segments, or D4, have non-cysteine residues at the positions which typically correspond to cysteines in the other domains. In the type B allele shown, the residues are val(306) and me (364) , while in the type A allele shown, the residues are val(313) and ile(371) . The D4 domains also have /9-strand segments designated C. The domain 5, or D5, have the consensus cysteine residues and the additional C 3-strand segments, and the type B receptor polypeptide has an additional C" 3-strand segment. The present invention provides for various constructs comprising ligand binding constructs, typically comprising substantially intact domains. These constructs will have various uses,e.g., for binding ligands, or substituting for intact receptor poiypeptides. For example, each of the separate domains may comprise a separate polypeptide alone, or may be fused to another peptide, such as the TM and IR regions of a receptor polypeptide, e.g., hPDGF-R. See, e.g.. Table 6. These individual single domain polypeptides will exhibit specific activity associated with these specific domains, preferably as an agonist or antagonist for ligand binding, preferably with characteristics shared with the intact receptor polypeptide or XR. The domains may also preferably serve as competitive inhibitors of PDGF-R polypeptides, competing with natural PDGF-receptors to bind ligands. The present invention also provides repetitive sequences of a single domain. For example, a Dl domain by itself is provided, a Dl-Dl dimer in a single polypeptide is provided, a Dl-Dl-Dl triplet repeat is also provided. Likewise up to a large number of Dl domains which will exhibit many functions, e.g., immunological properties, characteristic of various natural PDGF-R sequences. Similar constructs of each of D2, D3, D4, and D5 are provided, along with combinations. See Tables 6, 7, 8, 9 and 10. These will often be soluble fragments of the XR, or may be fused to other polypeptides, including a PDGF-R TM segment, preferably with an IR segment also. TABLE 6 XR domain structure of single domain forms Dl D2 D3 D4 D5 XR domain structure of three domain forms Dl-W D2-W D3-W D4-W D5-W where W is each of the 25 possible combinations listed in TABLE 2, giving a total of 125 elements in this table TABLE 9 XR domain structure of four domain forms Dl-X D2-X D3-X D4-X D5-X where X is each of the 125 possible combinations listed in TABLE 5, giving a total of 625 elements in this table TABLE 10 XR domain structure of five domain forms Dl-Y D2-Y D3-Y D4-Y D5-Y where Y is each of the 625 possible combinations listed in TABLE 6, but not including the combination D1-D2-D3-D4-D5, giving a total of 3124 elements in this table In addition, the present invention provides similar structures with spacer regions between the domain structures. In particular, the regions corresponding to the intra-cysteine residues of the domains shown in Tables 4 and 5 are useful. For example, a spacer polypeptide may be inserted between adjacent domains or do spaces between the important ligand binding segments, typically found within the intra-cysteine segments described, e.g., the B, C, C, C", D, E, and F β- strand segments. Thus, for example, a polypeptide of the structure D1-X1-D2 is provided where XI is a spacer segment which is not a D domain. The order of the domains may be reversed, and the invention also provides polypeptides such as D2-D1, or D2-X1-D1. In particular, the non-D domain character of Xl is provided to avoid the peptide D1-X1-D3 from describing, or encompassing, D1-D2-D3. Another particularly preferred embodiment of the invention is a polypeptide having the described extracellular region domain structure combined with other segments of a human platelet-derived growth factor receptor, particularly the transmembrane segment (TM) and the intracellular region (IR) . Thus, the present invention provides for a receptor polypeptide which either has a modified order of the extracellular region domains in the amino to carboxy direction, e.g., a D5-D4-D3-D2- Dl-TM-IR polypeptide, or, in some cases reversal of various domains. It also provides for a receptor polypeptide with a deleted intact domain and for a receptor polypeptide having an additional domain added to it. Examples include D1-D2-D3-TM- IR, or D1-D2-D3-D4-TM-IR. In particular, fusions with the XR segments described in Tables 6, 7, 8, 9, and 10 are preferred embodiments. The modified combinations of the D domains are expected to both simulate and differ from the natural receptor. The modified polypeptide would be expected, in some embodiments, to exhibit a modified binding affinity, e.g., higher or lower affinity, or to exhibit a different spectrum of binding to different ligands or ligand analogues. They may also have an altered ligand binding transducing efficiency, or a modified inter-chain association affinity. The present invention provides the means for determining the minimal structural features necessary to perform various functions of the extracellular region of platelet-derived growth factor receptors, preferably human receptors. Although similar determinations may be performed in mouse or other mammalian species, the human receptor will typically be preferred for diagnostic or therapeutic purposes. To determine the minimal region necessary for a functional activity, e.g., ligand binding, an assay for that activity is developed. The main receptor functions, as indicated above, include ligand binding, tyrosine kinase activity, and receptor dimerization. Simple and quick assays for each of these molecular functions may be developed. Ligand binding assays are described, e.g., in Gronwald et al. (1988) Proc. Nat'l Acad. Sci. USA 85:3435-3439; Heldin et al. (1988) EMBO J. 7:1387-1393; and Escobedo et al. (1988) Science 240:1532-1534. Receptor dimerization assays are described, e.g., in Yarden and Schlessinger (1987) Biochemistry 26:1434- 1442 and 1443-1451. As an alternative means for determining sites which interact with specific other proteins, physical structure determination, e.g. , x-ray crystallography or 2 dimensional NMR techniques, will provide guidance as to which amino acid residues form the molecular contact regions. For a detailed description of protein structural determination, see, e.g., Blundell and Johnson (1976) Protein Crystallography, Academic Press, New York, which is hereby incorporated herein by reference. Ligand binding assays may include binding of labeled ligand or competition assays for binding. Signal transduction may be indirectly assayed by measuring an activity modulated by ligand binding, e.g., tyrosine kinase activity, or some measure of a conformational or other change in receptor structure. For example, an antibody or other binding protein which specifically binds or dissociates from the receptor polypeptide upon ligand binding may be used. Receptor dimerization may be measured by a proximity assay, including a fluorescence quenching or other spectroscopic measurement. Various proximity assays are known, see, e.g. , Ullrich and Schlessinger (1990) Cell 61:203-212; Yarden and Schlessinger (1987) Biochemistry 26:1434-1942 and 1443-1451; each of which is hereby incorporated herein by reference. Once an assay has been developed, various combinations of domain or other segments, e.g., LBR's, can be tested for affecting that activity. A competitive inhibition assay will detect those constructs which can bind the ligand. The first domain structures to try will ordinarily be the individual domains, either alone or linked to chimeric proteins or the TM-IR segment of the receptor. Various alleles, modifications to the individual domains, or related chimeric domains would be tested. Both deletion and chimeric proteins will be constructed. Various combinations of each domain will be constructed and tested to select those which affect the measured activity. Repeats of those domains should be tested, e.g,., Dl-Dl. If no single domain does affect the function, then various 2 domain constructs, in order, would be tried, e.g., D1-D2-TM-IR, D2-D3-TM-IR, D3-D4-TM-IR, and D4-D5-TM-IR. Selected combinations listed in Tables 6, 7, 8, 9, and 10 will be constructed and tested. In order to produce soluble forms, it will often be desireable to attach appropriate amino terminal segments, some of which would be expected to be present in the Dl domain or in the precursor form. Correct secretion and processing may be dependent upon various amino proximal features, such as signal sequences, and other features essential for correct targeting and processing. See, e.g., Watson et al. (1987) The Molecular Biology of the Gene, vols. 1 and 2, Benjamin, Menlo Park, California. When correct domains have been selected which are especially effective in modulating or competing defined functions, a more detailed analysis, to the level of the β- strand segments might be addressed. Various chimeric, deletion, insertion, or substitution constructs of each β- strand or inter-strand segment may be generated and tested, as described above. Each construct could be produced using methods of standard genetic engineering, especially using synthetic primers. Procedures for using such reagents are described, e.g., in Sambrook, et al. (1989) Molecular Cloning: A Laboratory Manual, vols. 1-3, Cold Spring Harbor Press, and Ausubel et al. (eds.) (1989) Current Protocols in Molecular Biology. Wiley, each of which is hereby incorporated herein by reference. B. Soluble Forms In some embodiments, only the extracellular region is provided. Thus, the extracellular region alone, without the transmembrane segment, will often be a soluble polypeptide. It has been demonstrated that the entire extracellular region, separated from, and which lacks a transmembrane region and an intracellular region, still serves as a ligand binding polypeptide. In particular, the soluble polypeptide D1-D2-D3- D4-D5 has been demonstrated to bind various PDGF forms. Although the binding specificity for the PDGF form is dependent, to some extent, on the specific domains included, modifications to the specificity of the ligand binding may be effected by either substituting various different domains or rearranging the domains. Substitution with other homologous segments may also be performed, e.g., substituting an Ig-like domain from an antibody molecule, such as an antibody which binds a platelet-derived growth factor. Alternatively, a domain from a different related growth factor or ligand receptor may be substituted, e.g., from an FGF receptor or another PDGF receptor. The order of the domains may also be modified, e.g., D5-D4-D3-D2-D1. In particular, the activities which will usually be of greatest importance with the extracellular constructs relate to the binding of the ligand. For example, it has been discovered that domains D4 and D5 are not essential for ligand binding of a soluble extracellular region PDGF-R polypeptide. Of the remaining domains, if domain D3 is separated from domains Dl and D2, the construct D1-D2 binds the ligand only at low affinity, but a D1-D2-D3 construct binds ligand at high affinity. A typical hPDGF-R nucleic acid sequence encodes a transitory amino terminal hydrophobic sequence, which is usually cleaved during the membrane translocation process. The classical function of a signal sequence is to direct the nascent polypeptide chain to membrane bound ribosomes, thereby leading to membrane translocation or cellular targeting. However, since the signal sequence is typically removed in the translocation process, the signal sequence is usually absent in a mature polypeptide. Often a signal sequence will be attached upstream of a desired soluble peptide of this invention. Solubility of a polypeptide depends upon the environment and the polypeptide. Many parameters affect polypeptide solubility, including the temperature, the electrolyte environment, the size and molecular characteristics of the polypeptide, and the nature of the solvent. Typically, the temperature at which the polypeptide is used ranges from about 4*C to about 65*C. Usually the temperature at use is greater than about 18'C and more usually greater than about 22*C. For diagnostic purposes, the temperature will usually be about room temperature or warmer, but less than the denaturation temperature of components in the assay. For therapeutic purposes, the temperature will usually be body temperature, typically about 37*C for humans, though under certain situations the temperature may be raised or lowered in situ or in vitro. The electrolytes will usually approximate in situ physiological conditions, but may be modified to higher or lower ionic strength where advantageous. The actual ions may be modified to conform to standard buffers used in physiological or analytical contexts. The size and structure of the polypeptide should be in a substantially stable and globular state, and usually not in a denatured state. The polypeptide may be associated with other polypeptides in a quaternary structure, e.g., to confer solubility. The solvent will usually be a biologically compatible buffer, of a type used for preservation of biological activities, and will usually approximate a physiological solvent. On some occasions, a detergent will be added, typically a mild non-denaturing one. Solubility is usually measured in Svedberg units, which are a measure of the sedimentation velocity of a molecule under particular conditions. The determination of the sedimentation velocity was classically performed in an analytical ultracentrifuge, but is typically now performed in a standard ultracentrifuge. See, Freifelder (1982) Physical Biochemistry (2d ed.), W.H. Freeman, and Cantor and Schimmel (1980) Biophysical Chemistry, parts 1-3, W.H. Freeman & Co., San Francisco, each of which is hereby incorporated herein by reference. As a crude determination, a sample containing a "soluble" polypeptide is spun in a standard full sized ultracentrifuge at about 5OK rpm for about 10 minutes, and soluble molecules will remain in the supernatant. A soluble particle or polypeptide will typically be less than about 3OS, more typically less than about 15S, usually less than about 10S, more usually less than about 6S, and, in particular embodiments, preferably less than about 4S, and more preferably less than about 3S. This invention provides platelet-derived growth factor polypeptides and proteins having platelet-derived growth factor receptor ligand binding activity. The receptors of the present invention include PDGF receptor amino acid sequences such as those shown in Tables 6, 7, 8, 9, and 10. Also provided are homologous sequences, allelic variations, induced mutants, alternatively expressed variants, and proteins encoded by DNA which hybridize under high stringency conditions to PDGF receptor encoding nucleic acids retrieved from naturally occurring material. The platelet-derived growth factor receptor peptides of the present invention will exhibit at least about 80% homology with naturally occurring domains of hPDGF receptor sequences in the domains Dl, D2, D3, D4, and D5, typically at least about 85% homology with a natural form of a receptor sequence, more typically at least about 90% homology, usually at least about 95% homology, and more usually at least about 97% homology. Homology, for polypeptides, is typically measured using sequence analysis software, see, e.g., Sequence Analysis Software Package of the Genetics Computer Group, University of Wisconsin Biotechnology Center, 1710 University Avenue, Madison, Wisconsin 