NOVEL FIBROBLAST GROWTH FACTOR AND NUCLEIC ACIDS ENCODING SAME

Abstract: The present invention provides FGF-CX, a novel isolated polypeptide, as well as a polynucleotide encoding FGF-CX and antibodies that immunospecifically bind to FGF-CX or any derivative, variant, mutant, or fragment of the FGF-CX polypeptide, polynucleotide or antibody. The invention additionally provides methods in which the FGF-CX polypeptide, polynucleotide and antibody are used in detection and treatment of a broad range of pathological states, as well as other uses.

Description: NOVEL FIBROBLAST GROWTH FACTOR AND NUCLEIC ACIDS ENCODING SAME FIELD OF THE INVENTION The present invention generally relates to nucleic acids and polypeptides The invention relates more particularly to nucleic acids encoding polypeptides related to a member of the fibroblast growth factor family BACKGROUND OF THE INVENTION The fibroblast growth factor (FGF) group of cytokines includes at least 21 members that regulate diverse cellular functions such as growth, survival, apoptosis, motihty and differentiation These molecules transduce signals via high affinity interactions with cell surface tyrosine kmase FGF receptors (FGFRs) These FGF receptors are expressed on most types of cells in tissue culture Dimenzation of FGF receptor monomers upon ligand binding has been reported to be a requisite for activation of the kmase domains, leading to receptor trans phosphorylation FGF receptor- 1 (FGFR-1), which shows the broadest expression pattern of the four FGF receptors, contains at least seven tyrosme phosphorylation sites A number of signal transduction molecules are affected by binding with different affinities to these phosphorylation sites In addition to participating in normal growth and development, known FGFs have also been implicated m the generation of pathological states, including cancer FGFs may contnbute to malignancy by directly enhancing the growth of tumor cells For example, autocnne growth stimulation through the co-expression of FGF and FGFR in the same cell has been reported to lead to cellular transformation SUMMARY OF THE INVENTION The present invention is based, in part, upon the discovery of a nucleic acid encoding a novel polypeptide having homology to members of the Fibroblast Growth Factor (FGF) family of proteins Included in the invention are polynucleotide sequences, which are named Fibroblast Grown Factor-CX (FGF-CX), and the FGF-CX polypeptides encoded by these nucleic acid sequences, and fragments, homologs. analogs, and denvatives thereof, are claimed in the invention An example of an FGF-CX nucleic acid is SEQ ID NO 1, and an example of an FGF-CX polypeptide is a polypeptide including the amino acid sequence of SEQ ID NO 2 This ammo acid sequence is encoded by the nucleic acid sequence of SEQ ID NO 1 In one aspect, the invention includes an isolated FGF-CX polypeptide In some embodiments, the isolated polypeptide includes the amino acid sequence of SEQ ID NO 2 In other embodiments, the invention includes a vanant of SEQ ID NO 2, in which some amino acids residues, e g no more than 1%. 2%, 3%, 5%. 10% or 15% of the amino acid sequences ot SEQ ID NO 2 are changed In some embodiments, the isolated FGF-CX polypeptide includes the ammo acid sequence of a mature form of an ammo acid sequence given b> SEQ ID NO 2. or a vanant of a mature form of an ammo acid sequence given by SEQ ID NO 2 Preterably. no more than 1%, 2%, 3%. 5%, 10% or 15% of the ammo acid sequences of SEQ ID NO, 2 are changed in the vanant of the mature form of the ammo acid sequence Also include in the invention is a fragment of an FGF-CX polypeptide, including tragments of vanant FGF-CX polypeptides, mature FGF-CX polypeptides and vanants of mature FGF-CX polypeptides, as well as FGF-CX polypeptides encoded by allehc vanants and single nucleotide polymorphisms of FGF-CX nucleic acids In another aspect, the invention includes an isolated FGF-CX nucleic acid molecule The FGF-CX nucleic acid molecule can include a sequence encoding any of the FGF-CX polvpeptides, v anants. or fragments disclosed above, or a complement to any such nucleic acid sequence In one embodiment, the sequences include those disclosed m SEQ ID NO 1 In other embodiments, the FGF-CX nucleic acids include a sequence wherein nucleotides different from those given in SEQ ID NO 1 may be incorporated Preferably, no more than 1%, 2%. 3,%, 5%, 10%. 15%, or 20% of the nucleotides are so changed In other embodiments, the invention includes fragments or complements of these nucleic acid sequences Vectors and cells incorporating FGF-CX nucleic are also included m the mv ention The invention also includes antibodies that bind lmmunospecifically to any of the FGF- CX polypeptides descnbed herein The FGF-CX antibodies in vanous embodiments include, e g , polyclonal antibodies, monoclonal antibodies, humanized antibodies and/or human antibodies The invention additionally provides pharmaceutical compositions that include a FGF- CX polypeptide, a FGF-CX nucleic acid or an FGF-CX antibody of the invention Also j included in the invention are kits that include, e g , a. FGF-CX polypeptide, a FGF-CX nucleic acid or a FGF-CX antibody Several methods are included m the inv ention For example, a method is disclosed for determining the presence or amount of a FGF-CX polypeptide of the invention m a sample The method includes contacting the sample with a FGF-CX antibody that binds lmmunospecifically to the polypeptide, and determining the presence or amount of antibody bound to said polypeptide. such that the antibody indicates the presence or amount of polypeptide m the