53705. Protein analysis software matches similar sequences using measure of homology assigned to various substitutions, deletions, substitutions, and other modifications. Similar, or homologous, substitutions for LBR segments will be made in known sequences, thereby producing new binding molecules having modified affinity or specificity of ligand binding. Various other software analysis programs can analyze the conformational structure of a polypeptide. Homologous conformation may also be achieved by appropriate insertion, deletion, substitution, or modification of amino acid sequences. Since the conformational structure of the domains and /9-strand segments is only partially understood, the present invention also encompasses various modifications to the sequences disclosed and retaining these structural features. In particular, ligand binding function is believed to be localized to the extracellular domain, particularly the LBR's, and the soluble forms will preferably retain this particular function. Soluble fragments of PDGF receptors will be useful in substituting for or for interfering with, e.g., blocking, by competing for PDGF binding, the functions of the natural receptor both in vitro and in vivo. Alternatively, soluble forms may interfere with the dimerization of PDGF receptor polypeptides, since the proteins may normally be in, or function in, a dimer form. Receptor dimerization may be essential for proper physiological signal transduction, and introduction of fragments may function to interrupt these processes by blocking their dimerization. PDGF receptor polypeptides may be purified using techniques of classical protein chemistry, see, e.g., Deutscher (ed.) (1990) Guide to Purification: Methods in Enzymology, Vol. 182, which is hereby incorporated herein by reference. Alternatively, a lectin affinity chromatography step may be used, or a highly specific ligand affinity chromatography procedure, e.g., one that utilizes a PDGF conjugated to biotin through cysteine residues of the protein mitogen. Purified PDGF receptor polypeptides may also be obtained by a method such as PDGF affinity chromatography using activated CH- Sepharose coupled to PDGF through primary amino groups as described in I amura et al. (1988) Biochem. Biophys. Res. Depending on the availability of specific antibodies, specific PDGF receptor peptide constructs may also be purified using immuno-affinity chromatography. Antibodies prepared, as described below, may be immobilized to an inert substance to generate a highly specific immuno-affinity column. See, e.g., Harlow and Lane (1990) Monoclonal Antibodies: A Laboratory Manual. Cold Spring Harbor Laboratory, which is hereby incorporated herein by reference. Various cells or tissues may be selected as starting materials, usually selected on the basis of abundant expression of the desired receptor construct or polypeptide. High expression promoter sequences may be operably linked to a recombinant sequence, preferably an inducible promoter. The promoter is operably linked when it operates to promote the sequence. Appropriate cells that contain relatively large amounts of the receptor protein, as determined by high affinity binding of PDGF, can be transformed with variants of the PDGF receptor polypeptides. These may be used to replace the natural form of PDGF receptor by a construct with a deletion or insertion. The ligand binding regions (LBR's) or other segments may be "swapped" between different new fusion constructs or fragments. Thus, new chimeric polypeptides exhibiting new combinations of segments can result from the structural linkage of different functional domains. Ligand binding regions which confer desired or modified specificities may be combined with other domains which have another function, e.g., each Ig-like domain could be substituted by a similar domain from other related polypeptides, or LBR's between different alleles or similar receptors may be combined. The present invention also provides for fusion polypeptides between the receptor polypeptide domains and other homologous or heterologous proteins. Homologous proteins may be fusions between similar but different growth factor receptors resulting in, e.g., a hybrid protein exhibiting ligand specificity of one receptor with an intracellular domain of another, or a receptor which may have altered affinity or a broadened or narrowed specificity of binding. Likewise, heterologous fusions may be constructed which exhibit a combination of properties or activities of the derivative proteins. Typical examples are fusions of a reporter polypeptide, e.g., luciferase, with a domain of a receptor, e.g., a ligand binding domain from the extracellular region of a human platelet-derived growth factor receptor, so that the presence or location of a desired ligand may be easily determined. See, e.g., Dull et al., U.S. Patent No. 4,859,609, which is hereby incorporated herein by reference, other gene fusion partners include bacterial /3-galactosidase, trpE, protein A, /3-lactamase, α-amylase, alcohol dehydrogenase, and yeast α-mating factor. See, e.g., Godowski et al., (1988) Science 241: 812-816. Additional sequences with various defined functions may be found by searching through the GenBank™ (National Institutes of Health) sequence data bank. A heterologous fusion protein is one which includes sequences not naturally found in conjunction with one another. Thus, a heterologous fusion protein may be a fusion of two similar, and homologous, sequences. Fusion proteins would typically be made by either recombinant nucleic acid methods with expression, or by synthetic polypeptide methods. Techniques for nucleic acid manipulation are described generally, for example, in Sambrook et al. (1989) Molecular Cloning: A Laboratory Manual (2nd ed.) volumes 1-3, Cold Spring Harbor Laboratory, which is hereby incorporated herein by reference. Techniques for synthesis of polypeptides are described, for example in Merrifield (1963) J. Amer. Chem. Soc. 85:2149-2456; Atherton et al. (1989) Solid Phase Peptide Synthesis: A Practical Approach. IRL Press, Oxford; and Merrifield (1986) Science 232:341-347; each of which is hereby incorporated herein by reference. The recombinant nucleic acid sequences used to produce fusion proteins of the present invention may be derived from natural or synthetic sequences. Many natural gene sequences are available from various cDNA or from genomic libraries using appropriate probes, see, e.g., GenBank™, National Institutes of Health. Typical probes for isolating platelet-derived growth factor receptor genes may be selected from sequences of Tables 1 and 2, in accordance with standard procedures. Suitable synthetic DNA fragments may be prepared, e.g., by the phosphoramidite method described by Beaucage and Carruthers (1981) Tetra. Letts. 22:1859-1862. A double stranded fragment may then be obtained by either synthesizing the complementary strand and hybridizing the strands together under appropriate conditions or by adding the complementary strand using DNA poly erase with an appropriate primer sequence. III. Nucleic Acids The present invention provides nucleic acid sequences encoding various PDGF receptor sequences described above. Tables 1 and 2, respectively set forth the corresponding cDNA sequences encoding human type B and type A PDGF receptor polypeptides. Substantial homology in the nucleic acid context means either that the segments, or their complementary strands, when compared, are the same when properly aligned, with appropriate nucleotide insertions or deletions, in at least about 60% of the residues, typically at least about 70%, more typically at least about 80%, usually at least about 90%, and more usually at least about 95 to 98% of the nucleotides. Appropriate nucleotide insertions or deletions include interdomain sequences, or those external to the cysteines within a domain, but the sequences within the paired cysteines (or their equivalents in the D4 domains) will often be very important to retain. Structural homology will exist when there is at least about 55% homology over a stretch of at least about 14 nucleotides, typically at least about 65%, more typically at least about 75%, usually at least about 90%, and more usually at least about 95% or more. Alternatively, substantial homology exists when the segments will hybridize under selective hybridization conditions, to a strand, or its complement, typically using a sequence of at least about 20 contiguous nucleotides derived from Table 1 or 2. However, larger segments would usually be preferred, e.g., at least about 30 contiguous nucleotides, more usually at least about 40, and preferably more than about 50. Selectivity of hybridization exists when hybridization occurs which is more selective than total lack of specificity. See. Kanehisa (1984) Nucleic Acids Res. 12:203-213, which is incorporated herein by reference. Stringent hybridization conditions will normally include salt concentrations of less than about 1 M, typically less than about 700 mM, more typically less than about 500 mM, usually less than about 400 mM, more usually less than about 300 mM, and preferably less than about 200 mM. Temperature conditions will typically be greater than about 20"C, more typically greater than about 25*C, usually greater than about 30"C, more usually greater than about 37°C, and preferably in excess of about 40*C, depending upon the particular application. As other factors may significantly affect the stringency of hybridization, including, among others, base composition and size of the complementary strands, presence of organic solvents, and extent of base mismatching, the combination of parameters is more important than the absolute measure of any one. Probes may be prepared based on the sequence of the PDGF receptor encoding sequences provided in Tables 1 and 2. The probes may be used to isolate other PDGF receptor nucleic acid sequences by standard methods. See, e.g., Sambrook et al. (1989) Molecular Cloning: A Laboratory Manual, vols. 1-3, CSH Press, N.Y., which is hereby incorporated herein by reference. Other similar nucleic acids may be selected for by using homologous nucleic acids. Alternatively, nucleic acids encoding these same or similar receptor polypeptides may be synthesized or selected by making use of the redundancy in the genetic code. Various codon substitutions may be introduced, e.g. , silent changes thereby providing various convenient restriction sites, or to optimize expression for a particular system, e.g. , to match the optimum codon usage. Mutations may be introduced to modify the properties of the receptors, perhaps to change the ligand binding affinities, the inter¬ chain affinities, or the polypeptide degradation or turnover rate. The DNA compositions of this invention may be derived from genomic DNA or cDNA, prepared by synthesis or may be a hybrid of the various combinations. Recombinant nucleic acids comprising sequences otherwise not naturally occurring in continuity are also provided by this invention. An isolated DNA sequence includes any sequence that has been obtained by primer or hybridization reactions or subjected to treatment with restriction enzymes or the like. Synthetic oligonucleotides can be formulated by the triester method according to Matteucci et al. (1981) J. Am. Chem. Soc. 103:3185 or by other methods such as commercial automated oligonucleotide synthesizers. Oligonucleotides can be labeled by excess polynucleotide kinase (e.g., about 10 units to 0.1 nanomole substrate is used in connection with 50 mM Tris, pH 7.6, 5 mM dithiothreitol, 10 mM MgCl 2 , 1-2 mM ATP, 1.7 pmoles 32 P-ATP (2.9 mCi/mmole) 0.1 mM spermidine, 0.1 mM EDTA) . Probes may also be prepared by nick translation, Klenow fill-in reaction, or other methods known in the art. See, e.g., Sambrook et al. cDNA or genomic libraries of various types may be screened for new alleles or related sequences. The choice of cDNA libraries normally corresponds to a tissue source which is abundant in mRNA for the desired receptors. Phage libraries are normally preferred, but plasmid libraries may also be used. Clones of a library are spread onto plates, transferred to a substrate for screening, denatured, and probed for the presence of desired sequences. For example, with a plaque hybridization procedure, each plate containing bacteriophage plaques is replicated onto duplicate nitrocellulose filter papers (Millipore-HATF) . The phage DNA is denatured with a buffer such as 500 mM NaOH, 1.5 M NaCl for about 1 minute, and neutralized with, e.g., 0.5 M Tris-HCl, pH 7.5, 1.5 M NaCl (3 times for 10 minutes each). The filters are then washed. After drying, the filters are typically baked, e.g., for 2 hours at 80'C in a vacuum oven. The duplicate filters are prehybridized at 42'C for 4-24 hours with 10 ml per filter of DNA hybridization buffer (20-50% formamide, 5X SSC, pH 7.0, 5X Denhardt's solution (polyvinylpyrrolidone, plus Ficoll and bovine serum albumin; IX **** 0.02% of each), 50 mM sodium phosphate buffer at pH 7.0, 0.2% SDS, and 50 μg/ml denatured salmon sperm DNA) . Hybridization with an appropriate probe may be performed at 42*C for 16 hrs with 10 ml/filter of 1 x 10 6 σpm/ml of DNA hybridization buffer containing radioactively labeled probe. The final concentration of formamide is varied according to the length of the probe and the degree of stringency desired. See, e.g., Wetmur and Davidson (1968) J. Mol. Biol. 31:349-370; and M. Kanehisa (1984) Nuc. Acids Res. 12:203-213, each of which is incorporated herein by reference, for a discussion of hybridization conditions and sequence homology. An oligonucleotide probe based on the disclosed amino acid sequences may be used to site specifically mutate or generate recombinant fusion or deletion constructs. See, e.g., Tables 11 and 12 for preferred oligonucleotide reagents. Procedures such as those described by Kimbel et al. (1987) Methods in Enzvmology 154:367, may be used. The sequences PΔ1 through PΔ9 correspond to Seq. ID No. 6 through 14, respectively, and sequences PΔ101 through PΔ109 correspond to Seq. ID No. 15 through 23, respectively. TABLE 11 HUMAN B-type PDGF-R MUTAGENESIS O IGOHERS Domain 5 / 3 'NonCoding PΔ1 5' CCA CAC TCC TTG CCC TTT AAG / TAGCTTCCTGTAGGGGGCTG P H S L P F K / * ********** Domain 4 / 3 -NonCoding PΔ2 TCC TTC GAC CTA CAG ATC AAT / TAGCTTCCTGTAGGGGGCTG S F Q L Q I N / * ********** Domain 3 / 3 'NonCoding PΔ3 ATC ACC GTG GTT GAG AGC GGC / TAGCTTCCTGTAGGGGGCTG I T V V E S G / * ********** Domain 2 / 3 'NonCoding PΔ4 TAC AGA CTC CAG GTG TCA TCC / TAGCTTCCTGTAGGGGGCTG ' 3 ' Y L Q V S S / * ********** Domain 1 / 3 'NonCoding PΔ5 5' CTC TAC ATC TTT GTG CCA GAT CCC / TAGCTTCCTGTAGGGGGCTG 3' L Y I F V P D P / * ******** Signal Sequence : Domain 1 / Domain 2 PΔ6 5' CAG ATC TCT CAG GGC: CTG GTC / ACC GTG GGC TTC CTC CCT AAT CAT 3' Q I S Q G . L V / T V G F L P N D Signal Sequence : Domain 1 / Domain 3 PΔ7 5* CAG ATC TCT CAG GGC: CTG GTC/ATC AAC GTC TCT GTG AAC GCA GTG CAG3 ' Q I S Q G : L V / I N V S V N A V Q Signal Sequence : Domain 1 / Domain 4 PΔ8 5' CAG ATC TCT CAG GGC: CTG GTC / TAC GTG CGG CTC CTG GGA GAG CTG Q I S Q G . L V / Y V R L L G E V Signal Sequence Domain 1 / Domain 5 PΔ9 5' CAG ATC TCT CAG GGC CTG GTC / GTC CGA GTG CTG GAG CTA AGT 3' Q I S Q G L V / V R V W L A TABLE 12 PROPOSED HUMAN A-type PDGF-R MUTAGENESIS OLIGOMERS Domain 5 / 3 • NonCoding PΔ101 5' GCT CCC ACC CTG CGT TCT GAA / TAACTGGCGGATTCGAGGGG A P T L R S E / * ********** Domain 4 / 3 ' NonCoding PΔ10. 5 1 GAA CTG TTA ACT CAA GTT CCT / TAACTGGCGGATTCGAGGGG E L L T Q V P / * ********** Domain 3 / 3 ' onCoding PΔ103 5' ATT TCT GTC CAT GAG AAA GGT / TAACTGGCGGATTCGAGGGG I S V H E K G / * ********** Domain 2 / 3 'NonCoding PΔ104 5' TAT GCT TTA AAA GCA ACA TCA / TAACTGGCGGATTCGAGGGG Y A K A T S / * ********** Domain 1 / 3 • onCoding PΔ105 5' ATT TAC ATC TAT GTG CCA GAC CCA / TAACTGGCGGATTCGAGGGG 3' I Y I Y V P D P / * ********** Signal Sequence : Domain l / Domain 2 PΔ106 5' AGC CTA ATC CTC TGC CAG CTT / GAT GTA GCC TTT GTA CCT CTA GGA 3' S L I C . Q / D V A F V P L G Signal Sequence : Domain 1 / Domain 3 PΔ107 5' AGC CTA ATC CTC TGC CAG CTT/GAG CTG GAT CTA GAA ATG GAA GCT CTT 3' S L I C : Q L / E L D L E M E A L Signal Sequence : Domain 1 / Domain 4 PΔ108 5' AGC CTA ATC CTC TGC CAG CTT / TTC ATT GAA ATC AAA CCC ACC TTC 3' S L I L C . Q L / F I E I K P T F Signal Sequence : Domain 1 / Domain 5 PΔ109 5' AGC CTA ATC CTC TGC CAG CTT / TCA TCC ATT CTG GAC TTG GTC 3' S L I L C . Q L / S S I L D L V In accordance with this invention any isolated DNA sequence which encodes substantially a PDGF-R complete structural sequence can be used as a probe. Alternatively, any DNA sequence that encodes a PDGF-R hydrophobic signal sequence and its translational start site may be used. An isolated partial DNA sequence which substantially encodes intact domains exhibiting PDGF-R activity (e.g., ligand or PDGF-R binding) is also part of this invention. Preferred probes are cDNA clones of PDGF receptor polypeptides. The DNA sequences used in this invention will usually comprise intact domain structures, typically at least about 5 codons (15 nucleotides) , more typically at least about 9 codons, usually at least about 13 codons, more usually at least about 18 codons, preferably at least about 25 codons and more preferably at least about 35 codons. One or more introns may also be present. This number of nucleotides is usually about the minimal length required for a successful probe that would hybridize specifically with a PDGF receptor sequence. For example, epitopes characteristic of a PDGF-R may be encoded in short peptides. Usually the wild-type sequence will be employed, in some instances one or more mutations may be introduced, such as deletions, substitutions, insertions, or inversions. These modifications may result in changes in the amino acid sequence, provide silent mutations, modify a restriction site, or provide specific mutations. The genomic sequence will usually not exceed about 200 kb, more usually not exceed about 100 kb, preferably not greater than about 0.5 kb. Portions of the DNA sequence having at least about 10 nucleotides from a DNA sequence encoding an PDGF receptor peptide will typically be used, more typically at least about 15 nucleotides, usually at least about 20 nucleotides, more usually at least about 25 nucleotides, and preferably at least about 30 nucleotides. The probes will typically be less than about 6 kb, usually fewer than about 3.0 kb, and preferably less than about 1 kb. The probes may also be used to determine whether mRNA encoding a specific PDGF-R is present in a cell or different tissues. The natural or synthetic DNA fragments coding for a desired platelet-derived growth factor receptor fragment will usually be incorporated into DNA constructs capable of introduction to and expression in an in vitro cell culture. Often the DNA constructs will be suitable for replication in a unicellular host, such as yeast or bacteria, but may also be intended for introduction to, with and without integration within the genome, cultured mammalian, or plant or other eukaryotic cell lines. Human cells may be preferred hosts. Higher eukaryote host cells will often be preferred because their glycosylation and protein processing patterns more likely simulate human processing. DNA constructs prepared for introduction into bacteria or yeast will typically include a replication system recognized by the host, the intended DNA fragment encoding the desired receptor polypeptide construct, transcriptional and translational initiation regulatory sequences operably linked to the polypeptide encoding segment, and transcriptional and translational termination regulatory sequences operably linked to the polypeptide encoding segment. The transcriptional regulatory sequences will typically include a heterologous enhancer or promoter which is recognized by the host. The selection of an appropriate promoter will depend upon the host, but promoters such as the trp, lac, and phage promoters, tRNA promoters, and glycolytic enzyme promoters are known and available. See, e.g., Sambrook et al. (1989). Conveniently available expression vectors which include the replication system and transcriptional and translational regulatory sequences together with the insertion site for the platelet-derived growth factor receptor DNA sequence may be employed. Examples of workable combinations of cell lines and expression vectors are described, e.g., in Sambrook et al. (1989); see also. Metzger et al. (1988) Nature 334:31-36. Expression vectors for these cells can include expression control sequences, such as an origin of replication, a promoter, an enhancer and necessary processing information sites, e.g., ribosome-binding sites, RNA splice sites, polyadenylation sites, and transcriptional terminator sequences. Preferably, the enhancers or promoters will be those naturally associated with genes encoding the PDGF receptor polypeptides, although it will be understood that in many cases others will be equally or more appropriate. Other preferred expression control sequences are enhancers or promoters derived from viruses, such as SV40, Adenovirus, Bovine Papilloma Virus, and the like. Similarly, preferred promoters are those found naturally in immunoglobulin-producing cells, see, e.g., U.S. Patent No. 4,663,281, which is incorporated herein by reference, but SV40, polyoma virus, cytomegalovirus (human or murine) and the LTR from various retroviruses, e.g., murine leukemia virus, murine or Rous sarcoma virus and HIV, may be utilized, as well as promoters endogenous to PDGF-R genes. See. Enhancers and Eukaryotic Gene Expression. (1983) Cold Spring Harbor Press, N.Y., which is incorporated herein by reference. The vectors containing the DNA segments of interest, e.g., a PDGF receptor polypeptide gene or cDNA sequence, can be transferred into the host cell by well-known methods, which vary depending on the type of cellular host. For example, calcium chloride transfection is commonly utilized for prokaryotic cells, whereas calcium phosphate treatment may be used for other cellular hosts. See generally, Sambrook et al. (1989) Molecular Cloning: A Laboratory Manual (2d ed.) CSH Press, which is incorporated herein by reference. The term "transformed cell" is meant to also include the progeny of a transformed cell. As with the purified polypeptides, the nucleic acid segments associated with the ligand-binding segment, the extracellular domain and the intracellular domain are particularly useful. These gene segments will be used as probes for screening for new genes exhibiting similar biological activities, though the controlling elements of these genes may also be of importance. IV. Methods for Making PDGF Receptor Polypeptide Constructs DNA sequences may also be used to express PDGF-R polypeptides. For example, a DNA sequence of from about 21 nucleotides (encoding about 7 amino acids) to about 2.1 kb- (about 700 amino acids) may be used to express a polypeptide having a PDGF receptor specific activity, typically ligand-binding. In particular, constructs retaining the ligand binding regions will be useful, as these constructs will possess binding activity. In particular, various synthetic linkers and probes may be constructed to facilitate genetic engineering of the PDGF-R nucleic acid sequences. Polymerase chain reaction (PCR) techniques can be applied to producing large quantities of fragments or segments useful in the proper manipulation of the sequences encoding the constructs. See, e.g., Innis et al. (1990) PCR Protocols. Academic Press. Alternatively, nucleic acid synthesizers can produce sufficiently large quantities of fragments for hybridizing to any preselected sequence, e.g. , from Table 1 or 2, or for manipulating the sequence to add or delete specific domains or segments. Particularly important segments will be the LBR's. Large quantities of the receptor proteins may be prepared by expressing the whole receptor or parts of the receptor contained in the expression vehicles in compatible hosts such as E. coli. yeast, mammalian cells, insect cells, or frog oocytes. The expression vehicles may be introduced into the cells using methods well known in the art such as calcium phosphate precipitation (discussed below) , lipofectin electroporation, or DEAE dextran transformation. Usually the mammalian cell hosts will be immortalized cell lines. To study the characteristics of a PDGF-R and its corresponding ligand, it will be useful to transfect, or transform mammalian cells which lack or have low levels of a PDGF receptor. Preferably, a signal sequence can serve to direct the peptide to the cell membrane or for secretion. Cells lacking significant amounts of PDGF receptors include Chinese hamster ovary (CHO) cells, most epithelial cell lines, and various human tumor cell lines. Transformed or transfected cells can be selected which incorporate a DNA sequence which encodes a receptor that is functionally equivalent to a wild-type receptor thereby conferring a PDGF-sensitive mitogenic response. Such cells will enable the analysis of the binding properties of various added PDGF receptor polypeptides. Transfected cells may also be used to evaluate the effectiveness of a composition or drug as a PDGF antagonist or agonist. The level of receptor tyrosine kinase activity or the rate of nucleic acid synthesis can be determined by contacting transfected cells with drugs or ligands and comparing the effects of various ligand analogues against the controls. Although the most common procaryote cells used as hosts are strains of E. coli. other prokaryotes such as Bacillus subtilis or Pseudomonas may also be used. The DNA sequences of the present invention, including fragments or portions of the sequence encoding for receptor polypeptides comprising intact structural domains, a portion of the receptor, or a polypeptide having an PDGF-R activity, can be used to prepare an expression vehicle or construct for a PDGF-R polypeptide or polypeptide having a PDGF-R activity. Usually the control sequence will be a eukaryotic promoter for expression in a mammalian cell. In some vehicles the receptor's own control sequences may also be used. A common prokaryotic plasmid vector for transforming E. coli is pBR322 or its derivatives, e.g. the plasmid pkt279 (Clontech) , see Bolavar et al. (1977) Gene. 2:95. The prokaryotic vectors may also contain prokaryotic promoters for transcription initiation, optionally with an operator. Examples of most commonly used prokaryotic promoters include the beta-lactamase (penicillinase) ; lactose (lac) promoter, see Cheng et al. (1977) Nature, 198:1056; tryptophan promoter (trp), see Goeddell et al. (1980) Nucleic Acid Res.. 8: 457) ; P L promoter; and the N-gene ribosome binding site, see Shimatake et al. (1981) Nature, 292:128-; each of which is hereby incorporated herein by reference. Promoters used in conjunction with yeast can be promoters derived from the enolase gene, see Holland et al. (1981) J. Biol. Chem.. 256:1385 ; or the promoter for the synthesis of glycolytic enzymes such as 3-phosphoglycerate kinase, see Hitzeman et al. (1980) J. Biol. Chem. , 255:. Appropriate non-native mammalian promoters will include the early and late promoters from SV40, see Fiers et al. (1978) Nature, 273:113; or promoters derived from murine muloney leukemia virus, mouse mammary tumor virus, avian sarcoma viruses, adenovirus II, bovine papilloma virus, or polyoma. In addition, the construct may be joined to an amplifiable gene, e.g. dihydrofolate reductase (DHFR) so that multiple copies of the PDGF receptor gene may be made. See, e.g., Kaufman et al. (1985) Mol. and Cell. Biol. 5:1750-1759; and Levinson et al. EPO publication nos. 0117059 and 0117060, each of which is incorporated hereby by reference. Prokaryotes may be transformed by various methods, including using CaCl , see Cohen (1972) Proc. Nat'l Acad. Sci. USA. 69:2110; or the RbCl method, see Maniatis et al. (1982) Molecular Cloning: A Laboratory Manual. Cold Spring Harbor Press. Yeast may be transformed, e.g., using a method described by Van Solingen et al. (1977) J. Bacteriol. 130:946; or Hsiao et al. (1979) Proc. Nat'l Acad. Sci. USA 76:3829. With respect to eukaryotes, mammalian cells may be transfected using a calcium phosphate precipitation method, see, e.g. , Graham and van der Eb (1978) Virology. 52:546; or by lipofectin (BRL) or retroviral infection, see, e.g., Gilboa (1983) Experimental Manipulation of Gene Expression. Chap. 9, Academic Press P. 175. The actual expression vectors containing appropriate sequences may be prepared according to standard techniques involving ligation and restriction enzymes. See e.g., Maniatis supra. Commercially available restriction enzymes for cleaving specific sites of DNA may be obtained from New England BioLabs, Beverly, Massachusetts. Particular cotransformations with other genes may be particularly useful. For example, it may be desired to co- express the nucleic acid with another processing enzyme. Such enzymes include signal peptidase, tertiary conformation conferring enzymes, or glycosylating enzymes. This expression method may provide processing functions which otherwise might be lacking in the expression host, e.g., mammalian-like glycosylation in a prokaryote expression system. Alternatively, the host cell selected for expression may be chosen on the basis of the natural expression of those processing enzymes. Cell clones are selected by using markers depending on the mode of the vector construction. The marker may be on the same or a different DNA molecule preferably the same DNA molecule. With mammalian cells the receptor gene itself may be the best marker. In prokaryotic hosts the transformant may be selected by resistance to ampicillin, tetracycline, or other antibiotics. Production of a particular product based on temperature sensitivity or compensation may serve as appropriate markers. Various methods may be used to harvest and purify the PDGF-R receptor protein or peptide fragment. The peptide may be isolated from a lysate of the host. The peptide may be isolated from the cell supernatant if the peptide is secreted. The PDGF-R peptide is then further purified as discussed above using HPLC, electrophoresis, or affinity chromatography, e.g. , immuno-affinity or ligand affinity. Another method which can be used to isolate cDNA clones of PDGF-R related species involves the use of the polymerase chain reaction (PCR). See, e.g., Saiki et al. (1985) Science 230:1350. In this approach two oligonucleotides corresponding to distinct regions of the PDGF-R sequence are synthesized and then used in the PCR reaction, typically to amplify receptor-related mRNA transcripts from an mRNA source. Annealing of the oligonucleotides and PCR reactions are performed under conditions of reduced stringency. The resulting amplified fragments are subcloned, and the resulting recombinant colonies are probed with 32 P-labeled full-length PDGF-R cDNA. Clones which hybridize