sample Similarly, the mv ention discloses a method for determining the presence or amount of a FGF-CX nucleic acid molecule m a sample The method includes contacting the sample with a probe that binds to the nucleic acid molecule, and determining the presence or amount of the probe bound to the nucleic acid molecule, such that the probe indicates the presence or amount of the FGF-CX nucleic acid molecule in the sample Also provided bv the invention is a method for identifying an agent that binds to a FGF-CX polypeptide The method includes determining whether a candidate substance binds to a FGF-CX polypeptide Binding of a candidate substance indicates the agent is an FGF-CX polypeptide binding agent The mv ention also includes a method for identifying a potential therapeutic agent for use in treatment of a pathology The pathology is, e g , related to aberrant expression, aberrant processing, or aberrant physiological interactions of a FGF-CX polypeptide of the invention This method includes providing a cell which expresses the FGF-CX polypeptide and has a property or function ascnbable to the polypeptide. contacting the provided cell with a composition compnsing a candidate substance, and determining whether the substance alters the property or function ascnbable to the polypeptide, in companson to a control cell Any such substance is identified as a potential therapeutic agent Furthermore, therapeutic agents may be identified by subjecting any potential therapeutic agent identified in this way to additional tests to identify a therapeutic agent for use in treating the pathology In some embodiments, the property or tunction relates to cell growth or cell proliferation, and the substance binds to the polypeptide, thereby modulating an activity of the polypeptide In some embodiments, the candidate substance has a molecular weight not more than about 1500 Da In some embodiments, the candidate substance is an antibody The invention additionally provides any therapeutic agent identified using a method such as those descnbed herein Additional important aspects of the invention relate to methods of treating or preventing a disorder associated with a FGF-CX polypeptide The disorder may be charactenzed by insufficient or ineffective growth of a cell or a tissue, or bv hyperplasia or neoplasm of a cell or a tissue The method includes admimstenng to a subject a FGF-CX polypeptide of the invention or a FGF-CX nucleic acid of the invention, or any other Therapeutic of the invention m an amount and for a duration sufficient to treat or prevent the disorder in said subiect In significant embodiments the subject is a human The invention also includes a method for screening tor a modulator of latency or predisposition to a disorder associated with aberrant expression, aberrant processing, or aberrant physiological interactions of a FGF-CX polypeptide The method includes providing a test animal that recombinantly expresses the FGF-CX polypeptide of the invention and is at increased nsk for the disorder admimstenng a test compound to the test animal, measunng an activity of the polypeptide in the test animal after admimstenng the compound, and companng the acti ity of the FGF-CX polvpeptide in the test animal with the activ ity of the FGF-CX polypeptide m a control animal not administered the compound If there is a change in the activity of the polypeptide in the test animal relative to the control animal, the test compound is a modulator of latency of or predisposition to the disorder The invention also provides a method for determining the presence of or predisposition to a disease associated ith altered levels of a FGF-CX polypeptide or of a FGF-CX nucleic acid of the invention m a first mammalian subject The method includes measunng the level ot expression of the polvpeptide or the amount of the nucleic acid in a sample from the first mammalian subject, and comparing its amount m the sample to its amount present m a control sample from a second mammalian subject known not to hav e, or not to be predisposed to, the disease An alteration in the expression level of the polypeptide or the amount of the nucleic acid m the first subject as compared to the control sample indicates the presence of or predisposition to the disease Also provided by the invention is a method of treating a pathological state in a mammal, wherem the pathology is related to aberrant expression, aberrant processing, or aberrant physiological interactions of a FGF-CX polypeptide of the invention The method includes admimstenng to the mammal a polypeptide of the invention in an amount that is sufficient to alleviate the pathological state, wherem the FGF-CX polypeptide is a polypeptide having an amino acid sequence at least85%, 90%, 95%, 96%, 97%, 98%. or even 99% identical to a polypeptide composing an ammo acid sequence of SEQ ID NO 2, or a biologically active fragment thereof In another related method, an antibody of the invention is administered to the mammal In another aspect, the invention, the invention includes a method of promoting growth of cells in a subject The method includes admimstenng to the subject a FGF-CX polypeptide of the invention in an amount and for a duration that are effective to promote cell growth In some embodiments, the subject is a human, and the cells whose growth is to be promoted may be chosen from among cells in the vicinity ot a wound, cells in the vascular system, cells involved in hematopoiesis, cells involved in erythropoiesis, cells in the lining of the gastrointestinal tract, and cells in hair follicles In a further aspect, the invention provides a method of inhibiting