under low but not high stringency conditions represent PDGF-R related mRNA transcripts. This approach can also be used to isolate variant PDGF-R cDNA species which arise as a result of alternative splicing, see Frohman et al. (1988) Proc. Nat'l Acad. Sci. USA. 85:8998. V. Antibodies Polyclonal and/or monoclonal antibodies to the various PDGF receptor constructs, receptor peptides, and peptide fragments may also be prepared. Peptide fragments may be prepared synthetically in a peptide synthesizer and coupled to a carrier molecule (i.e., keyhole limpet hemocyanin) and injected into rabbits over several months. The rabbit sera is tested for immunoreactivity to the PDGF receptor protein or fragment. Monoclonal antibodies may be made by injecting mice with PDGF-R protein, PDGF-R polypeptides, or mouse cells expressing high levels of the cloned PDGF receptor on its cell surface. Monoclonal antibodies will be screened by ELISA and tested for specific immunoreactivity with the PDGF receptor protein or polypeptides thereof. See, Harlow and Lane (1988) Antibodies: A Laboratory Manual. CSHarbor Press, which is hereby incorporated herein by reference. These antibodies will be useful in assays as well as pharmaceuticals. Once a sufficient quantity of the desired PDGF receptor polypeptide construct has been obtained, the protein may be used for various purposes. A typical use is the production of antibodies specific for binding to epitopes characteristic of these receptors. These antibodies may be either polyclonal or monoclonal and may be produced by in vitro or in vivo techniques. For production of polyclonal antibodies, an appropriate target immune system is selected, typically a mouse or rabbit. The substantially purified antigen is presented to the immune system in a fashion determined by methods appropriate for the animal and other parameters well known to immunologists. Typical sites for injection are in the footpads, intramuscularly, intraperitoneally, or intradermally. Of course, another species may be substituted for a mouse or rabbit, typically a mammal, but possibly a bird or other animal. An immunological response is usually assayed with an immunoassay. Normally such immunoassays involve some purification of a source of antigen, for example, produced by the same cells and in the same fashion as the antigen was produced. The immunoassay may be a radioimmunoassay, an enzyme-linked assay (ELISA) , a fluorescent assay, or any of many other choices, most of which are functionally equivalent but may exhibit particular advantages under specific conditions. Monoclonal antibodies with affinities of at least about 10 6 M "1 preferably 10 8 ' 10 10 , or higher will be made by standard procedures as described, e.g. , in Harlow and Lane, (1988) Antibodies: A Laboratory Manual. CSH Press; or Goding, (1986) Monoclonal Antibodies: Principles and Practice (2d ed) Academic Press, New York, which are hereby incorporated herein by reference. Briefly, appropriate animals will be selected and the desired immunization protocol followed. After the appropriate period of time, the spleens of such animals are excised and individual spleen cells fused, typically, to immortalized myeloma cells under appropriate selection conditions. Thereafter the cells are clonally separated and the supernatants of each clone are tested for their production of an appropriate antibody specific for the desired region of the antigen. Other suitable techniques involve in vitro exposure of lymphocytes to the antigenic polypeptides or alternatively to selection of libraries of antibodies in phage or similar vectors. See. Huse et al. "Generation of a Large Combinatorial Library of the Immunoglobulin Repertoire in Phage Lambda," Science 246:1275-1281 (1989), hereby incorporated herein by reference. The polypeptides and antibodies of the present invention may be used with or without modification. Frequently, the polypeptides and antibodies will be labeled by joining, either covalently or non-covalently, a substance which provides for a detectable signal. A wide variety of labels and conjugation techniques are known and are reported extensively in both the scientific and patent literature. Suitable labels include radionuclides, enzymes, substrates, cofactors, inhibitors, fluorescens, chemiluminescers, magnetic particles and the like. Patents, teaching the use of such labels include U.S. Patent Nos. 3,817,837; 3,850,752; 3,939,350; 3,996,345; 4,277,437; 4,275,149; and 4,366,241. Also, recombinant immunoglobulins may be produced, see Cabilly, U.S. Patent No. 4,816,567. Antibodies of particular interest are those raised against the ligand binding regions. These will include some antibodies which function as ligands. Or, antibodies may be used to select for compounds which could serve as ligands for modified receptors. See, e.g., Meyer (1990) Nature 347:424- 425; and Pain et al. (1990) Nature 347:444-447; each of which is hereby incorporated herein by reference. VIII. Methods for Use The present invention provides platelet-derived growth factor receptor (PDGF-R) polypeptide purification methods as well as methods for synthesizing PDGF receptors within cells. Also provided are homogeneous receptors produced by these methods, nucleic acid sequences encoding the receptors or portions of the receptors, as well as expression vehicles containing these sequences, cells comprising the PDGF- receptors, and antibodies to the' receptors. In particular, the present invention provides methods for assaying binding and other activities of receptor-like proteins having rearranged combinations of the domains. The extracellular region of the human type B PDGF receptor protein has been used to successfully bind PDGF BB ligand in a receptor activation assay. PDGF BB ligand binding to NIH3T3 cell-associated PDGF receptors is measured. Ligand binding causes phosphorylation (activation) of the cell associated receptors. Receptor phosphorylation is followed in a multi-step process which first involves solubilization of NIH3T3 cells and separation of cell proteins by electrophoresis of cell extracts on sodium dodecyl sulfate polyacrylamide gels. Gels are blotted onto nitrocellulose and treated with anti- phosphotyrosine monoclonal antibodies to aid in the detection of phosphorylated PDGF receptor. Monoclonal antibodies are visualized through autoradiography of antibody-associated 125-1 protein A which has been introduced at the terminal stage of the assay. If human type B receptor protein (at about a 60 fold molar excess to PDGF BB ligand) is preincubated with ligand for 1 hour prior to incubation with NIH3T3 cells, there is no cell- associated PDGF receptor phosphorylation. This indicates that the human type B PDGF receptor protein binds PDGF BB ligand in solution and prevents the ligand from activating cell- associated PDGF receptors. Thus, polypeptides which contain LBR's may be used to block normal PDGF responses. The domain containing structures of the present invention will find use both as diagnostic and therapeutic reagents. The receptor polypeptides may be used as affinity reagents for detecting or binding ligand, as well as for interacting with receptor-like proteins, e.g., affecting receptor protein dimerization. The polypeptides will also be useful as reagents for detecting or purifying other proteins which associate with the receptors or fragments thereof. The receptor polypeptides will also find use in generating other reagents, e.g., antibodies specific for binding epitopes peculiar to the modified receptors. In particular, antibodies raised against newly formed ligand binding determining segments may serve as ligands for the modified receptors. These techniques may provide for separating various functionalities of the receptors, thereby isolating each of the different effector functions from others, in response to PDGF binding. The modified receptors of the present invention also provide methods for assaying ligands for them. For example, soluble ligand binding fragments will be useful as competing sites for ligand binding, a useful property in a ligand binding assay. In particular, the present invention provides an assay to screen for PDGF binding inhibition, allowing screening of large numbers of compounds. These compounds may be assayed in vitro, which allows testing of cytotoxic or membrane disruptive compounds. The present solid phase system allows reproducible, sensitive, specific, and readily automated assay procedures. Polystyrene 96-well plates may be coated with the appropriate construct with LBR's to assay for ligand binding activity. Moreover, modifications to the ligand binding domains will lead to binding region combinations with different ligand binding affinities. Thus, modulation of ligand effected response may be easily achieved by inclusion of the appropriate affinity modified analogue. Solid phase assays using these modified receptors may also be developed, providing greater sensitivity or improved capacity over unmodified binding regions. Diagnostic kits comprising these reagents are also provided. The kit typically comprise a compartmentalized enclosure, e.g., a plastic substrate having diagnostic reagents of the invention attached thereto. The package will typically also include various buffers, labeling reagents, and other reagents as appropriate for the diagnostic test to be performed. Instructions for use of the related reagents and interpretation of the results will be provided. In particular, the important functional segment of the extracellular domain will usually be attached to a plastic or other solid phase substrate. The binding regions will usually be selected for a combination of the affinity and ligand binding spectrum of the modified binding segments. Appropriate ligands will often be introduced to determine the ligand binding activity and affinity. Different LBR combinations will be used, and can be used to test for differently modified, e.g., labeled, ligands. In addition, the peptides will be useful for therapeutic administration. The quantities of reagents necessary for effective therapy will depend upon many different factors, including means of administration, target site, physiological state of the patient, and other medicants administered. Thus, treatment dosages should be titrated to optimize safety and efficacy. Typically, dosages used in vitro may provide useful guidance in the amounts useful for in situ administration of these reagents. Animal testing of effective doses for treatment of particular disorders will provide further predictive indication of human dosage. Various considerations are described, e.g., in Gilman et al. (eds) , (1990) Goodman and Gilman's: The Pharmacological Basis of Therapeutics, 8th ed. , Pergamon Press; and Remington's Pharmaceutical Sciences. (1985) 7th ed. , Mack Publishing Co., Easton, Penn. ; each of which is hereby incorporated by reference. Methods for administration are discussed therein, e.g., for oral, intravenous, intraperitoneal, or intramuscular administration, transdermal diffusion, and others. Pharmaceutically acceptable carriers will include water, saline, buffers, and other compounds described, e.g., in the Merck Index, Merck & Co., Rahway, New Jersey. Because of the high affinity binding between PDGF and its receptors, low dosages of these reagents would be initially expected to be effective. Thus, dosage ranges would ordinarily be expected to be in amounts lower than 1 mM concentrations, typically less than about 10 μM concentrations, usually less than about 100 nM, preferably less than about 10 pM (picomolar) , and most preferably less than about 1 fM (femtomolar) , with an appropriate carrier. The pharmaceutical compositions will be administered by parenteral, topical, oral or local administration, such as by aerosol or transdermally, for prophylactic and/or therapeutic treatment. The pharmaceutical compositions 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 include powder, tablets, pills, capsules and dragees. Preferably, the pharmaceutical compositions are administered intravenously. Thus, this invention provides compositions for intravenous administration which comprise a solution of the compound dissolved or suspended in an acceptable carrier, preferably an aqueous carrier. A variety of aqueous carriers may be used, e.g., water, buffered water, 0.4% saline, and the like. These compositions may be sterilized by conventional, well known sterilization techniques, or may be sterile filtered. The resulting aqueous solutions may be packaged for use as is, or lyophilized, the lyophilized preparation being combined with a sterile aqueous solution prior to administration. The compositions may contain pharmaceutically acceptable auxiliary substances as required to approximate physiological conditions, such as pH adjusting and buffering agents, tonicity adjusting agents, wetting agents and the like, for example, sodium acetate, sodium lactate, sodium chloride, potassium chloride, calcium chloride, sorbitan monolaurate, triethanolamine oleate, etc. For solid compositions, conventional nontoxic solid carriers may be used which include, for example, pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharin, talcum, cellulose, glucose, sucrose, magnesium carbonate, and the like. For oral administration, a pharmaceutically acceptable nontoxic composition is formed by incorporating any of the normally employed excipients, such as those carriers previously listed, and generally 10-95% of active ingredient, preferably about 20% (see. Remington's. supra) . For aerosol administration, the compounds are preferably supplied in finely divided form along with a surfactant and propellant. The surfactant must, of course, be nontoxic, and preferably soluble in the propellant. Representative of such agents are the esters or partial esters of fatty acids containing from 6 to 22 carbon atoms, such as caproic, octanoic, lauric, palmitic, stearic, linoleic, linolenic, olesteric and oleic acids with an aliphatic polyhydric alcohol or its cyclic anhydride such as, for example, ethylene glycol, glycerol, erythritol, arabitol, mannitol, sorbitol, the hexitol anhydrides derived from sorbitol, and the polyoxyethylene and polyoxypropylene derivatives of these esters. Mixed esters, such as mixed or natural glycerides may be employed. The surfactant may constitute 0.1%-20% by weight of the composition, preferably 0.25-5%. The balance of the composition is ordinarily propellant. Liquefied propellants are typically gases at ambient conditions, and are condensed under pressure. Among suitable liquefied propellants are the lower alkanes containing up to 5 carbons, such as butane and propane; and preferably fluorinated or fluorochlorinated alkanes. Mixtures of the above may also be employed. In producing the aerosol, a container equipped with a suitable valve is filled with the appropriate propellant, containing the finely divided compounds and surfactant. The ingredients are thus maintained at an elevated pressure until released by action of the valve. The compositions containing the compounds can be administered for prophylactic and/or therapeutic treatments. In therapeutic applications, compositions are administered to a patient already suffering from a disease, as described above, in an amount sufficient to cure or at least partially arrest the symptoms of the disease and its complications. An amount adequate to accomplish this is defined as "therapeutically effective dose." Amounts effective for this use will depend on the severity of the disease and the weight and general state of the patient. In prophylactic applications, compositions containing the compounds of the invention are administered to a patient susceptible to or otherwise at risk of a particular disease. Such an amount is defined to be a "prophylactically effective dose." In this use, the precise amounts again depend on the patient's state of health and weight. The invention will better be understood by reference to the following illustrative examples. The following examples are offered by way of illustration and not by way of limitation. EXPERIMENTAL In general, standard techniques of recombinant DNA technology are described in various publications, e.g., Sambrook et al. (1989) Molecular Cloning: A Laboratory Manual. Cold Spring Harbor Laboratory; Ausubel et al. (1987) Current Protocols in Molecular Biology, vols. 1 and 2 and supplements; and Wu and Grossman (eds.) (1987) Methods in Enzymology. Vol. 53 (Recombinant DNA Part D) ; each of which is incorporated herein by reference. I. Human Extracellular Redion Equivalent techniques for construction, expression, and determination of the physiological effect of truncation or deletion analogues of the soluble extracellular receptor fragments from the human receptor may be performed using the nucleic acid, polypeptide, and other reagents provided herein. A. Type B Segments Constructs of type B receptor polypeptides were made as follows: The 3.9 kb EcoRI-Hind III cDNA fragment of the human type B hPDGF-R was subcloned into the EcoRI-Hind III site of M13 Mplδ to produce a vector MplδPR. For techniques, see Maniatis et al. (1982) Molecular Cloning: A Laboratory Manual. Cold Spring Harbor, N.Y., which is incorporated herein by reference. Verification of subcloning was performed by restriction enzyme digestion analysis and dideoxy chain termination sequencing, as described by Sanger et al. (1977) Proc. Nat'l Acad. Sci. USA 74:5463. Oligonucleotide directed in vitro mutagenesis was performed according to the method described by Kunkel et al. (1987) Methods in Enzvmol.. 154:367. The strategy for oligonucleotide directed in vitro deletion mutagenesis of MplδPR is outlined in Fig. 1. In brief, a series of oligonucleotides were designed to create a nested set of soluble type B hPDGF receptor extracellular regions by deletion mutagenesis. These domains are designated Domain 1 through Domain 5 (D1-D5) , suitable for expression in an appropriate eukaryotic expression system. A description of the mutagenic oligonucleotides aligned with the corresponding regions of the human PDGF receptor are listed in Table 10. The resulting constructs are labeled as indicated in Table 13. The antisense strand was used for mutagenesis throughout. Mutagenesis of PΔ1, PΔ2, PΔ3, PΔ4, and PΔ5, utilized MplδPR as the template and mutagenesis of PΔ6, PΔ7, PΔ8, and PΔ9, utilized MP 18 PΔl as the template. PΔ1, a 41 bp oligomer, introduced a TAG stop codon after Lysine 499 ( 499 ) of D5 and removed the transmembrane (TM) as well as entire intracellular kinase domain (K) , producing an Mpl8 PΔl (see Fig. 1) . PΔl codes for 530 148 precursor proteins. TABLE 13 HUMAN TYPE B PDGF-R EXPRESSION CONSTRUCTS Soluble Membrane Bound pBJPR pBJPΔl PBJPΔ2 pBJPΔ3 pBJPΔ4 pBJPΔ5 pBJPΔ6 pBJPΔ7 pBJPΔδ PBJPΔ9 The human PDGF receptor constructs were subsequently subcloned into the EcoRI-Hind III site of pBJl a derivation of pCDL-SRα296, as described in Takabe et al. (1968) Molec. Cell Biol. 8:466, and co-transfected with pSV2NEO, as described by Southern and Berg (1982) J. Mol. Appl. Gen.. 1: 327, into Chinese hamster ovary cells (CHO) . See Figs. 2 and 3. Function of the constructs was demonstrated as follows: A sample of 0.33 nM PDGF BB ligand is preincubated for 1 hr at 4'C under the following conditions: 1. a polyclonal antibody to human PDGF (this antibody recognizes human PDGF AA, PDGF BB and PDGF AB) ; 2. 18 nM (60 fold molar excess to PDGF BB) human type B PDGF receptor; 3. phosphate buffered saline solution that the receptor and antibody are in; or 4. no additions but the ligand itself. In a duplicate set of experiments, 0.33 nM PDGF AA is incubated with three of the above preiπcubation conditions, e.g., 2, 3, and 4 above. The human type B PDGF receptor does not appreciably recognize PDGF AA but this ligand will still activate cell-associated human type A PDGF receptor from NIH3T3 cells and so is a control for human type B PDGF receptor specificity and PDGF BB-dependent activation versus non¬ specific general cellular effect, e.g. , cytotoxicity. The preincubated materials were in a final volume of 0.5 ml. They were placed in one well each of a six well tissue culture dish containing a confluent layer of serum starved (quiescent) NIH3T3 cells which were chilled to 4'C. The cells and incubation mixtures were agitated, e.g., rocked, at 4'C for 2 h. They were then washed twice with 4'C phosphate buffered saline. Forty μl of 125 mM Tris(hydroxymethyl)amino methane (Tris), pH 6.8, 20% (v/v) glycerol, 2% (w/v) sodium dodecyl sulfate (SDS), 2% (v/v) 2-mercaptoethanol, and 0.001% bromphenol blue, (known as SDS sample buffer) , was added per microtiter well followed by 40 μl of 100 mM Tris, pH 8.0, 30 mM sodium pyrosphoshate, 50 mM sodium fluoride, 5 mM ethylenediaminetetraacetic acid (EDTA) , 5 mM ethylenebis(oxyethylenenitrilio)tetraacetic acid, 1% (w/v) SDS, 100 mM dithiothreitol, 2 mM phenylmethylsulfonylfluoride (PMSF) , and 200 μM sodium vanadate was added to the cells. The cells were solubilized and 40 μl additional SDS sample buffer was added to the solubilizate. This material was boiled 5 minutes and loaded onto a single gel sample well of a 7.5% sodium dodecyl sulfate polyacrylamide gel. Cellular proteins were separated by electrophoresis. The separated proteins were transferred to nitrocellulose by electrotransfer and the resulting "Western blot" was incubated with 3 changes of 0.5% (w/v) sodium chloride, 5 mg/ml bovine serum albumin, 50 mM Tris, pH 7.5, (designated blocking buffer) for 20 minutes each at room temperature. A 1/1000 dilution of PY20 (a commercially available monoclonal antibody to phosphotyrosine [ICN]) in blocking buffer was incubated with the blot overnight at 4°C. The blot was washed 3 times for 20 minutes each at room temperature in blocking buffer. The blot was incubated with 4 μCi/40 ml of 125 I-Protein A [Amersham] in blocking buffer for 1 hour at room temperature and washed 3 times for 20 minutes each at room temperature in blocking buffer. The blot was exposed to X-ray film for 48 h with one intensifying screen at -70"C and developed with standard reagents. Figure 4 shows the results of the autoradiogra with the conditions mentioned above plus the additional condition of no added ligand (no PDGF) . This added condition defines the level of cell-associated receptor activation (e.g., phosphorylation) in the absence of any added ligand. Both the antibody and the human type B PDGF receptor neutralized the activation of cell-associated PDGF receptor by PDGF BB. This is apparently due to direct binding and sequestration of the ligand making it unavailable for PDGF receptor activation. pl85 shows the receptor position. B. Type A Sequence Similar manipulations using the mutagenic oligonucleotides of Table 12 are used to construct the type A constructs listed in Table 15. Note that the type A constructs have not actually been produced, but would readily be produced by these methods. Similar assays are used to test the function of the constructs. TABLE 15 SUGGESTED HUMAN TYPE A PDGF-R EXPRESSION CONSTRUCTS type A Soluble Membrane Bound pARSR pARSΔl pARSΔ2 pARSΔ3 pARSΔ4 pARSΔ5 pARSΔ6 pARSΔ7 pARSΔ8 pARSΔ9 C. PDGF Plate Assay Polystyrene microtiter plates (Immulon, Dynatech Laboratories) were coated with the extracellular region fragment of the type B human PDGF receptor (described above) by incubating approximately 10-100 ng of this protein per well in 100 μl of 25 mM Tris, 75 mM NaCl, pH 7.75 for 12 to 18 h at 4'C. The protein was expressed in transfected CHO cells and collected in serum-free media (Gibco MEMα) at a concentration of 0.2 - 1 μg/ml, with a total protein concentration of 150 - 300 μg/ml. The human PDGF type B receptor extracellular region fragment was concentrated and partially purified by passing the media over wheat germ-agglutinin-sepharose at 4*C (at 48 ml/h) in the presence of 1 mM PMSF. After extensive washing, the protein was eluted in 0.3 M N-acetyl-glucosamine, 25 mM Hepes, 100 mM NaCl, 1 mM PMSF, pH 7.4. This fraction was then applied to Sephacryl S-200 HR (Pharmacia) equilibrated in 0.15 M ammonium bicarbonate pH 7.9. The fractions containing receptor (3 - 10 ng/μl) were detected by SDS-PAGE and Western blotting with a polyclonal rabbit antibody, made by standard methods, against a Domain 1 (Dl) segment from the receptor external region. These fractions (3 - 10 ng/μl) were used to coat the microtiter wells as described above. The wells were then drained, rinsed once with 200 μl each of 0.5% gelatin (Bio-Rad, EIA grade), 25 mM Hepes, 100 mM NaCl, pH 7.4, and incubated for 1-2 h at 24"C with 150 μl of this same solution. The wells were drained and rinsed twice with 0.3% gelatin, 25 mM Hepes, 100 mM NaCl, pH 7.4 (150 μl each). 90 μl of the 0.3% gelatin solution was put in each well (wells used to test nonspecific binding received just 80 μl and then 10 μl of 0.01 mg/ml non- labeled PDGF in the 0.3% gelatin solution). PDGF BB (Amgen) was iodinated at 4'C to 52,000 CPM/ng with di-iodo Bolton- Hunter reagent (Amersham) and approximately 40,000 CPM was added per well in 10 μl, containing 0.024% BSA, 0.4% gelatin, 20 mM Hepes, 60 mM NaCl, 70 mM acetic acid, pH 7.4. The plate was incubated for 2-3 h at 24"C, after which wells were washed three times with 150 μl each with 0.3% gelatin, 25 mM Hepes, 100 mM NaCl, pH 7.4. The bound radioactivity remaining was solubilized from the wells in 200 μl 1% SDS, 0.5% BSA, and counted in a gamma-counter. The nonspecific binding was determined in the presence of a 150-fold excess of unlabeled PDGF BB (Amgen) and was about 7% of the total bound 125 I-PDGF. Similar assays will be possible using type A receptor fragments. However, the type A receptor fragments are more sensitive to the presence of other proteins than the type B fragments, and appear to require a different well coating reagent from the gelatin. Hemoglobin is substituted for gelatin in the buffers at about the same concentrations. Other blocking proteins will be useful selected from, e.g., the Sigma Chemical Company. Titrations to optimize the protein type and concentration will be performed to find proteins which do not affect the receptor protein binding. The present assays require less than 5 ng/well of receptor soluble form, which was expressed in transfected CHO cells, and partially purified by affinity and gel chromatography. Using iodinated PDGF-BB, the specific binding of less than 10 pg of ligand can be detected in an assay volume of 100 μg/well. At 4 # C, the binding of 125 I-PDGF BB to immobilized receptor is saturable and of high affinity. The Kd by Scatchard analysis was about 1 nM with l.δ x 10 10 sites per well. The nonspecific binding, determined in the presence of a 100-fold excess of cold PDGF BB, was usually only about 5-10% of the total binding. The binding was also specific for the isoform of the ligand, insofar as excess cold PDGF AA did not inhibit 125 I-PDGF BB binding. Furthermore, the external region of the type B PDGF receptor in solution competes with its immobilized form for binding iodinated PDGF BB (IC = 5nM) . The 125 I-PDGF BB bound after 4 h at 4'C is only slowly dissociable in binding buffer (t/-__ > 6 h) , but is completely displaced by the addition of a 150-fold excess of unlabeled PDGF BB ( < 1 h) . These studies were made possible by the availability of growth factor preparations devoid of contamination with other growth factors and by the use of a receptor expression system in which all of the measured PDGF responses could be attributed to this single transfected receptor cDNA. All publications and patent applications herein are incorporated by reference to the same extent as if each individual publication or patent application was specifically and individually indicated to be incorporated by reference. The invention now being fully described, it will be apparent to one of ordinary skill in the art that many changes and modifications can be made thereto without departing from the spirit or scope of the appended claims. 7 • ** „_ PCT/US92/00730 "SEQUENCE LISTING" (1) GENERAL INFORMATION: (i) APPLICANT: Wolf, David Tomlinson, Jams E. Fretto, Larry J. Giese, Neill A. Escobedo, Jaime A. Williams, Lewis T. (ii) TITLE OF INVENTION: DOMAINS OF EXTRACELLULAR REGION OF HUMAN PLATELET-DERIVED GROWTH FACTOR RECEPTOR POLYPEPTIDES (iii) NUMBER OF SEQUENCES: 23 (iv) CORRESPONDENCE ADDRESS: (A) ADDRESSEE: TOWNSEND and TOWNSEND (B) STREET: Stβuart Street Tower, 20th Floor \ One Market Plaza (C) CITY: San Francisco (D) STATE: California (E) COUNTRY: US (F) ZIP: 94105 (v) COMPUTER READABLE FORM: (A) MEDIUM TYPE: Floppy disk (B) COMPUTER: IBM PC compatible (C) OPERATING SYSTEM: PC-DOS/MS-DOS (D) SOFTWARE: Patentln Release #1.0, Version #1.25 (vi) CURRENT APPLICATION DATA: (A) APPLICATION NUMBER: (B) FILING DATE: (C) CLASSIFICATION: (viii) ATTORNEY/AGENT INFORMATION: (A) NAME: Ching, Edwin P. (B) REGISTRATION NUMBER: 34,090 (C) REFERENCE/DOCKET NUMBER: 12418-14 (ix) TELECOMMUNICATION INFORMATION: (A) TELEPHONE: (415) 326-2400 (B) TELEFAX: (415) 326-2422 (2) INFORMATION FOR SEQ ID NO:l: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 5427 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: double (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA to mRNA (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo Sapiens (B) STRAIN: lambda gtlO (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 187.. 