growth of cells in a subject, wherem the growth is related to expression of a FGF-CX polypeptide of the invention This method includes admimstenng to the subject a composition that inhibits growth of the cells In a highly important embodiment, the composition includes an antibody or another therapeutic agent of the invention Significantly, the subject is a human, and the cells whose growth is to be inhibited are chosen from among transformed cells, hyperplastic cells, tumor cells, and neoplastic cells In a still further aspect, the invention provides method of treating or preventing or delaying a tissue proliferation-associated disorder The method includes admimstenng to a subject in which such treatment or prevention or delay is desired a FGF-CX nucleic acid, a FGF-CX polypeptide, or a FGF-CX antibody in an amount sufficient to treat, prevent, or delay a tissue proliferation-associated disorder m the subject The tissue proliferation-associated disorders diagnosed, treated, prevented or delayed using the FGF-CX nucleic acid molecules, polypeptides or antibodies can involve epithelial cells, e g , fibroblasts and keratinocytes in the anterior eye after surgery Other tissue proliferation-associated disorder include, e g , tumors, restenosis, psonasis, Dupuytren's contracture, diabetic complications. Kaposi sarcoma, and rheumatoid arthntis Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs Although methods and matenals similar or equivalent to those descnbed herein can be used in the practice or testing of the present invention, suitable methods and matenals are descnbed below All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety In the case of conflict, the present specification, including definitions, will control In addition, the matenals, methods, and examples are illustrative only and not intended to be limiting Other features and advantages of the invention will be apparent from the following detailed descnption and claims BRIEF DESCRIPTION OF THE DRAWINGS FIG 1 is a representation of the nucleotide sequence (SEQ ID NO 1) and translated ammo acid sequence (SEQ ID NO 2) of a nov el FGF-CX polynucleotide and protein of the invention FIG 2 is a BLASTN alignment of the nucleic acid sequence of SEQ ID NO 1 with a FGF-9-hke Gha- Activating factor (GAF) sequence (SEQ ID NO 5) FIG 3A, FIG 3 B and FIG 3C are BLASTN alignments of the complementary (minus) strand of SEQ ID NO 1 with three discontinuous segments (SEQ ID NOs 6-8, shown in FIG 3A, FIG 3B and FIG 3C, respectively) of an extended genomic DNA fragment of the p21 3- p22 anti-oncogene of hepatocellular colorectal and non-small cell lung cancer segment 1/11 (GenBank Accession Number AB020858) of human chromosome 8 FIG 4 is a ClustalW alignment of four vertebrate FGF-hke proteins (SEQ ID NO 9- 12) with the FGF-CX protein (SEQ ID NO 2) of the present invention Black, gray and white represent identical, conserved and nonconserved residues in the alignment, respectively FIG 5 is a ClustalW alignment of FGF-CX with three other FGF family members FGF-CX was aligned with human FGF-9 human FGF-16 and Xenopus FGF-CX (Accession Numbers D14838. AB009391 and AB012615. respectively) FIG 6 is a BLASTP alignment of the plus strand of FGF-CX polypeptide sequence (SEQ ID NO 2) with a human FGF-9 (FIBROBLAST GROWTH FACTOR-9 (FGF-9) (HBGF-9). GLIA- ACTIVATING FACTOR PRECURSOR (GAF)) (SEQ ID NO 9) indicating 147 of 208 bases (70%) identical ("|") and 170 of 208 bases (81%) positive ("+") residues FIG " is a BLASTX alignment of the plus strand of FGF-CX polypeptide sequence (SEQ ID NO 2) with murme FGF-9 (SEQ ID NO 10) indicating 147 of 208 bases (70%) identical (" ") and 170 of 208 bases (81%) positiv e ("-") residues (Score = 775 (272 8 bits), Expect = 3 4e-76, P = 3 4e-76) FIG 8 is a BLASTX alignment of the plus strand of FGF-CX polypeptide sequence (SEQ ID NO 2) with rat FGF-9 (SEQ ID NO 1 1) indicating 147 of 208 bases (70%) identical ("|") and 170 of 208 bases (81%) positive ("+") residues (Score = 775 (272 8 bits), Expect = 3 4e-76, P = 3 4e-76) FIG 9 is a BLASTX alignment of the plus strand of FGF-CX polypeptide sequence (SEQ ID NO 2) m± λenopus XFGF-CX (SEQ ID NO 12) indicating 170 of 211 bases (80%) identical (" ") and 189 of 211 bases (89%) positive ('V) residues (Score = 906 (318 9 bits), Expect = 4 4e-90, P = 4 4e-90) FIG 10 is a representation of a hydropathy plot of the FGF-CX polypeptide of SEQ ID NO 2. generated with a nineteen residue window FIG 1 1 A and FIG 1 IB show a Western analysis of FGF-CX Samples from 293 cells (FIG 1 1A) or NTH 3T3 cells (FIG 1 IB) transiently transfected with the indicated construct were examined by Western analysis using antι-V5 antibody CM=condιtιoned media, SE=suramm-extracted conditioned media Molecular mass markers are indicated on the left FIG 12 shows a Western analysis of FGF-CX protein secreted by 293 cells FIG 13 presents an analysis of the FGF-CX gene, including the nucleotide and deduced ammo acid sequence of FGF-CX The initiation and stop codons are in bold, and an m frame stop codon residing in the 5' UTR is underlined FIG 14 shows a Western analysis of FGF-CX protein expressed in E coli cells FIG 15A, FIG 15B, FIG 15C and FIG 15D present an analysis of the expression of FGF-CX obtained by real-time quantitative PCR using FGF-CX-specific TaqMan reagents Results for normalized RNA denved from normal human tissue samples are shown in FIG 15 \ and from tumor cell lines in FIG 15B Results obtained using tumor tissues obtained directlv dunng surgery are shown in FIG 15C and FIG 15D FIG 16 A, FIG 16B, and FIG 16C display the biological activity of recombinant FGF-CX as represented by its effects on DNA synthesis Cells were serum-starved, incubated with the indicated factor for 18 hr, and analyzed by a BrdU incorporation assay Samples were performed m triplicate FIG 16A, NIH 3T3 mouse fibroblasts FIG 16B, CCD- 1070 human fibroblasts FIG 16C. CCD- 1106 human keratinocytes FIG 17 displays the biological activity of recombinant FGF-CX as represented by its effects on cell growth NIH 3T3 cells were incubated with serum-free media supplemented with the indicated factor and counted after 48 hr Samples were performed in duplicate FIG 18 presents the biological activity of recombinant FGF-CX as represented by its effects on cell morphology NIH 3T3 cells were incubated with FGF-CX or control protein for 48 hr and photographed at a magnification of X 25 FIG 19 presents a graph representing the tumongemc activity of FGF-CX NIH 3T3 cells stably transfected with the indicated constructs were injected into the subcutis of athymic nude mice and examined for tumor formation over a two week period A minimum of 4 animals was used for each data point DETAILED DESCRIPTION OF THE INVENTION This invention is based in part on the discovery of novel FGF-CX nucleic acid sequences, which encode polypeptides that are members of the fibroblast growth factor (FGF) family As used herein the designation "FGF-CX" relates to nucleic acids, polynucleotides. proteins, polypeptides, and variants, denvativ es and fragments of anv of them, as well as to antibodies that bind lmmunospecifically to any of these classes of compounds Previously descnbed members of the FGF family regulate div erse cellular functions such as growth, surv ival, apoptosis, motihty and differentiation See. e g , Szebenyi & Fallon 1999 Int Rev Cytol 185: 45-106 These molecules transduce signals mtracellularly via high affinity interactions with cell surface tyrosine kmase FGF receptors (FGFRs), four of which have been identified to date See, e g , Xu et al 1999 Cell Tissue Res 296, 33-43, Khnt & Claesson- Welsh 1999 Front Biosci 4: 165-177 These FGF receptors are expressed on most types of cells in tissue culture Dimenzation of FGF receptor monomers upon ligand binding has been reported to be a requisite for activation of the kmase domains, leading to receptor trans phosphorylation FGF receptor- 1 (FGFR-1 ), which sho s the broadest expression pattern of the four FGF receptors, contains at least seven tyrosine phosphorylation sites A number of signal transduction molecules are affected by binding with different affinities to these phosphorylation sites FGFs also bind, albeit with low affinity, to hepann sulfate proteoglycans (HSPGs) present on most cell surfaces and extracellular matnces (ECM) Interactions between FGFs and HSPGs serve to stabilize FGF/FGFR interactions, and to sequester FGFs and protect them from degradation See, e g , Szebenyi et al 1999. abov e Due to its growth-promoting capabilities, one member of the FGF family. FGF-7, is currently m clinical tnals for the treatment of chemotherapy-mduced mucositis See, e g , Damlenko 1999 Toxicol Pathol 27 64-71 In addition to participating in normal growth and development, known FGFs have also been implicated in the generation of pathological states, including cancer See, e g , Basilico & Moscatelh 1992 Adv Cancer Res 59: 115-165 FGFs may contnbute to malignancy by directly enhancing the growth of tumor cells For example, autocnne growth stimulation through the co-expression of FGF and FGFR in the same cell leads to cellular transformation See. e g , Matsumoto-Yoshitomi e al 1997 hit J Cancer 71 : 442-450 Likewise, the constitutive activation of FGFR v ιa mutation or rearrangement leads to uncontrolled proliferation See, e g , Lorenzi et al . 1996 Pi oc Natl Acad Sci USA 93: 8956-8961 , Li et al 1997 Oncogene 14: 1397-1406 Furthermore, some FGFs are angiogemc See. e g , Gerwins et a! 2000 Cut Rex Oncol Hematol 34: 185-194 Such FGFs may contnbute to the tumongenic process by facilitating the development of the blood supply needed to sustain tumor growth Not surpnsingly. at least one FGF is currently under investigation as a potential target for cancer therapv See, e g , Gaspaπni 1999 Drags 58: 17-38 Expression of FGFs and their receptors in the brains of pennatal and adult mice has been examined Messenger RNA all FGF genes, with the exception of FGF-4, is detected in these tissues FGF-3, FGF-6, FGF-7 and FGF-8 genes demonstrate higher expression in the late embryonic stages than in postnatal stages, suggesting that these members are involved m the late stages of bram development In contrast, expression of FGF- 1 and FGF-5 increased after birth In particular, FGF-6 expression m pennatal mice has been reported to be restncted to the central nervous system and skeletal muscles, with intense signals in the developing cerebrum in embryos but m cerebellum in 5-day-old neonates FGF-receptor (FGFR)-4, a cognate receptor for FGF-6, demonstrate similar spatiotemporal expression, suggesting that FGF-6 and FGFR-4 plays significant roles in the maturation of nervous system as a hgand- receptor system According to Ozawa et al , these results strongly suggest that the vanous FGFs and their receptors are involved in the regulation of a vanety of developmental processes of bram, such as proliferation and migration of neuronal progenitor cells, neuronal and ghal differentiation, neunte extensions, and synapse formation Gh a- activating factor (GAF) another FGF family member, is a hepann-bindmg growth factor that was punfied from the culture supernatant of a human ghoma cell line See, Mivamoto et al , 1993, Mol Cell Biol 13(7) 4251-4259 GAF shows