504 (Xi) SEQUENCE DESCRIPTION: SEQ ID NO:l: GGAGGGGGTG ACTGTCCAGA GCCTGGAACT GTGCCCACAC CAGAAGCCAT CAGCAGCAAG 180 GACACC ATG CGG CTT CCG GGT GCG ATG CCA GCT CTG GCC CTC AAA GGC 228 Met Arg Leu Pro Gly Ala Met Pro Ala Leu Ala Leu Lys Gly 1 5 10 GAG CTG CTG TTG CTG TCT CTC CTG TTA CTT CTG GAA CCA CAG ATC TCT 276 Glu Leu Leu Leu Leu Ser Leu Leu Leu Leu Leu Glu Pro Gin lie Ser 15 20 25 30 CAG GGC CTG GTC GTC ACA CCC CCG GGG CCA GAG CTT GTC CTC AAT GTC 324 Gin Gly Leu val Val Thr Pro Pro Gly Pro Glu Leu Val Leu Asn Val 35 40 45 TCC AGC ACC TTC GTT CTG ACC TGC TCG GGT TCA GCT CCG GTG GTG TGG 372 Ser Ser Thr Phe Val Leu Thr Cys Ser Gly Ser Ala Pro Val Val Trp 50 55 60 GAA CGG ATG TCC CAG GAG CCC CCA CAG GAA ATG GCC AAG GCC CAG GAT 420 Glu Arg Met Ser Gin Glu Pro Pro Gin Glu Met Ala Lys Ala Gin Asp 65 70 75 GGC ACC TTC TCC AGC GTG CTC ACA CTG ACC AAC CTC ACT GGG CTA GAC 68 Gly Thr Phe Ser Ser val Leu Thr Leu Thr Asn Leu Thr Gly Leu Asp 80 85 90 ACG GGA GAA TAC TTT TGC ACC CAC AAT GAC TCC CGT GGA CTG GAG ACC 516 Thr Gly Glu Tyr Phe Cys Thr His Asn Asp Ser Arg Gly Leu Glu Thr 95 100 105 110 GAT GAG CGG AAA CGG CTC TAC ATC TTT GTG CCA GAT CCC ACC GTG GGC 564 Asp Glu Arg Lys Arg Leu Tyr lie Phe Val Pro Asp Pro Thr val Gly 115 120 125 TTC CTC CCT AAT GAT GCC GAG GAA CTA TTC ATC TTT CTC ACG GAA ATA 612 Phe Leu Pro Asn Asp Ala Glu Glu Leu Phe lie Phe Leu Thr Glu lie 130 135 140 ACT GAG ATC ACC ATT CCA TGC CGA GTA ACA GAC CCA CAG CTG GTG GTG 660 Thr Glu He Thr He Pro Cys Arg Val Thr Asp Pro Gin Leu Val Val 145 150 155 ACA CTG CAC GAG AAG AAA GGG GAC GTT GCA CTG CCT GTC CCC TAT GAT 708 Thr Leu His Glu Lys Lys Gly Asp Val Ala Leu Pro Val Pro Tyr Asp 160 165 170 CAC CAA CGT GGC TTT TCT GGT ATC TTT GAG GAC AGA AGC TAC ATC TGC 756 His Gin Arg Gly Phe Ser Gly He Phe Glu Asp Arg Ser Tyr He Cys 175 180 185 190 AAA ACC ACC ATT GGG GAC AGG GAG GTG GAT TCT GAT GCC TAC TAT GTC 804 Lys Thr Thr He Gly Asp Arg Glu Val Asp Ser Asp Ala Tyr Tyr Val 195 200 205 TAC AGA CTC CAG GTG TCA TCC ATC AAC GTC TCT GTG AAC GCA GTG CAG 852 Tyr Arg Leu Gin Val Ser Ser He Asn Val Ser Val Asn Ala Val Gin 210 215 220 ACT GTG GTC CGC CAG GGT GAG AAC ATC ACC CTC ATG TGC ATT GTG ATC 900 Thr Val Val Arg Gin Gly Glu Asn He Thr Leu Met cys He Val He 225 230 235 GGG AAT GAT GTG GTC AAC TTC GAG TGG ACA TAC CCC CGC AAA GAA AGT 948 Gly Asn Asp Val Val Asn Phe Glu Trp Thr Tyr Pro Arg Lys Glu Ser 240 245 250 GGG CGG CTG GTG GAG CCG GTG ACT GAC TTC CTC TTG GAT ATG CCT TAC 996 Gly Arg Leu Val Glu Pro Val Thr Asp Phe Leu Leu Asp Met Pro Tyr His He Arg Ser He Leu His He Pro Ser Ala Glu Leu Glu Asp Ser 275 280 285 GGG ACC TAC ACC TGC AAT GTG ACG GAG AGT GTG AAT GAC CAT CAG GAT 1092 Gly Thr Tyr Thr cys Asn Val Thr Glu Ser Val Asn Asp His Gin Asp 290 295 300 GAA AAG GCC ATC AAC ATC ACC GTG GTT GAG AGC GGC TAC GTG CGG CTC 1140 Glu Lys Ala He Asn He Thr Val Val Glu Ser Gly Tyr Val Arg Leu 305 310 315 CTG GGA GAG GTG GGC ACA CTA CAA TTT GCT GAG CTG CAT CGG AGC CGG 1188 Leu Gly Glu Val Gly Thr Leu Gin Phe Ala Glu Leu His Arg Ser Arg 320 325 330 ACA CTG CAG GTA GTG TTC GAG GCC TAC CCA CCG CCC ACT GTC CTG TGG 1236 Thr Leu Gin Val Val Phe Glu Ala Tyr Pro Pro Pro Thr Val Leu Trp 335 340 345 350 TTC AAA GAC AAC CGC ACC CTG GGC GAC TCC AGC GCT GGC GAA ATC GCC 1284 Phe Lys Asp Asn Arg Thr Leu Gly Asp Ser Ser Ala Gly Glu He Ala 355 360 365 CTG TCC ACG CGC AAC GTG TCG GAG ACC CGG TAT GTG TCA GAG CTG ACA 1332 Leu Ser Thr Arg Asn Val Ser Glu Thr Arg Tyr val Ser Glu Leu Thr 370 375 380 CTG GTT CGC GTG AAG GTG GCA GAG GCT GGC CAC TAC ACC ATG CGG GCC 1380 Leu Val Arg Val Lys Val Ala Glu Ala Gly His Tyr Thr Met Arg Ala 385 390 395 TTC CAT GAG GAT GCT GAG GTC CAG CTC TCC TTC CAG CTA CAG ATC AAT 1428 Phe His Glu Asp Ala Glu Val Gin Leu Ser Phe Gin Leu Gin He Asn 400 405 . 410 GTC CCT GTC CGA GTG CTG GAG CTA AGT GAG AGC CAC CCT GAC AGT GGG 1476 Val Pro Val Arg Val Leu Glu Leu Ser Glu Ser His Pro Asp Ser Gly 415 420 425 430 GAA CAG ACA GTC CGC TGT CGT GGC CGG GGC ATG CCG CAG CCG AAC ATC 1524 Glu Gin Thr Val Arg Cys Arg Gly Arg Gly Met Pro Gin Pro Asn He 435 440 445 ATC TGG TCT GCC TGC AGA GAC CTC AAA AGG TGT CCA CGT GAG CTG CCG 1572 He Trp Ser Ala Cys Arg Asp Leu Lys Arg Cys Pro Arg Glu Leu Pro 450 455 460 CCC ACG CTG CTG GGG AAC AGT TCC GAA GAG GAG AGC CAG CTG GAG ACT 1620 Pro Thr Leu Leu Gly Asn Ser Ser Glu Glu Glu Ser Gin Leu Glu Thr 465 470 475 AAC GTG ACG TAC TGG GAG GAG GAG CAG GAG TTT GAG GTG GTG AGC ACA 1668 Asn Val Thr Tyr Trp Glu Glu Glu Gin Glu Phe Glu Val Val Ser Thr 480 485 490 CTG CGT CTG CAG CAC GTG GAT CGG CCA CTG TCG GTG CGC TGC ACG CTG 1716 Leu Arg Leu Gin His Val Asp Arg Pro Leu Ser Val Arg Cys Thr Leu 495 500 505 510 CGC AAC GCT GTG GGC CAG GAC ACG CAG GAG GTC ATC GTG GTG CCA CAC 1764 Arg Asn Ala Val Gly Gin Asp Thr Gin Glu Val He Val Val Pro His 515 520 525 TCC TTG CCC TTT AAG GTG GTG GTG ATC TCA GCC ATC CTG GCC CTG GTG 1812 Ser Leu Pro Phe Lys Val Val Val He Ser Ala He Leu Ala Leu Val 530 535 540 GTG CTC ACC ATC ATC TCC CTT ATC ATC CTC ATC ATG CTT TGG CAG AAG 1860 Val Leu Thr He He Ser Leu He He Leu He Met Leu Trp Gin Lys 560 565 570 GAC GGC CAT GAG TAC ATC TAC GTG GAC CCC ATG CAG CTG CCC TAT GAC 1956 λsp Gly His Glu Tyr He Tyr Val Asp Pro Met Gin Leu Pro Tyr Asp 575 580 585 590 TCC ACG TGG GAG CTG CCG CGG GAC CAG CTT GTG CTG GGA CGC ACC CTC 2004 Ser Thr Trp Glu Leu Pro Arg Asp Gin Leu Val Leu Gly Arg Thr Leu 595 600 605 GGC TCT GGG GCC TTT GGG CAG GTG GTG GAG GCC ACA GCT CAT GGT CTG 2052 Gly Ser Gly Ala Phe Gly Gin Val Val Glu Ala Thr Ala His Gly Leu 610 615 620 AGC CAT TCT CAG GCC ACG ATG AAA GTG GCC GTC AAG ATG CTT AAA TCC 2100 Ser His Ser Gin Ala Thr Met Lys Val Ala Val Lys Met Leu Lys Ser 625 630 635 ACA GCC CGC AGC AGT GAG AAG CAA GCC CTT ATG TCG GAG CTG AAG ATC 2148 Thr Ala λrg Ser Ser Glu Lys Gin Ala Leu Met Ser Glu Leu Lys He 640 645 650 ATG AGT CAC CTT GGG CCC CAC CTG AAC GTG GTC AAC CTG TTG GGG GCC 2196 Met Ser His Leu Gly Pro His Leu Asn Val Val λβn Leu Leu Gly Ala 655 660 665 670 TGC ACC AAA GGA GGA CCC ATC TAT ATC ATC ACT GAG TAC TGC CGC TAC 2244 Cys Thr Lys Gly Gly Pro He Tyr He He Thr Glu Tyr Cys Arg Tyr 675 680 685 GGA GAC CTG GTG GAC TAC CTG CAC CGC AAC AAA CAC ACC TTC CTG CAG 2292 Gly Asp Leu Val Asp Tyr Leu His λrg Asn Lys His Thr Phe Leu Gin 690 695 700 CAC CAC TCC GAC AAG CGC CGC CCG CCC AGC GCG GAG CTC TAC AGC AAT 2340 His His Ser λsp Lys Arg Arg Pro Pro Ser Ala Glu Leu Tyr Ser Asn 705 710 715 GCT CTG CCC GTT GGG CTC CCC CTG CCC AGC CAT GTG TCC TTG ACC GGG 2388 Ala Leu Pro Val Gly Leu Pro Leu Pro Ser His Val Ser Leu Thr Gly 720 725 730 GAG AGC GAC GGT GGC TAC ATG GAC ATG AGC AAG GAC GAG TCG GTG GAC 2436 Glu Ser λsp Gly Gly Tyr Met λsp Met Ser Lys λsp Glu Ser Val Asp 735 740 745 750 TAT GTG CCC ATG CTG GAC ATG AAA GGA GAC GTC AAA TAT GCA GAC ATC 2484 Tyr val Pro Met Leu λsp Met Lys Gly λsp Val Lys Tyr λla λsp He 755 760 765 GλG TCC TCC AAC TAC ATG GCC CCT TAC GAT AAC TAC GTT CCC TCT GCC 2532 Glu Ser Ser Asn Tyr Met Ala Pro Tyr Asp Asn Tyr Val Pro Ser Ala 770 775 780 CCT GAG AGG ACC TGC CGA GCA ACT TTG ATC AAC GAG TCT CCA GTG CTA 2580 Pro Glu Arg Thr Cys Arg Ala Thr Leu He Asn Glu Ser Pro Val Leu 785 790 795 AGC TAC ATG GλC CTC GTG GGC TTC λGC TAC CAG GTG GCC AAT GGC ATG 2628 Ser Tyr Met Asp Leu Val Gly Phe Ser Tyr Gin Val Ala Asn Gly Mat 800 805 810 GAG TTT CTG GCC TCC AAG AAC TGC GTC CAC AGA GAC CTG GCG GCT AGG 2676 Glu Phe Leu Ala Ser Lys Asn Cys Val His Arg Asp Leu Ala Ala Arg 815 820 825 830 AAC GTG CTC ATC TGT GAA GGC AAG CTG ,GTC AAG ATC TGT GAC TTT GGC 2724 Asn Val Leu He Cys Glu Gly Lys Leu ' val Lys He Cys Asp Phe Gly 835 840 845 ACC TTT TTG CCT TTA AAG TGG ATG GCT CCG GAG AGC ATC TTC AAC AGC 2820 Thr Phe Leu Pro Leu Lys Trp Met Ala Pro Glu Ser He Phe Asn Ser 865 870 875 CTC TAC ACC ACC CTG AGC GAC GTG TGG TCC TTC GGG ATC CTG CTC TGG 2868 Leu Tyr Thr Thr Leu Ser Asp Val Trp Ser Phe Gly He Leu Leu Trp 880 885 890 GAG ATC TTC ACC TTG GGT GGC ACC CCT TAC CCA GAG CTG CCC ATG AAC 2916 Glu He Phe Thr Leu Gly Gly Thr Pro Tyr Pro Glu Leu Pro Met Asn 895 900 905 910 GAG CAG TTC TAC AAT GCC ATC AAA CGG GGT TAC CGC ATG GCC CAG CCT 2964 Glu Gin Phe Tyr Asn Ala He Lys Arg Gly Tyr Arg Met Ala Gin Pro 915 920 925 GCC CAT GCC TCC GAC GAG ATC TAT GAG ATC ATG CAG AAG TGC TGG GAA 3012 Ala His λla Ser λsp Glu He Tyr Glu He Met Gin Lys Cys Trp Glu 930 935 940 GAG AAG TTT GAG λTT CGG CCC CCC TTC TCC CAG CTG GTG CTG CTT CTC 3060 Glu Lys Phe Glu He λrg Pro Pro Phe Ser Gin Leu Val Leu Leu Leu 945 950 955 GAG AGA CTG TTG GGC GAA GGT TAC AAA AλG λAG TλC CAG CAG GTG GAT 3108 Glu Arg Leu Leu Gly Glu Gly Tyr Lys Lys Lys Tyr Gin Gin Val Asp 960 965 970 GAG GAG TTT CTG AGG AGT GAC CAC CCA GCC ATC CTT CGG TCC CAG GCC 3156 Glu Glu Phe Leu Arg Ser λsp His Pro λla He Leu λrg Ser Gin λla 975 980 985 990 CGC TTG CCT GGG TTC CAT GGC CTC CGA TCT CCC CTG GAC ACC AGC TCC 3204 λrg Leu Pro Gly Phe His Gly Leu λrg Ser Pro Leu λsp Thr Ser Ser 995 1000 1005 GTC CTC TλT λCT GCC GTG CλG CCC λλT GλG GGT GλC λλC GλC TAT ATC 3252 Val Leu Tyr Thr Ala Val Gin Pro λsn Glu Gly λsp λsn λsp Tyr He 1010 1015 1020 ATC CCC CTG CCT GAC CCC AAλ CCT GλG GTT GCT GλC GλG GGC CCA CTG 3300 He Pro Leu Pro Asp Pro Lys Pro Glu Val λla λsp Glu Gly Pro Leu 1025 1030 1035 GλG GGT TCC CCC λGC CTA GCC AGC TCC ACC CTG AλT GAA GTC AAC ACC 3348 Glu Gly Ser Pro Ser Leu Ala Ser Ser Thr Leu Asn Glu Val Asn Thr 1040 1045 1050 TCC TCA ACC ATC TCC TGT GAC AGC CCC CTG GAG CCC CAG GAC GAA CCA 3396 Ser Ser Thr He Ser Cys Asp Ser Pro Leu Glu Pro Gin λsp Glu Pro 1055 1060 1065 1070 GλG CCA GAG CCC CAG CTT GAG CTC CAG GTG GAG CCG GAG CCG GAG CTG 3444 Glu Pro Glu Pro Gin Leu Glu Leu Gin Val Glu Pro Glu Pro Glu Leu 1075 1080 1085 GAA CAG TTG CCG GAT TCG GGG TGC CCT GCG CCT CGG GCG GAλ GCA GAG 3492 Glu Gin Leu Pro Asp Ser Gly Cys Pro Ala Pro Arg Ala Glu Ala Glu 1090 1095 1100 GAT AGC TTC CTG TAGGGGGCTG GCCCCTACCC TGCCCTGCCT GAλGCTCCCC 3544 λsp Ser Phe Leu 1105 CGCTGCCAGC ACCCAGCATC TCCTGGCCTG GCCTGGCCGG GCTTCCTGTC AGCCAGGCTG 3604 CCCTTATCAG CTGTCCCCTT CTGGAAGCTT TCTGCTCCTG ACGTGTTGTG CCCCAAACCC 3664 TGGGAAλGTT λGGCTTGλTG ACCCAGAATC TλGGATTCTC TCCCTGGCTG ACAGGTGGGG 3844 AGACCGλATC CCTCCCTGGG AλGATTCTTG GλGTTλCTGλ GGTGGTAAAT TAACTTTTTT 3904 CTGTTCAGCC AGCTACCCCT CλλGGλλTCλ TλGCTCTCTC CTCGCACTTT TATCCACCCA 3964 GGAGCTAGGG AAGλGλCCCT λGCCTCCCTG GCTGCTGGCT GAGCTAGGGC CTλGCCTTGA 4024 GCAGTGTTGC CTCATCCAGA λGλAAGCCλG TCTCCTCCCT λTGλTGCCAG TCCCTGCGTT 4084 CCCTGGCCCG AGCTGGTCTG GGGCCATTAG GCAGCCTAAT TAATGCTGGA GGCTGAGCCA 4144 AGTλCλGGλC ACCCCCAGCC TGCAGCCCTT GCCCAGGGCA CTTGGAGCAC ACGCAGCCAT 4204 AGCAAGTGCC TGTGTCCCTG TCCTTCAGGC CCATCAGTCC TGGGGCTTTT TCTTTATCAC 4264 CCTCAGTCTT AATCCATCCA CCλGAGTCTA GAAGGCCλGA CGGGCCCCGC λTCTGTGATG 4324 AGAATGTAAλ TGTGCCAGTG TGGAGTGGCC ACGTGTGTGT GCCAGATATG GCCCTGGCTC 384 TGCATTGGAC CTGCTATGAG GCTTTGGAGG AλTCCCTCAC CCTCTCTGGG CCTCλGTTTC 4444 CCCTTCλλλλ λλTGλATAAG TCGGACTTAT TλλCTCTGAG TGCCTTGCCA GCACTλλCλT 4504 TCTAGAGTAT CCAGGTGGTT GCACATTTGT CCAGλTGλλG CAAGGCCATA TACCCTAλAC 4564 TTCCATCCTG GGGGTCAGCT GGGCTCCTGG GAGATTCCAG ATCACACATC ACACTCTGGG 4624 GACTCAGGAA CCATGCCCCT TCCCCAGGCC CCCAGCλλGT CTCAAGAACA CAGCTGCACA 4684 GGCCTTGACT TAGAGTGACA GCCGGTGTCC TGGλλλGCCC CCAGCAGCTG CCCCAGGGAC 4744 ATGGGλλGλC CACGGGACCT CTTTCλCTAC CCACGATGAC CTCCGGGGGT λTCCTGGGCA 4804 λλλGGGACAλ AGAGGGCAAA TGAGATCACC TCCTGCλGCC CλCCACTCCA GCACCTGTGC 4864 CGAGGTCTGC GTCGλλGλCA GAATGGACAG TGAGGλCλGT TATGTCTTGT AλλλGλCAAG 4924 AλGCTTCλGA TGGGTACCCC AAGAAGGATG TGλGλGGTGG GCGCTTTGGA GGTTTGCCCC 4984 TCACCCACCA GCTGCCCCAT CCCTGλGGCA GCGCTCCATG GGGGTATGGT TTTGTCACTG 5044 CCCAGACCTA GCλGTGACAT CTCλTTGTCC CCAGCCCAGT GGGCATTGGA GGTGCCAGGG 5104 GAGTCAGGGT TGTAGCCAAG ACGCCCCCGC ACGGGGAGGG TTGGGAAGGG GGTGCAGGAA 5164 GCTCAACCCC TCTGGGCACC AλCCCTGCλT TGCλGGTTGG CACCTTACTT CCCTGGGATC 5224 CCAGλGTTGG TCCAAGGAGG GλGAGTGGGT TCTCAATACG GTACCAAAGA TATAATCACC 5284 TAGGTTTACA AλTATTTTTA GGACTCACGT TAACTCλCAT TTATACAGCA GAλATGCTAT 5344 TTTGTATGCT GTTAλGTTTT TCTλTCTGTG TλCTTTTTTT TλλGGGAAAG ATTTTAATAT 5404 TAAACCTGGT GCTTCTCACT CAC 5427 ( 2 ) INFORMATION FOR SEQ ID NO : 2 : ( i) SEQUENCE CHARACTERISTICS : (A) LENGTH: 1106 amino acids (B) TYPE: amino acid (D) TOPOLOGY : linear ( ii ) MOLECULE TYPE : protein ( xi) SEQUENCE DESCRIPTION : SEQ ID NO : 2 : 20 25 30 Leu val Val Thr Pro Pro Gly Pro Glu Leu Val Leu Asn Val Ser Ser 35 40 45 Thr Phe Val Leu Thr Cys Ser Gly Ser Ala Pro Val Val Trp Glu Arg 50 55 60 Met Ser Gin Glu Pro Pro Gin Glu Met Ala Lys Ala Gin Asp Gly Thr 65 70 75 80 Phe Ser Ser Val Leu Thr Leu Thr Asn Leu Thr Gly Leu Asp Thr Gly 85 90 95 Glu Tyr Phe Cys Thr His Asn Asp Ser λrg Gly Leu Glu Thr λsp Glu 100 105 110 λrg Lys λrg Leu Tyr He Phe Val Pro λsp Pro Thr Val Gly Phe Leu 115 120 125 Pro λsn λsp λla Glu Glu Leu Phe He Phe Leu Thr Glu He Thr Glu 130 135 140 He Thr He Pro cys λrg Val Thr λsp Pro Gin Leu Val Val Thr Leu 145 150 155 160 His Glu Lys Lys Gly λsp Val Ala Leu Pro Val Pro Tyr Asp His Gin 165 170 175 λrg Gly Phe Ser Gly He Phe Glu λsp λrg Ser Tyr He Cys Lys Thr 180 185 190 Thr He Gly λsp λrg Glu Val λsp Ser λsp λla Tyr Tyr Val Tyr Arg 195 200 205 Leu Gin Val Ser Ser He Asn Val Ser Val Asn Ala Val Gin Thr Val 210 215 220 Val Arg Gin Gly Glu Asn He Thr Leu Met cys He Val He Gly Asn 225 230 235 240 Asp Val Val Asn Phe Glu Trp Thr Tyr Pro λrg Lys Glu Ser Gly Arg 245 250 255 Leu Val Glu Pro Val Thr Asp Phe Leu Leu Asp Met Pro Tyr His He 260 265 270 Arg Ser He Leu His He Pro Ser Ala Glu Leu Glu Asp Ser Gly Thr 275 280 285 Tyr Thr Cys Asn Val Thr Glu Ser Val Asn Asp His Gin Asp Glu Lys 290 295 300 Ala He Asn He Thr Val Val Glu Ser Gly Tyr Val Arg Leu Leu Gly 305 310 315 320 Glu Val Gly Thr Leu Gin Phe Ala Glu Leu His λrg Ser λrg Thr Leu 325 330 335 Gin Val Val Phe Glu Ala Tyr Pro Pro Pro Thr Val Leu Trp Phe Lys 340 345 350 Asp Asn Arg Thr Leu Gly Asp Ser Ser Ala Gly Glu He Ala Leu Ser 355 360 365 Thr Arg Asn Val Ser Glu Thr Arg Tyr Val Ser Glu Leu Thr Leu Val 370 375 380 Arg Val Lys Val Ala Glu Ala Gly His Tyr Thr Met Arg Ala Phe His Val Arg Val Leu Glu Leu Ser Glu Ser His Pro Asp Ser Gly Glu Gin 420 425 430 Thr val Arg cys Arg Gly Arg Gly Met Pro Gin Pro λsn He He Trp 435 440 445 Ser Ala Cys Arg Asp Leu Lys Arg cys Pro Arg Glu Leu Pro Pro Thr 450 455 460 Leu Leu Gly Asn Ser Ser Glu Glu Glu Ser Gin Leu Glu Thr Asn Val 465 470 475 480 Thr Tyr Trp Glu Glu Glu Gin Glu Phe Glu Val Val Ser Thr Leu Arg 485 490 495 Leu Gin His Val Asp Arg Pro Leu Ser Val λrg Cys Thr Leu λrg λsn 500 505 510 Ala Val Gly Gin λsp Thr Gin Glu Val He Val Val Pro His Ser Leu 515 520 525 Pro Phe Lys Val Val Val He Ser λla He Leu λla Leu Val Val Leu 530 535 540 Thr He He Ser Leu He He Leu He Met Leu Trp Gin Lys Lys Pro 545 550 555 560 Arg Tyr Glu He Arg Trp Lys Val He Glu Ser Val Ser Ser Asp Gly 565 570 575 His Glu Tyr He Tyr Val Asp Pro Met Gin Leu Pro Tyr Asp Ser Thr 580 585 590 Trp Glu Leu Pro Arg λsp Gin Leu Val Leu Gly λrg Thr Leu Gly Ser 595 600 60S Gly Ala Phe Gly Gin Val Val Glu Ala Thr Ala His Gly Leu Ser His 610 615 620 Ser Gin Ala Thr Met Lys Val Ala Val Lys Met Leu Lys Ser Thr Ala 625 630 635 640 Arg Ser Ser Glu Lys Gin Ala Leu Met Ser Glu Leu Lys He Met Ser 645 650 655 His Leu Gly Pro His Leu Asn Val Val λsn Leu Leu Gly λla Cys Thr 660 665 670 Lys Gly Gly Pro He Tyr He He Thr Glu Tyr Cys λrg Tyr Gly λsp 675 680 685 Leu val λsp Tyr Leu His λrg λsn Lys His Thr Phe Leu Gin His His 690 695 700 Ser Asp Lys Arg Arg Pro Pro Ser Ala Glu Leu Tyr Ser Asn λla Leu 705 710 715 720 Pro Val Gly Leu Pro Leu Pro Ser His Val Ser Leu Thr Gly Glu Ser 725 730 735 Asp Gly Gly Tyr Met Asp Met Ser Lys Asp Glu Ser Val Asp Tyr Val 740 745 750 Pro Met Leu Asp Met Lys Gly Asp Val Lys Tyr Ala Asp He Glu Ser 755 760 765 Ser Asn Tyr Met Ala Pro Tyr Asp Asn Tyr Val Pro Ser Ala Pro Glu Met Asp Leu Val Gly Phe Ser Tyr Gin Val Ala Asn Gly Met Glu Phe 805 810 815 Leu Ala Ser Lys Asn Cys Val His Arg Asp Leu Ala Ala Arg Asn Val 820 825 830 Leu He Cys Glu Gly Lys Leu Val Lys lie Cys Asp Phe Gly Leu Ala 835 840 845 Arg Asp He Met Arg Asp Ser Asn Tyr He Ser Lys Gly Ser Thr Phe 850 855 860 Leu Pro Leu Lys Trp Met Ala Pro Glu Ser He Phe λsn Ser Leu Tyr 865 870 875 880 Thr Thr Leu Ser λsp Val Trp Ser Phe Gly He Leu Leu Trp Glu He 885 890 895 Phe Thr Leu Gly Gly Thr Pro Tyr Pro Glu Leu Pro Met λsn Glu Gin 900 905 910 Phe Tyr Asn Ala He Lys Arg Gly Tyr Arg Met Ala Gin Pro Ala His 915 920 925 Ala Ser Asp Glu He Tyr Glu He Met Gin Lys Cys Trp Glu Glu Lys 930 935 940 Phe Glu He Arg Pro Pro Phe Ser Gin Leu Val Leu Leu Leu Glu Arg 945 950 955 960 Leu Leu Gly Glu Gly Tyr Lys Lys Lys Tyr Gin Gin Val Asp Glu Glu 965 970 975 Phe Leu Arg Ser Asp His Pro Ala He Leu Arg Ser Gin Ala Arg Leu 980 985 990 Pro Gly Phe His Gly Leu Arg Ser Pro Leu Asp Thr Ser Ser Val Leu 995 1000 1005 Tyr Thr Ala Val Gin Pro Asn Glu Gly λsp λsn λsp Tyr He He Pro 1010 1015 1020 Leu Pro Asp Pro Lys Pro Glu Val Ala Asp Glu Gly Pro Leu Glu Gly 1C25 1030 1035 1040 Ser Pro Ser Leu Ala Ser Ser Thr Leu Asn Glu Val Asn Thr Ser Ser 1045 1050 1055 Thr He Ser Cys Asp Ser Pro Leu Glu Pro Gin Asp Glu Pro Glu Pro 1060 1065 1070 Glu Pro Gin Leu Glu Leu Gin Val Glu Pro Glu Pro Glu Leu Glu Gin 1075 1080 1085 Leu Pro Asp Ser Gly Cys Pro Ala Pro Arg Ala Glu Ala Glu Asp Ser 1090 1095 1100 Phe Leu 1105 (2) INFORMATION FOR SEQ ID NO: : (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 4100 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: double (D) TOPOLOGY: linear ( iv) ANTI -SENSE : NO (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo Sapiens (B) STRAIN: lambda gtlO (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCλTION: 129..3395 ( i) SEQUENCE DESCRIPTION: SEQ ID NO:3: TTGGAGCTλC λGGGλGλGλλ λCλGλGGAGG λGλCTGCAAG λGλTCATTGG AGGCCGTGGG 60 CACGCTCTTT ACTCCATGTG TGGGACλTTC ATTGCGGAAT λλCλTCGGλG GAGAλGTTTC 120 CCAGAGCT λTG GGG λCT TCC CAT CCG GCG TTC CTG GTC TTA GGC TGT CTT 170 Met Gly Thr Ser His Pro λla Phe Leu Val Leu Gly Cys Leu 1 5 10 CTC ACA GGG CTG AGC CTA ATC CTC TGC CAG CTT TCA TTA CCC TCT ATC 218 Leu Thr Gly Leu Ser Leu He Leu Cys Gin Leu Ser Leu Pro Ser He 15 20 25 30 CTT CCA AAT GAA AλT GAA AAG GTT GTG CAG CTG AλT TC TCC TTT TCT 266 Leu Pro Asn Glu Asn Glu Lys Val Val Gin Leu Asn Ser Ser Phe Ser 35 40 45 CTG AGA TGC TTT GGG GλG λGT Gλλ GTG λGC TGG CλG TλC CCC λTG TCT 314 Leu Arg Cys Phe Gly Glu Ser Glu Val Ser Trp Gin Tyr Pro Met Ser 50 55 60 Gλλ GAA GAG AGC TCC GAT GTG Gλλ ATC AGA AAT GAA GAA AAC AAC AGC 362 Glu Glu Glu Ser Ser λsp Val Glu He λrg λsn Glu Glu λsn λsn Ser 65 70 75 GGC CTT TTT GTG λCG GTC TTG Gλλ GTG λGC λGT GCC TCG GCG GCC CλC 410 Gly Leu Phe Val Thr Val Leu Glu Val Ser Ser λla Ser λla λla His 80 85 90 ACA GGG TTG TAC ACT TGC TλT TλC λλC CλC λCT CλG λCλ Gλλ GλG AAT 458 Thr Gly Leu Tyr Thr Cys Tyr Tyr Asn His Thr Gin Thr Glu Glu Asn 95 100 105 HO GAG CTT GAA GGC AGG CAC ATT TAC ATC TAT GTG CCA GλC CCA GAT GTA 506 Glu Leu Glu Gly Arg His He Tyr He Tyr Val Pro Asp Pro Asp Val 115 120 125 GCC TTT GTA CCT CTA GGA ATG ACG GλT TλT TTλ GTC ATC GTG GAG GAT 554 Ala Phe Val Pro Leu Gly Met Thr Asp Tyr Leu Val He Val Glu Asp 130 135 140 GAT GAT TCT GCC ATT ATA CCT TGT CGC ACλ λCT GλT CCC GAG ACT CCT 602 Asp Asp ser Ala He He Pro Cys Arg Thr Thr Asp Pro Glu Thr Pro 145 150 155 GTA ACC TTA CAC AAC AGT GAG GGG GTG GTA CCT GCC TCC TAC GAC AGC 650 Val Thr Leu His Asn Ser Glu Gly Val Val Pro Ala Ser Tyr Asp Ser 160 165 170 AGA CAG GGC TTT AλT GGG λCC TTC ACT GTA GGG CCC TAT ATC TGT GAG 698 Arg Gin Gly Phe Asn Gly Thr Phe Thr Val Gly Pro Tyr He Cys Glu 175 180 185 190 GCC ACC GTC AAλ GGA AAG AλG TTC CλG λCC ATC CCA TTT AλT GTT TAT 746 Ala Thr Val Lys Gly Lys Lys Phe Gin Thr He Pro Phe Asn Val Tyr 195 200 205 ACC GTG TAT AAG TCA GGG GAA ACG ATT GTG GTC ACC TGT GCT GTT TTT 842 Thr Val Tyr Lys Ser Gly Glu Thr He Val Val Thr cys Ala Val Phe 225 230 235 AλC AAT GAG GTG GTT GAC CTT CAA TGG ACT TAC CCT GGA GAA GTG AAA 890 Asn Asn Glu Val Val Asp Leu Gin Trp Thr Tyr Pro Gly Glu val Lys 240 245 250 GGC Aλλ GGC ATC ACA ATG CTG GAλ GAA ATC AAA GTC CCA TCC ATC AAA 938 Gly Lys Gly He Thr Met Leu Glu Glu He Lys Val Pro Ser He Lys 255 260 265 270 TTG GTG TAC ACT TTG λCG GTC CCC GAG GCC ACG GTG AAA GAC AGT GGA 986 Leu Val Tyr Thr Leu Thr Val Pro Glu Ala Thr Val Lys Asp Ser Gly 275 280 285 GλT TλC Gλλ TGT GCT GCC CGC CλG GCT λCC AGG GAG GTC λλλ Gλλ λTG 1034 λsp Tyr Glu Cys λla λla λrg Gin λla Thr λrg Glu Val Lys Glu Met 290 295 300 AAG Aλλ GTC λCT ATT TCT GTC CAT GAG λλλ GGT TTC ATT GAλ λTC AAA 1082 Lys Lys Val Thr He Ser Val His Glu Lye Gly Phe He Glu He Lys 305 310 315 CCC ACC TTC AGC CAG TTG GAλ GCT GTC λλC CTG CAT GAA GTC AAA CAT 1130 Pro Thr Phe Ser Gin Leu Glu Ala Val Asn Leu His Glu Val Lys His 320 325 330 TTT GTT GTA GAG GTG CGG GCC TAC CCA CCT CCC λGG λTλ TCC TGG CTG 1178 Phe Val Val Glu Val λrg Ala Tyr Pro Pro Pro Arg He Ser Trp Leu 335 340 345 350 λλλ λλC λλT CTG ACT CTG ATT GAA AλT CTC λCT GλG λTC ACC ACT GAT 1226 Lys Asn λsn Leu Thr Leu He Glu λsn Leu Thr Glu He Thr Thr λsp 355 360 365 GTG Gλλ AAG ATT CAG GAλ ATA AGG TAT CGA AGC AAA TTA AλG CTG ATC 1274 Val Glu Lys He Gin Glu He λrg Tyr λrg Ser Lys Leu Lys Leu He 370 375 380 CGT GCT AAG GAA GAλ GAC AGT GGC CAT TAT ACT ATT GTA GCT CAA AAT 1322 Arg Ala Lys Glu Glu Asp Ser Gly His Tyr Thr He Val Ala Gin Asn 385 390 395 GAA GAT GCT GTG AAG AGC TAT ACT TTT GAλ CTG TTA ACT CAλ GTT CCT 1370 Glu Asp Ala Val Lys Ser Tyr Thr Phe Glu Leu Leu Thr Gin val Pro 400 405 410 TCA TCC ATT CTG GAC TTG GTC GAT GAT CAC CAT GGC TCA ACT GGG GGA 1418 Ser Ser He Leu Asp Leu Val Asp Asp His His Gly Ser Thr Gly Gly 415 420 425 430 CλG ACG GTG AGG TGC ACA GCT GAλ GGC λCG CCG CTT CCT GλT ATT GAG 1466 Gin Thr Val Arg Cys Thr λla Glu Gly Thr Pro Leu Pro λsp He Glu 435 440 445 TGG ATG ATA TGC A λ GAT ATT AλG AAA TGT AAT AAT GAA ACT TCC TGG 1514 Trp Met He Cys Lys Asp He Lys Lys Cys Asn Asn Glu Thr Ser Trp 450 455 460 ACT ATT TTG GCC AAC AAT GTC TCA AAC ATC ATC ACG GAG ATC CAC TCC 1562 Thr He Leu Ala Asn Asn Val Ser Asn He He Thr Glu He His Ser 465 470 475 CGA GAC AGG AGT ACC GTG GAG GGC CGT GTG ACT TTC GCC Aλλ GTG GAG 1610 Arg Asp Arg Ser Thr Val Glu Gly Arg Val Thr Phe Ala Lys Val Glu 480 485 490 AAC CGA GAG CTG AλG CTG GTG GCT CCC λCC CTG CGT TCT Gλλ CTC ACG 1706 Asn Arg Glu Leu Lys Leu Val Ala Pro Thr Leu Arg Ser Glu Leu Thr 515 520 525 GTG GCT GCT GCA GTC CTG GTG CTG TTG GTG ATT GTG ATC ATC TCA CTT 1754 Val Ala Ala Ala Val Leu Val Leu Leu Val He Val He He Ser Leu 530 535 540 ATT GTC CTG GTT GTC ATT TGG λλλ CAG λλλ CCG λGG TAT GAA ATT CGC 1802 He Val Leu Val Val He Trp Lys Gin Lys Pro λrg Tyr Glu He λrg 545 550 555 TGG λGG GTC ATT GAλ TCA ATC AGC CCA GAT GGA CAT GAA TAT ATT TAT 1850 Trp Arg Val He Glu Ser He Ser Pro λsp Gly His Glu Tyr He Tyr 560 565 570 GTG GλC CCG λTG CλG CTG CCT TλT GλC TCλ AGA TGG GAG TTT CCA AGA 1898 Val λsp Pro Met Gin Leu Pro Tyr λsp Ser λrg Trp Glu Phe Pro λrg 575 580 585 590 GλT GGA CTA GTG CTT GGT CGG GTC TTG GGG TCT GGA GCG TTT GGG AλG 1946 λsp Gly Leu Val Leu Gly λrg Val Leu Gly Ser Gly λla Phe Gly Lys 595 600 605 GTG GTT GAA GGA ACλ GCC TAT GGA TTA AGC CGG TCC CAλ CCT GTC λTG 1994 Val Val Glu Gly Thr λla Tyr Gly Leu Ser λrg Ser Gin Pro Val Met 610 615 620 AAA GTT GCA GTG AAG ATG CTA AAA CCC ACG GCC AGA TCC AGT GAA AAA 2042 Lys Val Ala Val Lys Met Leu Lys Pro Thr λla λrg Ser Ser Glu Lys 625 630 635 Cλλ GCT CTC λTG TCT Gλλ CTG λAG λTλ λTG λCT CλC CTG GGG CCA CAT 2090 Gin λla Leu Met Ser Glu Leu Lys He Met Thr His Leu Gly Pro His 640 645 650 TTG AAC ATT GTA AλC TTG CTG GGλ GCC TGC λCC λλG TCλ GGC CCC λTT 2138 Leu λsn He Val λsn Leu Leu Gly λla Cys Thr Lys Ser Gly Pro He 655 660 665 670 TλC ATC ATC ACA GAG TAT TGC TTC TAT GGA GAT TTG GTC AλC TAT TTG 2186 Tyr He He Thr Glu Tyr Cys Phe Tyr Gly λsp Leu Val λsn Tyr Leu 675 680 685 CAT AAG AAT AGG GAT AGC TTC CTG AGC CλC CAC CCA GAG AAG CCA AλG 2234 His Lys Asn Arg Asp Ser Phe Leu Ser His His Pro Glu Lys Pro Lys 690 695 700 Aλλ GAG CTG GAT ATC TTT GGλ TTG λλC CCT GCT GλT Gλλ λGC λCλ CGG 2282 Lys Glu Leu λsp He Phe Gly Leu λsn Pro λla λsp Glu Ser Thr Arg 705 710 715 AGC TAT GTT ATT TTλ TCT TTT Gλλ λλC AAT GGT GλC TλC λTG GλC λTG 2330 Ser Tyr Val He Leu Ser Phe Glu λsn λsn Gly λsp Tyr Met λsp Met 720 725 730 AAG CAG GCT GAT λCT λCA CAG TAT GTC CCC ATG CTA Gλλ λ& AλA GAG 2378 Lys Gin Ala Asp Thr Thr Gin Tyr Val Pro Met Leu Glu Arg Lys Glu 735 740 745 750 GTT TCT AAA TAT TCC GAC ATC CAG AGA TCA CTC TAT GAT CGT CCA GCC 2426 Val Ser Lys Tyr Ser Asp He Gin Arg Ser Leu Tyr Asp Arg Pro Ala 755 760 765 TCA TAT AAG AλG AλA TCT λTG TTλ GλC TCA GAλ GTC AAλ AAC CTC CTT 2474 Ser Tyr Lys Lys Lys Ser Met Leu Asp Ser Glu Val Lys Asn Leu Leu 770 775 780 TCA GAT GAT AAC TCA GAA GGC CTT ACT TTA TTG GAT TTG TTG AGC TTC 2522 Thr Tyr Gin Val Ala Arg Gly Met Glu Phe Leu Ala Ser Lys Asn Cys 800 805 810 GTC CAC CGT GAT CTG GCT GCT CGC AAC GTT CTC CTG GCA C λ GGA AλA 2618 Val His Arg Asp Leu λla λla λrg λsn Val Leu Leu λla Gin Gly Lys 815 820 825 830 ATT GTG AAG ATC TGT GAC TTT GGC CTG GCC AGA GAC ATC ATG CAT GAT 2666 He Val Lys He Cys λsp Phe Gly Leu λla λrg λsp He Met His λsp 835 840 845 TCG AAC TAT GTG TCG λλλ GGC λGT λCC TTT CTG CCC GTG AλG TGG ATG 2714 Ser λsn Tyr Val Ser Lys Gly Ser Thr Phe Leu Pro Val Lys Trp Met 850 855 860 GCT CCT GAG AGC ATC TTT GAC AλC CTC TAC ACC ACλ CTG AGT GAT GTC 2762 λla Pro Glu Ser He Phe λsp λsn Leu Tyr Thr Thr Leu Ser λsp Val 865 870 875 TGG TCT TλT GGC λTT CTG CTC TGG GλG λTC TTT TCC CTT GGT GGC λCC 2810 Trp Ser Tyr Gly He Leu Leu Trp Glu He Phe Ser Leu Gly Gly Thr 880 885 890 CCT TλC CCC GGC ATG ATG GTG GAT TCT ACT TTC TAC AAT AAG ATC AλG 2858 Pro Tyr Pro Gly Met Met Val λsp Ser Thr Phe Tyr λsn Lys He Lys 895 900 905 910 AGT GGG TAC CGG λTG GCC λλG CCT GλC CλC GCT λCC λGT GAλ GTC TAC 2906 Ser Gly Tyr Arg Met λla Lys Pro λsp His λla Thr Ser Glu val Tyr 915 920 925 GλG ATC ATG GTG AAλ TGC TGG λλC λGT GλG CCG GAG AAG AGλ CCC TCC 2954 Glu He Met Val Lys Cys Trp λsn Ser Glu Pro Glu Lys λrg Pro Ser 930 935 940 TTT TλC CλC CTG λGT GλG λTT GTG GAG AAT CTG CTG CCT GGA CAλ TλT 3002 Phe Tyr His Leu Ser Glu He val Glu λsn Leu Leu Pro Gly Gin Tyr 945 950 955 λλλ λλG λGT TAT GAA Aλλ λTT CλC CTG GλC TTC CTG λλG λGT GAC CAT 3050 Lys Lys Ser Tyr Glu Lys He His Leu Asp Phe Leu Lys Ser λsp His 960 965 970 CCT GCT GTG GCλ CGC λTG CGT GTG GλC TCλ GλC λλT GCA TAC ATT GGT 3098 Pro Ala Val Ala Arg Met Arg val Asp Ser λsp λsn λla Tyr He Gly 975 980 985 990 GTC ACC TAC AλA AAC GAG GAλ GλC λλG CTG λλG GλC TGG GλG GGT GGT 3146 Val Thr Tyr Lys λsn Glu Glu λsp Lys Leu Lys λsp Trp Glu Gly Gly 995 1000 1005 CTG GAT GAG CAG AGλ CTG λGC GCT GλC λGT GGC TλC λTC ATT CCT CTG 3194 Leu Asp Glu Gin Arg Leu Ser Ala λsp Ser Gly Tyr He He Pro Leu 1010 1015 1020 CCT GλC ATT GAC CCT GTC CCT GAG GAG GAG GAC CTG GGC AλG λGG λλC 3242 Pro Asp He Asp Pro Val Pro Glu Glu Glu Asp Leu Gly Lys Arg Asn 1025 1030 1035 AGλ CAC AGC TCG CAG ACC TCT GAλ GλG λGT GCC λTT GAG ACG GGT TCC 3290 λrg His Ser Ser Gin Thr Ser Glu Glu Ser λla He Glu Thr Gly Ser 1040 1045 1050 AGC AGT TCC ACC TTC ATC AAG AGA GAG GAC GAG ACC ATT GAλ GλC ATC 3338 Ser Ser Ser Thr Phe He Lys Arg Glu Asp Glu Thr He Glu Asp He 1055 1060 1065 1070 GAC ATG ATG GAC GAC ATC GGC ATA GAC TCT TCA GAC CTG GTG GAA GAC 3386 Asp Met Met Asp Asp He Gly He Asp Ser Ser Asp Leu Val Glu Asp Ser Phe Leu ACCTCTGGAT CCCGTTCAGA λλλCCACTTT ATTGCAATGC GGAGGTTGAG AGGAGGACTT 3495 GGTTGATGTT TλλλGλGλλG TTCCCAGCCA AGGGCCTCGG GGAGCCTTTC TAAATATGAA 3555 TGAATGGGλT ATTTTGλλλT GλλCTTTGTC λGTGTTGCCT CTTGCAATGC CTCλGTλGCA 3615 TCTCAGTGGT GTGTGAAGTT TGGAGATAGA TGGλTλλGGG AATAATλGGC CACAGAAGGT 3675 GλλCTTTCTG CTTCAAGGAC ATTGGTGAGA GTCCAACAGA CACAATTTAT ACTGCGλCAG 3735 AACTTCλGCλ TTGTAATTAT GTAAATAACT CTAACCACGG CTGTGTTTAG ATTGTATTAλ 3795 CTλTCTTCTT TGGACTTCTG AAGλGACCAC TCAλTCCATC CATGTACTTC CCTCTTGAλA 3855 CCTGATGTCλ GCTGCTGTTG λλCTTTTTAA λGλλGTGCAT GλλλλλCCλT TTTTGλCCTT 3915 λλλλGGTACT GGTACTATAG CATTTTGCTA TCTTTTTTAG TGTTAAAGAG ATAAAGAATA 3975 ATλλTTλλCC λλCCTTGTTT λλTAGATTTG GGTCATTTAG AAGCCTGACA λCTCλTTTTC 4035 λTλTTGTAAT CTATGTTTAT AλTACTACTA CTGTTATCAG TAATGCTAAA TGTGTλλTλA 4095 TGTAA 4100 (2) INFORMATION FOR SEQ ID NO:4: (i) SEQUENCE CHARACTERISTICS: (λ) LENGTH: 1089 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (Xi) SEQUENCE DESCRIPTION: SEQ ID NO:4: Met Gly Thr Ser His Pro λla Phe Leu Val Leu Gly Cys Leu Leu Thr 1 5 10 15 Gly Leu Ser Leu He Leu Cys Gin Leu Ser Leu Pro Ser He Leu Pro 20 25 30 Asn Glu Asn Glu Lys Val Val Gin Leu λsn Ser Ser Phe Ser Leu λrg 35 40 45 Cys Phe Gly Glu Ser Glu Val Ser Trp Gin Tyr Pro Met Ser Glu Glu 50 55 60 Glu Ser Ser λsp Val Glu He λrg λsn Glu Glu λsn λsn Ser Gly Leu 65 70 75 80 Phe val Thr Val Leu Glu Val Ser Ser λla Ser λla λla His Thr Gly 85 90 95 Leu Tyr Thr Cys Tyr Tyr λsn His Thr Gin Thr Glu Glu λsn Glu Leu 100 105 no Glu Gly λrg His He Tyr He Tyr Val Pro λsp Pro λsp Val Ala Phe 115 120 125 Val Pro Leu Gly Met Thr Asp Tyr Leu Val He Val Glu Asp Asp Asp 130 135 140 Ser Ala He He Pro Cys Arg Thr Thr Asp Pro Glu Thr Pro Val Thr 145 150 * 155 160 180 185 190 Val Lys Gly Lys Lys Phe Gin Thr He Pro Phe Asn Val Tyr Ala Leu 195 200 205 Lys Ala Thr Ser Glu Leu Asp Leu Glu Met Glu λla Leu Lys Thr Val 210 215 220 Tyr Lys Ser Gly Glu Thr He Val Val Thr Cys λla Val Phe λsn λsn 225 230 235 240 Glu Val Val λβp Leu Gin Trp Thr Tyr Pro Gly Glu Val Lys Gly Lys 245 250 255 Gly He Thr Met Leu Glu Glu He Lys Val Pro Ser He Lys Leu val 260 265 270 Tyr Thr Leu Thr Val Pro Glu λla Thr Val Lys λsp Ser Gly λsp Tyr 275 280 285 Glu Cys λla λla λrg Gin λla Thr λrg Glu Val Lys Glu Met Lys Lys 290 295 300 Val Thr He Ser Val His Glu Lys Gly Phe He Glu He Lys Pro Thr 305 310 315 320 Phe Ser Gin Leu Glu λla Val λsn Leu His Glu Val Lys His Phe Val 325 330 335 Val Glu Val λrg λla Tyr Pro Pro Pro λrg He Ser Trp Leu Lys λsn 340 345 350 λsn Leu Thr Leu He Glu λsn Leu Thr Glu He Thr Thr λsp Val Glu 355 360 365 Lys He Gin Glu He λrg Tyr λrg Ser Lys Leu Lys Leu He λrg λla 370 375 380 Lys Glu Glu λsp Ser Gly His Tyr Thr He Val λla Gin λsn Glu λsp 385 390 395 400 λla Val Lys Ser Tyr Thr Phe Glu Leu Leu Thr Gin val Pro Ser Ser 405 410 415 He Leu λsp Leu Val Asp Asp His His Gly Ser Thr Gly Gly Gin Thr 420 425 430 Val Arg cys Thr Ala Glu Gly Thr Pro Leu Pro Asp He Glu Trp Met 435 440 445 He Cys Lys Asp He Lys Lys Cys Asn Asn Glu Thr Ser Trp Thr He 450 455 460 Leu Ala Asn Asn Val Ser Asn He He Thr Glu He His Ser Arg Asp 465 470 475 480 Arg Ser Thr Val Glu Gly Arg Val Thr Phe Ala Lys Val Glu Glu Thr 485 490 495 He Ala Val Arg Cys Leu Ala Lys Asn Leu Leu Gly Ala Glu Asn Arg 500 505 510 Glu Leu Lys Leu Val Ala Pro Thr Leu Arg Ser Glu Leu Thr Val Ala 515 520 525 Ala Ala Val Leu Val Leu Leu Val He Val He He Ser Leu He Val 530 535 540 Leu Val Val He Trp Lys Gin Lys Pro Arg Tyr Glu He Arg Trp Arg Pro Met Gin Leu Pro Tyr λsp Ser λrg Trp Glu Phe Pro λrg λsp Gly 580 585 590 Leu Val Leu Gly λrg Val Leu Gly Ser Gly λla Phe Gly Lys Val Val 595 600 605 Glu Gly Thr λla Tyr Gly Leu Ser λrg Ser Gin Pro Val Met Lys Val 610 615 620 Ala Val Lys Met Leu Lys Pro Thr Ala λrg Ser Ser Glu Lys Gin λla 625 630 635 640 Leu Met Ser Glu Leu Lys He Met Thr His Leu Gly Pro His Leu λsn 645 650 655 He Val λsn Leu Leu Gly λla Cys Thr Lys Ser Gly Pro He Tyr He 660 665 670 He Thr Glu Tyr cys Phe Tyr Gly λsp Leu Val λsn Tyr Leu His Lys 675 680 685 λsn λrg λsp Ser Phe Leu Ser His His Pro Glu Lys Pro Lys Lys Glu 690 695 700 Leu Asp He Phe Gly Leu Asn Pro Ala Asp Glu Ser Thr Arg Ser Tyr 705 710 715 720 Val He Leu Ser Phe Glu Asn Asn Gly Asp Tyr Met Asp Met Lys Gin 725 730 735 Ala Asp Thr Thr Gin Tyr Val Pro Met Leu Glu Arg Lys Glu Val Ser 740 745 750 Lys Tyr Ser Asp He Gin λrg Ser Leu Tyr λsp λrg Pro λla Ser Tyr 755 760 765 Lys Lys Lys Ser Met Leu λsp Ser Glu Val Lys λsn Leu Leu Ser λsp 770 775 780 Asp Asn Ser Glu Gly Leu Thr Leu Leu Asp Leu Leu Ser Phe Thr Tyr 785 790 795 800 Gin Val Ala Arg Gly Met Glu Phe Leu λla Ser Lys λsn Cys Val His 805 810 815 Arg Asp Leu Ala Ala Arg Asn Val Leu Leu Ala Gin Gly Lys He Val 820 825 830 Lys He Cys Asp Phe Gly Leu Ala Arg Asp He Met His Asp Ser λsn 835 840 845 Tyr Val Ser Lys Gly Ser Thr Phe Leu Pro Val Lys Trp Met λla Pro 850 855 860 Glu Ser He Phe λsp λsn Leu Tyr Thr Thr Leu Ser λsp Val Trp Ser 865 870 875 880 Tyr Gly He Leu Leu Trp Glu He Phe Ser Leu Gly Gly Thr Pro Tyr 885 890 895 Pro Gly Met Met Val λsp Ser Thr Phe Tyr λsn Lys He Lys Ser Gly 900 905 910 Tyr Arg Met Ala Lys Pro Asp His λla Thr Ser Glu Val Tyr Glu He 915 920 925 Met Val Lys Cys Trp λsn Ser Glu Pro Glu Lys λrg Pro Ser Phe Tyr 930 935 940 Ser Tyr Glu Lys He His Leu λsp Phe Leu Lys Ser Asp His Pro Ala 965 970 975 Val Ala Arg Met λrg Val λsp Ser λsp λsn λla Tyr He Gly Val Thr 980 985 990 Tyr Lys Asn Glu Glu Asp Lys Leu Lys Asp Trp Glu Gly Gly Leu Asp 995 1000 1005 Glu Gin Arg Leu Ser Ala Asp Ser Gly Tyr He He Pro Leu Pro Asp 1010 1015 1020 He Asp Pro Val Pro Glu Glu Glu Asp Leu Gly Lys λrg λsn λrg His 1025 1030 1035 1040 Ser Ser Gin Thr Ser Glu Glu Ser λla He Glu Thr Gly Ser Ser Ser 1045 1050 1055 Ser Thr Phe He Lys λrg Glu λsp Glu Thr He Glu λsp He λsp Met 1060 1065 1070 Met Asp Asp He Gly He λsp Ser Ser λsp Leu Val Glu λβp Ser Phe 1075 1080 1085 Leu (2) INFORMλTION FOR SEQ ID NO:5: (i) SEQUENCE