a spectrum of activity slightly different from those of other known growth factors, and is designated as FGF-9 The human FGF-9 cDNA encodes a polypeptide of 208 amino acids Sequence similanty to other members of the FGF family was estimated to be around 30% Two cysteine residues and other consensus sequences found in other family members were also well conserved in the FGF-9 sequence FGF-9 was found to have no typical signal sequence in its N terminus like those in acidic FGF and basic FGF Acidic FGF and basic FGF are known not to be secreted from cells m a conventional manner However, FGF-9 was found to be secreted efficiently from cDNA-transfected COS cells despite its lack of a typical signal sequence It could be detected exclusively in the culture medium of cells The secreted protein lacked no ammo acid residues at the N terminus with respect to those predicted by the cDNA sequence, except the initiation methiomne The rat FGF-9 cDNA was also cloned, and the structural analysis indicated that the FGF-9 gene is highlv conserved The present invention provides a novel human FGF as well as its corresponding cDNA The protein product of this gene has been shown to exhibit growth stimulatory and oncogemc properties Furthermore, overexpression of the FGF mRNA was noted in certain specific cancer cell lines These observations suggest that the novel FGF may be of use by serving as an excellent target in the treatment of human malignancy The invention also includes mature FGF-CX polypeptides, vanants of mature FGF-CX polypeptides, fragments of mature and mature vanant FGF-CX polypeptides, and nucleic acids encoding these polypeptides and fragments As used herein, a "mature" form of a FGF-CX polypeptide or protein disclosed in the present invention is the product of a naturally occumng polypeptide or precursor form or proprotem The naturally occumng polypeptide, precursor or proprotem includes, by way of nonlimitmg example, the full length gene product, encoded by the corresponding gene In some embodiments, the mature form include an FGF-CX polypeptide, precursor or proprotem encoded by an open reading frame descnbed herein The product 'mature" form can arise, e g , as a result of one or more naturally occumng processing steps as they may take place withm the cell, or host cell, in which the gene product anses Examples of such processing steps leading to a "mature" form of a polypeptide or protein include the cleavage of the N-terminal methiomne residue encoded by the initiation codon of an open reading frame, or the proteolytic cleavage of a signal peptide or leader sequence Thus a mature form arising from an FGF-CX precursor polypeptide or protein that has residues 1 to N, where residue 1 is the N-termmal methiomne, would have residues 2 through N remaining after removal of the N-termmal methiomne Alternatively, a mature form ansing from a precursor polypeptide or protein having residues 1 to N, in which an N- terminal signal sequence from residue 1 to residue M is cleaved, would have the residues from residue M+l to residue N remaining Additionally, a "mature" protein or fragment may anse from a cleavage event other than removal of an initiating methiomne or removal of a signal peptide Further as used herein, a "mature" form of an FGF-CX polypeptide or protein may anse from a step of post-translational modification other than a proteolytic cleavage event. Such additional processes include, by way of non- limiting example, glycosylation, mynstoylation or phosphorylation In general, a mature polypeptide or protein may result from the operation of only one of these processes, or a combination of any of them. As used herein, "identical" residues conespond to those residues m a companson between two sequences vv here the equivalent nucleotide base or ammo acid residue in an alignment of two sequences is the same residue Residues are alternatively descnbed as "similar" or "positive" w hen the compansons between two sequences m an alignment show that residues in an equivalent position in a companson are either the same amino acid or a conserved ammo acid as defined below Included withm the invention are FGF-CX nucleic acids, isolated nucleic acids that encode FGF-CX polypeptide or a portion thereof, FGF-CX polypeptides. vectors containing these nucleic acids, host cells transformed with the FGF-CX nucleic acids, anti-FGF-CX antibodies, and pharmaceutical compositions Also disclosed are methods of making FGF-CX polypeptides, as well as methods of screening, diagnosing, treating conditions using these compounds, and methods of screening compounds that modulate FGF-CX polypeptide activity Table 1 below delineates the sequence descnptors that are used throughout the invention TABLE 1 SEQ ID NO SEQUENCE DESCRIPTOR 1 Human FGF-CX nucleotide sequence 2 Human FGF-CX polypeptide sequence 3 FGF-CX Forward pnmer 4 FGF-CX Reverse pnmer 5 Gha Activating Factor (GAF) 6 Human genomic fragment - bp 15927-16214 7 Human genomic fragment - bp 7257-751 1 8 Human genomic fragment - bp 9837-9942 9 Human FGF-9 10 Mouse FGF-9 11 Rat FGF-9 12 Xenopus FGF-CX 13 Human FGF-CX hydrophobic domain (aa 90-1 15) 14 PSec-V5-Hιs Forward 15 PSec-V5-Hιs Reverse 16 PSETA linker 17 PSETA linker 18 TaqMan expression analysis forward primer 19 TaqMan expression analysis reverse primer 20 TaqMan expression analysis probe The FGF-CX nucleic acids and polypeptides, as well as FGF-CX antibodies, therapeutic agents and pharmaceutical compositions discussed herein, are useful, inter aha, m treating tissue proliferation-associated disorders These tissue proliferation-associated disorders can include disorders affecting epithelial cells, e g , fibroblasts and keratinocytes in the antenor eye after surgery Other tissue proliferation-associated disorder include, e g , tumors, restenosis, psonasis, Dupuytren's contracture, diabetic complications, Kaposi sarcoma, and rheumatoid arthntis Included in the invention is a nucleotide sequence (SEQ ID NO 1) encoding a novel fibroblast growth factor designated fibroblast growth factor-20X (FGF-CX ) (see FIG 1 , SEQ ID NO 1) This coding sequence was identified in human genomic DNA sequences The disclosed DNA sequence has 633 bases that encode a polypeptide predicted to have 211 ammo acid residues (SEQ ID NO 2) The predicted molecular weight of FGF-CX, based on the sequence shown in FIG 1 and SEQ ID NO 2, is 23498 4 Da The FGF-CX nucleic acid sequence was used as a query nucleotide sequence in a BLASTN search to identify related nucleic acid sequences The FGF-CX nucleotide sequence has a high similanty to muπne fibroblast growth factor 9 (FGF-9) (392 of 543 bases identical, or 72%, GenBank Accession Number S82023) and to human DNA encoding gha activating factor (GAP) (385 of 554 bases identical, or 69%o, GenBank Accession Number E05822, also termed FGF-9) In addition. FGF-CX was found to have a comparable degree of identity (311 of 424 bases identical, or 73%) to a GAF sequence (SEQ ID NO 5) disclosed by Naruo et al in Japanese Patent JP 1993301893 (see FIG 2) The complementary strand of FGF-CX also has regions of similanty to a cloned genomic DNA fragment of 100 kilobasepairs (kbp) (GenBank accession number AB020858) located in a segment of chromosome 8p21 3 - 8p22 As shown in FIG 3 A, bases 1 to 289 of the reverse strand of SEQ ID NO 1 have 288 of 289 bp (99%) both identical and positive to bases 15927 to 16214 of the GenBank genomic fragment (SEQ ID NO 6) As shown m FIG 3B, bases 380 to 633 of the rev erse strand of SEQ ID NO 1 have 250 of 255 bp (98%) both identical and positive to bases 7257 to 7511 of the GenBank genomic fragment (SEQ ID NO 7) As shown in FIG 3C, bases 286 to 391 of the reverse strand of SEQ ID NO 1 have 106 of 106 bp (100%) both identical and positive to bases 9837 to 9942 of the GenBank genomic fragment (SEQ ID NO 8) BLASTN scores were 1430 (214 6 bits), 1224 (183 6 bits) and 530 (79 5 bits) for FIG 3A, FIG 3B and FIG 3C, respectively Expect values and Sum P(3) values for all three BLASTN compansons were 1 6e-126 To venfy that the open reading frame (ORF) identified by genomic mining was correct, PCR amplification was used to obtain a cDNA corresponding to the predicted genomic clone The nucleotide sequence of the obtained product precisely matches that of the predicted gene (see Example 1) The protein encoded by the cDNA is most closely related to Xenopus FGF-20X (designated XFGF-CX or XFGF-20X herein), as well as to human FGF-9 and human FGF-16 (80%, 70% and 64% ammo acid identity, respectively, see FIGs 4 and 5) Based on the strong homology with XFGF-CX. the gene identified in the present disclosure is believed to represent its human ortholog, and is named FGF-CX herein A BLASTP alignment of the first 208 amino acids of the FGF-CX polypeptide sequence (SEQ ID NO 2) with a human FGF-9 (SEQ ID NO 9) is shown in FIG 6 FGF-9 is disclosed as SWISSPROT Accession Number P31371 for Gha-Activatmg Factor Precursor (GAF) (Fibroblast Growth Factor-9) See, e g , Miyamoto et al 1993 Mol Cell Biol 13 4251-4259, Naruo et al 1993 J Biol Chem 268 2857-2864 BLASTX alignments of the first 208 ammo acids of the predicted FGF-CX polypeptide (SEQ ID NO 2, translated from SEQ ID NO 1 ) with the mouse FGF-9 (SEQ ID NO 10) and rat FGF-9 (SEQ ID NO 11) sequences are shown in FIGs 7 and 8, respectively See, SWISSPROT Accession Number P54130 for Gha- Activating Factor Precursor (GAF) (Fibroblast Growth Factor-9), Santos- Ocampo et al . 1996 J Biol Chem 271 1726-1731, for mouse FGF-9, and SWISSPROT accession Number P36364 G a- Activating Factor Precursor (GAF) (Fibroblast Growth Factor-9) (FGF-9), Miyamoto. 1993 Mol Cell Biol 13 4251-4259, for rat FGF-9 As indicated by the bars ("|") in FIGs 5-7, FGF-9 sequences of all three species have 147 of 208 residues identical with FGF-CX (SEQ ID NO 2), for an overall sequence identity of 70% In addition, 170 of 208 residues are positive to the sequence of FGF-CX (SEQ ID NO 2), for an overall percentage of positive residues of 81% Positive residues include those residues that are either identical ("|") or have a conservative amino acid substitution ("+") in the same relative position of the compared sequences when aligned, see below The full length FGF-CX polypeptide (SEQ ID NO 2) was also aligned by BLASTX with Xenopus XFGF-CX (SEQ ID NO 12) As shown in FIG 9. FGF-CX has 170 of 211 (80%) identical residues, and 189 of 211 (89%) positive residues compared with Xenopus XFGF-CX Xenopus XFGF-CX was obtained recently from a cDNA library prepared at the tailbud stage using the product of degenerate PCR performed with pnmers based on mammalian FGF-9s as a probe See, Koga et al , 1999 Biochem Biophys Res Commun 261 756-765 The deduced 208 amino acid sequence of the XFGF-CX open reading frame contains a motif charactenstic of the FGF family XFGF-CX has a 73 1% overall similanty to XFGF-9 but differs from XFGF-9 m its amino-terminal region (33 3% similanty) This resembles the similanty seen for the presently disclosed SEQ ID NO 2 with respect to vanous mammalian FGF-9 and FGF-16 sequences, including human (see above) See, FIGs 4, 5 and 7-9 The polypeptide sequence in FIG 1 (SEQ ID NO 2) is predicted by the program PSORT to have high probabilities for sorting through the membrane of the endoplasmic reticulum