CHλRλCTERISTICS: (λ) LENGTH: 6375 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: double (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNλ to mRNλ (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo Sapiens (B) STRAIN: lambda gtlO (ix) FEATURE: (A) NλME/KEY: CDS (B) LOCATION: 129..3395 (D) OTHER INFORMATION: /note- "nucleotide number 1 of this sequence is identical to the nucleotide number 1 of the previous 4100 long sequence" (xi) SEQUENCE DESCRIPTION: SEQ ID NO:5: TTGGAGCTAC AGGGAGAGAλ λCλGλGGλGG AGλCTGCAAG λGλTCATTGG AGGCCGTGGG 60 CACGCTCTTT ACTCCATGTG TGGGACATTC ATTGCGGAAT AλCATCGGAG GλGAAGTTTC 120 CCλGAGCTAT GGGGACTTCC CATCCGGCGT TCCTGGTCTT AGGCTGTCTT CTCλCλGGGC 180 TGλGCCTAAT CCTCTGCCAG CTTTCATTAC CCTCTATCCT TCCAAATGAA AλTGAλλλGG 240 TTGTGCAGCT GAATTCATCC TTTTCTCTGA GATGCTTTGG GGAGλGTGAA GTGAGCTGGC 300 AGTACCCCAT GTCTGAAGAA GAGAGCTCCG ATGTGGAAAT CAGAAATGAA GAAAACAACA 360 GCGGCCTTTT TGTGACGGTC TTGGAAGTGA GCAGTGCCTC GGCGGCCCAC ACAGGGTTGT 420 TCATCGTGGA GGATGλTGλT TCTGCCλTTA TACCTTGTCG CACAλCTGλT CCCGAGACTC 600 CTGTλλCCTT λCλCAACλGT GAGGGGGTGG TλCCTGCCTC CTACGACAGC AGλCAGGGCT 660 TTAATGGGAC CTTCACTGTλ GGGCCCTλTA TCTGTGAGGC CλCCGTCAAλ GGAAAGλλGT 720 TCCAGACCAT CCCATTTAλT GTTTλTGCTT TAAλλGCλλC λTCλGλGCTG GλTCTλGλλA 780 TGGAλGCTCT TλλλλCCGTG TλTλλGTCλG GGGλλACGAT TGTGGTCACC TGTGCTGTTT 840 TTλλCAATGλ GGTGGTTGλC CTTCAATGGλ CTTλCCCTGG λGλλGTGAAA GGCλλλGGCA 900 TCλCAλTGCT GGλAGAAATC λλAGTCCCAT CCATCAAATT GGTGTACACT TTGACGGTCC 960 CCGAGGCCAC GGTGλλλGλC λGTGGλGλTT λCGλλTGTGC TGCCCGCCAG GCTACCAGGG 1020 λGGTCλλλGλ AATGAAGAAA GTCλCTλTTT CTGTCCATGA GAAAGGTTTC ATTGλAATCA 1080 AλCCCλCCTT CλGCCλGTTG GλλGCTGTCA λCCTGCATGA λGTCλAACAT TTTGTTGTλG 1140 AGGTGCGGGC CTACCCACCT CCCλGGλTλT CCTGGCTGAA AAACAATCTG ACTCTGATTG 1200 λλλATCTCAC TGAGATCACC ACTGλTGTGG AAAAGλTTCA GGAAATλλGG TATCGAAGCA 1260 AATTAAAGCT GλTCCGTGCT AAGGAAGAAG ACAGTGGCCλ TTλTλCTλTT GTλGCTCAAA 1320 ATGAAGλTGC TGTGλλGλGC TλTλCTTTTG λλCTGTTλλC TCλλGTTCCT TCATCCATTC 1380 TGGACTTGGT CGATGATCAC CATGGCTCAA CTGGGGGλCλ GλCGGTGλGG TGCλCλGCTG 1440 AAGGCACGCC GCTTCCTGAT ATTGAGTGGA TGATATGCAA AGATATTAAG AAATGTAATA 1500 ATGλλλCTTC CTGGACTATT TTGGCCλλCλ λTGTCTCAAA CATCATCACG GAGλTCCACT 1560 CCCGAGλCλG GAGTλCCGTG GλGGGCCGTG TGACTTTCGC CAAAGTGGλG GλGλCCATCG 1620 CCGTGCGATG CCTGGCTλλG λλTCTCCTTG GλGCTGAGλλ CCGλGλGCTG λλGCTGGTGG 1680 CTCCCλCCCT GCGTTCTGλλ CTCλCGGTGG CTGCTGCλGT CCTGGTGCTG TTGGTGATTG 1740 TGATCATCTC ACTTATTGTC CTGGTTGTCλ TTTGGλλλCA GAλλCCGλGG TλTGAAATTC 1800 GCTGGAGGGT CλTTGλATCA λTCAGCCCλG ATGGλCλTGλ λTλTλTTTλT GTGGλCCCGA 1860 TGCAGCTGCC TTATGλCTCA λGλTGGGλGT TTCCAAGλGA TGGACTAGTG CTTGGTCGGG 1920 TCTTGGGGTC TGGAGCGTTT GGGλλGGTGG TTGλλGGAAC AGCCTλTGGλ TTλλGCCGGT 1980 CCCAACCTGT CATGAλλGTT GCλGTGλλGA TGCTλλλλCC CλCGGCCAGA TCCAGTGAAA 2040 AACAAGCTCT CATGTCTGAλ CTGλAGλTλλ TGλCTCACCT GGGGCCACAT TTGAACATTG 2100 TλλACTTGCT GGGAGCCTGC λCCλAGTCAG GCCCCλTTTA CATCATCACA GλGTATTGCT 2160 TCTATGGAGA TTTGGTC λC TλTTTGCATA AGAATAGGGA TAGCTTCCTG λGCCλCCACC 2220 CAGAGλλGCC AAAGAAAGAG CTGGλTλTCT TTGGλTTGλλ CCCTGCTGλT GAλλGCACAC 2280 GGAGCTATGT TATTTTATCT TTTGAAλACA λTGGTGλCTA CATGGACλTG λλGCAGGCTG 2340 ATACTACACA GTATGTCCCC λTGCTλGλλλ GGλλλGλGGT TTCTλλATAT TCCGλCATCC 2400 AGAGATCACT CTATGλTCGT CCλGCCTCλT λTλλGλλGAA λTCTATGTTA GACTCAGAAG 2460 TCAAAAACCT CCTTTCAGAT GATAACTCAG AλGGCCTTAC TTTATTGGAT TTGTTGAGCT 2520 TCACCTATCA AGTTGCCCGA GGAATGGAGT TTTTGGCTTC AAAAAATTGT GTCCACCGTG 2580 CAGGAλGTTG CCATGGGλλλ CAAλTλλTTT GAACTTTGGλ λCAGGGTTCT TAAGTTGGTG 920 CGTCCTTCGG ATGATAλλTT TAGGAACCGA λGTCCAATCA CTGTAAATTλ CGGTλGλTCG 4980 ATCGTTAACG CTGGAATTλλ λTTGλλλGGT CλGAATCGAC TCCGACTCTT TCGATTTCAA 5040 ACCAAλλCTG TCCλλAAGGT TTTCATTTCT ACGλTGλλGG GTGACATACC CCCTCTAACT 5100 TGλλλGGGGC AGAGGGCAGA AGAGCGGAGG GTGAGGTATG GGGCGGTTCC TTTCCGTλCA 5160 TGTTTTTAλT λCGTTAAGTC ACAλGGTTCA GAGACACATT GGTCGAGTCA CλλλλCCACC 5220 TTTTTTGTAλ λλTTCλλλλT GλCTATTAAA CTCCAATCTA CCCTCCTACT TAACAGTGTA 5280 GλTλGGTGTG ACAGTTTGTC CλλCCλCλCC CAAGTλλCCG TλAGAλλCGT TλTGλCGλλT 5340 TλACGACTAT GGTλTACTTA CTTTGTACCC GACλCTλλTG ACGTTAGTGA CACGATAGCC 5400 GTCTACTACG λAACCTTCTA CGTCTTCGTT ATTATTTCAT GAACTGATGG ATGACCACAT 5460 TλGAGTTACG TTCGGGGTTG AAλGλλTλGG TTGAAλλλGT ATCATTCACG CTTCTGACTC 5520 GGTCTλλCCG GTTλλTTTTT CTTTTGGACT GATCCλλGλC ATCTCGGTTλ ATCTGλλCTT 5580 TATGCλλλCλ CλλλGλTCTT λGTGTCGAGT TCGTAAGλCA λATAGCGAGT GλGAGGGAAC 5640 ATGTCGGAAT λλλλCAACCλ CGλλλCGTAλ AλCTATAACG λCACTCGGAλ CGTACTGTAG 5700 TλCTCCGGCC TACTTTGλλG λGTCAGGTCG TCλλAGGTCλ GGATTGTTTA CGλGGGTGGλ 5760 CTTAλλCATA TλCTGλCGTλ λλCλCCCACA CλCλCλCλλA λGTCGTTTλλ GGTCTλλλCA 5820 AλGGλλλλCC GGλGGACGTT TCAGAGGTCT TCTTTTAAAC GGTTλGAAAG GλTGAAAGAT 5880 AλAλATACTA CTGTTAGTTT CGGCCGGACT CTTTGTGATA λλCACTGλλλ λλTTTGCTλλ 5940 TCACTλCλGG λλTTTTACAC CλGACGGTTA GACATGTTTT ACCAGGATAA λAACACTTCT 6000 CCCTGTλTTC TλTTTTλCTλ CλλTλTGTλG TTATACATAT λTλCATAAAG ATλTλTCTGλ 6060 ACCTCTTATG λCGGTTTTGT λλλTλCTGTT CGλCATλGTG λCGGAAGCAλ ATλTλλλλλλ 6120 ATTGACACTA TTAGGGGTGT CCGTGTAATT GACAACGTGA λλACTTACAG GTTTTAλλTA 6180 TAAλλTCTTT ATTATTTTTC TTTCTATGλλ TGTλCAAGGG TTTTGTTλCC λCλCCACTTA 6240 CλCACTCTTT TTGATTGλλC TλTCCC GλT GGTTATGTTT TACATAATGC TTACGGGGAC 6300 AAGTλCλλλλ λCAAAATTTT GCACATTTAC TTCTAGAAAT ATAAAGTTAT TTACTATATλ 6360 TTλλλTTTCC TTλλG 6375 (2 ) INFORMλTION FOR SEQ ID NO: 6 : ( i) SEQUENCE CHλRλCTERISTICS : (λ) LENGTH: 41 base pairs (B) TYPE: nucleic acid (C) STRλNDEDNESS : single (D) TOPOLOGY : linear (ii) MOLECULE TYPE: cDNλ (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO ( i) SEQUENCE DESCRIPTION: SEQ ID NO:6: (i) SEQUENCE CHARACTERISTICS: (λ) LENGTH: 41 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO ( i) ORIGINAL SOURCE: (λ) ORGANISM: Homo Sapiens (xi) SEQUENCE DESCRIPTION: SEQ ID NO:7: TCCTTCGACC TACAGATCAA TTAGCTTCCT GTAGGGGGCT G 41 (2) INFORMATION FOR SEQ ID NO:8: (i) SEQUENCE CHARACTERISTICS: (λ) LENGTH: 41 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo Sapiens (xi) SEQUENCE DESCRIPTION: SEQ ID NO:8: ATCACCGTGG TTGAGAGCGG CTAGCTTCCT GTAGGGGGCT G 41 (2) INFORMATION FOR SEQ ID NO:9: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 41 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo Sapiens (xi) SEQUENCE DESCRIPTION: SEQ ID NO:9: TλCAGACTCC λGGTGTCATC CTAGCTTCCT GTAGGGGGCT G 41 (2) INFORMATION FOR SEQ ID NO:10: (i) SEQUENCE CHARλCTERISTICS: (λ) LENGTH: 44 base pairs ( ii) MOLECULE TYPE : cDNA ( iii) HYPOTHETICAL: NO ( iv) ANTI -SENSE : NO (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo Sapiens (xi) SEQUENCE DESCRIPTION: SEQ ID NO:10: CTCTACATCT TTGTGCCAGA TCCCTAGCTT CCTGTAGGGG GCTG 44 (2) INFORMATION FOR SEQ ID NO:11: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 45 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (Vi) ORIGINAL SOURCE: (λ) ORGANISM: Homo Sapiens (Xi) SEQUENCE DESCRIPTION: SEQ ID NO:11: CAGATCTCTC AGGGCCTGGT CλCCGTGGGC TTCCTCCCTλ λTCλT 45 (2) INFORMATION FOR SEQ ID NO:12: (i) SEQUENCE CHARλCTERISTICS: (λ) LENGTH: 48 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo Sapiens (xi) SEQUENCE DESCRIPTION: SEQ ID NO:12: CAGATCTCTC AGGGCCTGGT CATCAACGTC TCTGTGAACG CAGTGCAG 48 (2) INFORMATION FOR SEQ ID NO:13: (i) SEQUENCE CHARλCTERISTICS: (λ) LENGTH: 45 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (iii) HYPOTHETICAL: NO (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo Sapiens (Xi) SEQUENCE DESCRIPTION: SEQ ID NO:13: CAGATCTCTC AGGGCCTGGT CTACGTGCGG CTCCTGGGAG AGCTG 45 (2) INFORMATION FOR SEQ ID NO:14: (i) SEQUENCE CHARλCTERISTICS: (λ) LENGTH: 42 base pairs (B) TYPE: nucleic ac d (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (vi) ORIGINAL SOURCE: (λ) ORGANISM: Homo Sapiens (xi) SEQUENCE DESCRIPTION: SEQ ID NO:14: CAGλTCTCTC λGGGCCTGGT CGTCCGAGTG CTGGAGCTAλ GT 42 (2) INFORMλTION FOR SEQ ID NO:15: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 41 base pairs (B) TYPE: nucleic ac d (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA to mRNA (iii) HYPOTHETICAL: YES (iv) ANTI-SENSE: NO (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo Sapiens (B) STRAIN: lambda gtlO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:15: GCTCCCACCC TGCGTTCTGA ATλλCTGGCG GATTCGAGGG G 41 (2) INFORMλTION FOR SEQ ID NO:16: (i) SEQUENCE CHARλCTERISTICS: (A) LENGTH: 41 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA to mRNA (iii) HYPOTHETICAL: YES (iv) ANTI-SENSE: NO (vi) ORIGINAL SOURCE: (λ) ORGANISM: Homo Sapiens GλλCTGTTλλ CTCλλGTTCC TTAλCTGGCG GλTTCGλGGG G 41 (2) INFORMλTION FOR SEQ ID NO:17: (i) SEQUENCE CHARACTERISTICS: (λ) LENGTH: 41 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNλ to mRNλ (iii) HYPOTHETICAL: YES (iv) λNTI-SENSE: NO (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo Sapiens (B) STRAIN: lambda gtio (xi) SEQUENCE DESCRIPTION: SEQ ID NO:17: ATTTCTGTCC ATGλGλλλGG TTλλCTGGCG GλTTCGλGGG G 41 (2) INFORMλTION FOR SEQ ID NO:18: (i) SEQUENCE CHARACTERISTICS: (λ) LENGTH: 41 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA to mRNλ (iii) HYPOTHETICAL: YES (iv) ANTI-SENSE: NO (vi) ORIGINAL SOURCE: (λ) ORGANISM: Homo Sapiens (B) STRAIN: lambda gtio (xi) SEQUENCE DESCRIPTION: SEQ ID NO:18: TATGC TTAA AAGCλλCλTC ATAACTGGCG GλTTCGλGGG G 41 (2) INFORMλTION FOR SEQ ID NO:19: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 44 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNλ to mRNλ (iii) HYPOTHETICAL: YES (iv) ANTI-SENSE: NO (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo Sapiens (B) STRAIN: lambda g io (xi) SEQUENCE DESCRIPTION: SEQ ID NO:19: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 45 base pairs (B) TYPE: nucleic ac d (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNλ to mRNA (iii) HYPOTHETICAL: YES (iv) ANTI-SENSE: NO (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo Sapiens (B) STRAIN: lambda gtlO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:20: AGCCTAATCC TCTGCCAGCT TGATGTAGCC TTTGTλCCTC TλGGλ 45 (2) INFORMλTION FOR SEQ ID NO:21: (i) SEQUENCE CHARACTERISTICS: (λ) LENGTH: 48 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNλ to mRNλ (iii) HYPOTHETICAL: YES (iv) ANTI-SENSE: NO (Vi) ORIGINAL SOURCE: (λ) ORGANISM: Homo Sapiens (B) STRAIN: lambda gtlO (Xi) SEQUENCE DESCRIPTION: SEQ ID NO:21: λGCCTAATCC TCTGCCAGCT TGAGCTGGAT CTAGλλATGG AAGCTCTT 48 (2) INFORMλTION FOR SEQ ID NO:22: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 45 base pairs (B) TYPE: nucleic ac d (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNλ to mRNλ (iii) HYPOTHETICAL: YES (iv) λNTI-SENSE: NO (vi) ORIGINAL SOURCE: (A) ORGANISM: Homo Sapiens (B) STRAIN: lambda gtlO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:22: AGCCTAATCC TCTGCCAGCT TTTCATTGAA ATCAAACCCA CCTTC 45 (2) INFORMATION FOR SEQ ID NO;23: (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA to mRNλ (iii) HYPOTHETICAL: YES (iv) λNTI-SENSE: NO (vi) ORIGINAL SOURCE: (λ) ORGANISM: Homo Sapiens (B) STRAIN: lambda gtlO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:23: AGCCTAATCC TCTGCCAGCT TTCATCCATT CTGGACTTGG TC 42

Claims: WHAT IS CLAIMED IS: 1. A platelet-derived growth factor receptor (hPDGF-R) fragment of between about 8 and 400 amino acids comprising one or more platelet-derived growth factor (PDGF) ligand binding regions (LBR's) from extracellular domains Dl, D2, or D3, wherein said fragment binds a platelet-derived growth factor ligand. 2. A PDGF-R fragment of Claim 1, wherein said fragment exhibits an affinity of about 5 nM. 3. A PDGF-R fragment of Claim 1, wherein said fragment comprises at least about 15 contiguous amino acids from a domain D3 intra-cysteine region. 4. A PDGF-R fragment of Claim 1, wherein said fragment lacks a transmembrane region. 5. A PDGF-R fragment of Claim 1, wherein said fragment is soluble. 6. A PDGF-R fragment of Claim 1, wherein at least one of said LBR's is a domain D3 LBR. 7. A PDGF-R fragment of Claim 1, wherein at least one of said LBR's is from a type B or type A PDGF-R LBR. 8. A PDGF-R fragment of Claim 1, wherein said fragment is a contiguous sequence within Table 1 or Table 2. 9. A PDGF-R fragment of Claim 1, wherein said fragment is selected from the group of formulae consisting of: a) Xa-Dm-Xc; b) Xa-Dm-Xl-Dn-Xc; c) Xa-Dm-Xl-Dn-X2-Dp-Xc; and d) Xa-Dm-Xl-Dn-X2-Dp-X3-Dq-Xc; wherein: each of Xa, XI, X2, X3, and Xc is, if present, a polypeptide segment lacking a D domain; and each of Dm, Dn, Dp, and Dq is, independently of one another, selected from the group consisting of Dl, D2, D3, D4, and D5. 10. A PDGF-R fragment of Claim 1, wherein said fragment is selected from the group consisting of: a) D1-D2-D3; and b) D1-D2-D3-D4. 11. A soluble human platelet-derived growth factor receptor (hPDGF-R) fragment of less than about 400 amino acids comprising at least one platelet-derived growth factor (PDGF) ligand binding region (LBR) from domain D3, wherein said fragment specifically binds to a platelet-derived growth factor ligand. 12. A hPDGF-R fragment of Claim 11, wherein said fragment comprises a sequence of at least about 15 contiguous amino acids from the intra-cysteine portion of domain D3. 13. A hPDGF-R fragment of Claim 11, wherein said fragment is substantially pure. 14. A hPDGF-R fragment of Claim 11, wherein said LBR is derived from a type B or type A PDGF-R, and further is a sequence in Table 1 or Table 2. 15. A nucleic acid sequence encoding a PDGF-R fragment of Claim 1. 16. A nucleic acid sequence encoding a hPDGF-R fragment of Claim 11. 17. A nucleic acid of Claim 15 wherein said encoding sequence is operably linked to a promoter. 18. A cell comprising a PDGF-R fragment of Claim 1. 19. A cell comprising a hPDGF-R fragment of Claim 11. 20. A mammalian cell comprising a nucleic acid of Claim 15. 21. A mammalian cell comprising a nucleic acid of Claim 16. 22. A cell comprising both a nucleic acid of Claim 15, and a protein expression product of said nucleic acid. 23. An antibody which recognizes an epitope of a PDGF-R fragment of Claim 1, wherein said epitope is not found on a natural PDGF-R. 24. An antibody of Claim 23, wherein said antibody is a monoclonal antibody. 25. A method for measuring the PDGF ligand binding activity of a biological sample comprising the steps of: a) contacting an aliquot of said sample to a PDGF ligand in the presence of a PDGF-R fragment of Claim 1 in a first analysis; b) contacting an aliquot of said sample to a PDGF ligand in the absence of said PDGF-R fragment in a second analysis; and c) comparing the amount of said PDGF ligand binding in the two analyses. 26. A method of Claim 25, wherein said PDGF-R fragment is attached to a cell. 27. A method of Claim 26, wherein said PDGF-R fragment is attached to a solid substrate. 28. A method of Claim 27, wherein said solid substrate is a microtiter dish. 29. A method for measuring the PDGF ligand content of a biological sample comprising the steps of: a) contacting an aliquot of said sample to a ligand binding region (LBR) in the presence of a PDGF-R fragment of Claim 1 in a first analysis; b) contacting an aliquot of said sample to a LBR in the absence of said PDGF-R fragment in a second analysis; and c) comparing the amount of binding in the two analyses. 30. A method of Claim 29, wherein said contacting steps are performed simultaneously.

Inventors: ESCOBEDO JAIME A, FRETTO LARRY J, GIESE NEILL A, TOMLINSON JAMES E, WILLIAMS LEWIS T, WOLF DAVID, ESCOBEDO, JAIME, A., FRETTO, LARRY, J., GIESE, NEILL, A., TOMLINSON, JAMES, E., WILLIAMS, LEWIS, T., WOLF, DAVID
Applicants: COR THERAPEUTICS INC, ESCOBEDO JAIME A, WILLIAMS LEWIS T, COR THERAPEUTICS, INC., ESCOBEDO, JAIME, A., WILLIAMS, LEWIS, T.
Application year: 1992
Main classification: C07H15
IPC codes: A61K38, A61K39, C07K14, C07K16, C12N5, C12N15, C12P21, C12R1, G01N33