and of the microbody (peroxisome) In addition, although it does not have a predicted cleavable signal sequence at its N-termmus. the hydropathy plot in FIG 10 shows that FGF-CX has a prominent hydrophobic segment at ammo acid positions about 90 to about 115 (SEQ ID NO 13) This single hydrophobic region is known to be a sorting signal m other members of the FGF family Accordingly, a polypeptide that includes the amino acids of SEQ ID NO 13 is useful as a sorting signal, allowing secretion through vanous cellular membranes, such as the endoplasmic reticulum, the Golgi membrane or the plasma membrane FGF-CX lacks a classical amino-termmal signal sequence as predicted by PSORT (Nakai et al , 1992 Genomics 14, 897-91 1) and SIGNALP (Nielsen et al , 1997 Protein Eng 10 1-6) computer algonthms, just as found for some of its closest human family members (e g FGF-9 and FGF-16) Nonetheless, both FGF-9 and FGF-16 are secreted See, e g , Matsumoto-Yoshitomi et al 1997 hit J Cancer 71 442-450, Miyake et al 1998 Biochem Bioplns Res Comm 243 148-152, Miyakawa er α/ 1999 J Biol Chem 274 29352-29357, Revest et al 2000 J Biol Chem 275, 8083-8090 To determine whether FGF-CX is also secreted, the cDNA encoding the full length FGF-CX protein was subcloned into a mammalian expression vector designated pFGF-CX The protein expressed when human embryonic kidney 293 cells are transfected with this v ector is found m the conditioned medium, and exhibits a band detected by an antibody to a C-terminal V5 epitope, with an apparent molecular weight m a Western blot of approximately 27 kDa (FIG 11, Example 7) An additional portion of the expressed protein is released from sequestration on the 293 cells by treatment with a substance that inhibits interaction with hepann sulfate proteoglycan (HSPG) The protein released in this way also exhibits a similar Western blot pattern (FIG 1 1) Similarly when the protein is expressed in HEK293 cells from a recombinant plasmid incorporating an Ig Kappa signal sequence, a band is detected by Western blot with an apparent molecular weight of approximately 34 kDa (FIG 12, Example 5) ClustalW multiple protein alignments (Thompson ef al 1994 Nucl Acids Res 22: 4673-4680) for several v ertebrate FGF- ke proteins, including the FGF-CX of the present invention, are shown m FIGs 4 and 5 The three mammalian proteins (SEQ ID NOs 9-11) resemble each other verv closely but differ considerably from the FGF-CX protein of the present invention (SEQ ID NO 2) Also, the Xenopus XFGF-CX (SEQ ID NO 12) and the sequence of SEQ ID NO 2 resemble each other more closely than those of FGF-9 The internal hydrophobic domain involved in FGF-9 secretion spans residues 95-120 of the FGF-9 sequence See, e g , Mivakawa et αl 1999 J Biol Chem 274 29352-29357 FIG 10 depicts a hv dropathv plot ot FGF-CX The expression of XFGF-20 and of Xenopus FGF-9 are distinct from each other XFGF-20 mRNA is expressed in diploid cells, in embryos at and after the blastula stage, and specifically in the stomach and testis of adults, whereas XFGF-9 mRNA is expressed maternally in eggs and in many adult tissues See, e g , Koga et αl , above Correct expression of XFGF-20 during gastrulation appears to be required for the formation of normal head structures in Xenopus laevis When XFGF-20 mRNA was overexpressed in early embryos, gastrulation was abnormal and development of antenor structures was suppressed See, Koga et αl . above In such embryos, expression of the Xbrα transcnpt, among those tested, was suppressed dunng gastrulation, indicating that expression of the Xbrα gene mediates XFGF- CX effects See. e g . Koga et αl . above The expression patterns of the related XFGF-9 polypeptide m proliferating tissues, (including, e g ova testis, stomach, and multiple tissues m the maternal frog), suggests a role for XFGF-20 m the maintenance of tissues that normally undergo regeneration m a functioning organism It is shown m Example 8 that FGF-CX mRNA is expressed in normal cerebellum, as well as in several human tumor cell lines including carcinomas of the lung, stomach and colon but not in the corresponding normal tissues The lack of FGF-CX expression m normal lung, stomach and colon, and its presence in tumor lines from these tissues, indicates that these cancer cell lmes apparently overexpress FGF-CX in an mappropnate fashion The chromosomal region to which FGF-CX maps is commonly altered in colorectal, lung and gastnc carcinomas See, e g , Emi ef al 1992 Cancer Res 52: 5368-5372, Baffa ef al 2000 Clin Cancer Res 6:1372-1377 It is possible that the establishment of an FGF-CX-dnven autocnne growth loop m these cells contnbutes to their initial tumongenic conversion and/or to their subsequent expansion This scenano is supported by the finding that the generation of an FGF-CX-dnven autocnne loop in NIH 3T3 cells activates their tumongenic potential (see Example 11) It is also possible that FGF-CX secretion by tumor cells stimulates their in vivo growth via paracnne effects on stromal cells Expression of heterologous FGF-CX in NIH 3T3 cells is found to induce their transformation and tumongemcity (see Example 1 1 ) These effects are mediated by both native FGF-CX (construct pFGF-CX) and FGF-CX expressed with a heterologous Igκ signal sequence at its ammo-terminus (construct pIgκ-FGF-CX) However, it should be noted that pIgκ-FGF-CX is more oncogenically active than pFGF-CX. as evidenced by its greater in vitro transforming ability (data not shown) and in vivo tumongemcity (FIG 19) The supenor oncogemcity of pIgκ-FGF-CX relative to pFGF-CX is likely due to the fact that pIgκ-FGF-CX produces significantly more secreted FGF-CX protein than does pFGF-CX m NIH 3T3 cells (FIG. 11B). Like FGF-CX, other FGFs have been shown to transform cells following ectopic expression, and m some cases the blockade of FGF signaling has been shown to suppress cell transformation See, e.g , Matsumoto-Yoshitomi ef al 1997 Int J Cancer 71 - 442-450, Li ef a/. 1994 Mol Cell Biol 14 7660-7669 Based on the properties of FGF-CX descnbed herein, as well as on the similanties with the effects found for related FGF proteins, it is believed that FGF-CX plays an important role in human malignancy For these reasons, the FGF-CX polypeptides. nucleic acids and antibodies disclosed herein are useful in methods of diagnosing the presence or amounts of these compositions, in screening for and identifying therapeutic agents related to FGF-CX- associated pathologies, and in methods of treatment of vanous kinds of malignancy FGF-CX Nucleic Acids The nucleic acids of the invention include those that encode a FGF-CX or FGF-CX- hke protein Among these nucleic acids is the nucleic acid whose sequence is provided in FIG 1 and SEQ ID NO 1 , or a fragment thereof The FGF-CX nucleic acid can have the nucleotide sequence of a genomic FGF-CX nucleic acid, or of a cDNA Additionally, the invention includes mutant or \ aπant nucleic acids of SEQ ID NO 1 , or a fragment thereof, any of whose bases may be changed from the corresponding base shown in FIG. 1 while still encoding a protein that maintains its FGF-CX -like activities and physiological functions The invention further includes the complement of the nucleic acid sequence of SEQ ID NOT, including fragments, denvatives, analogs and homolog thereof Examples of the complementary strand of portions of FGF-CX are shown in FIG 3 A, FIG. 3B and FIG. 3C The invention additionally includes nucleic acids or nucleic acid fragments, or complements thereto, whose structures include chemical modifications One aspect of the invention pertains to isolated nucleic acid molecules that encode FGF-CX proteins or biologically active portions thereof Also included are nucleic acid fragments sufficient for use as hybndization probes to identify FGF-CX-encoding nucleic acids (e g , FGF-CX mRNA) and fragments for use as polymerase chain reaction (PCR) pnmers for the amplification or mutation of FGF-CX nucleic acid molecules. As used herein, the term "nucleic acid molecule" is intended to include DNA molecules (e g , cDNA or genomic DNA), RNA molecules (e g . mRNA), analogs of the DNA or RNA generated using nucleotide analogs, and denvatives. fragments and homologs thereof The nucleic acid molecule can be single-stranded or double-stranded, but preferably is double-stranded DNA. "Probes" refer to nucleic acid sequences of vanable length, preferably between at least about 10 nucleotides (nt), 100 nt. or as many as about, e g . 6,000 nt, depending on use. Probes are used in the detection of identical, similar, or complementary nucleic acid sequences Longer length probes are usually obtained from a natural or recombinant source, are highly specific and much slower to hybndize than ohgomers Probes may be single- or double-stranded and designed to have specificity m PCR, membrane-based hybridization technologies, or ELISA-hke technologies An "isolated" nucleic acid molecule is one that is separated from other nucleic acid molecules that are present in the natural source of the nucleic acid. Examples of isolated nucleic acid molecules include, but are not limited to. recombinant DNA molecules contained in a vector, recombinant DNA molecules maintained in a heterologous host cell, partially or substantially punfied nucleic acid molecules, and synthetic DNA or RNA molecules. Preferably, an "isolated" nucleic acid is free of sequences which naturally flank the nucleic acid (i e , sequences located at the 5' and 3' ends of the nucleic acid) in the genomic DNA of the organism from which the nucleic acid is denved For example, in vanous embodiments, the isolated FGF-CX nucleic acid molecule can contain less than about 50 kb, 25 kb, 5 kb, 4 kb, 3 kb, 2 kb, 1 kb, 0.5 kb or 0 1 kb of nucleotide sequences which naturally flank the nucleic acid molecule in genomic DNA of the cell from which the nucleic acid is denved. Moreover, an "isolated" nucleic acid molecule, such as a cDNA molecule, can be substantially free of other cellular matenal or culture medium when produced by recombinant techniques, or of chemical precursors or other chemicals when chemically synthesized A nucleic acid molecule of the present invention, e g , a nucleic acid molecule having the nucleotide sequence of SEQ ID NO 1 , or a complement of any of this nucleotide sequence, can be isolated using standard molecular biology techniques and the sequence information provided herein Using all or a portion of the nucleic acid sequence of SEQ ID NO 1 as a hybndization probe, FGF-CX nucleic acid sequences can be isolated using standard hybndization and cloning techniques (e g , as descnbed in Sambrook et al , eds , MOLECULAR CLONING A LABORATORY MANLAL 2 nd Ed , Cold Spnng Harbor Laboratory Press, Cold Spnng Harbor, NY, 1989, and Ausubel, et al , eds , CURRENT PROTOCOLS IN MOLECULAR BIOLOGY, John Wiley & Sons, New York, NY, 1993 ) A nucleic acid of the invention can be amplified using cDNA, mRNA or alternatively, genomic DNA, as a template and appropnate ohgonucleotide pnmers according to standard PCR amplification techniques The nucleic acid so amplified can be cloned into an appropnate vector and charactenzed by DNA sequence analysis Furthermore, oligonucleotides corresponding to FGF-CX nucleotide sequences can be prepared by standard synthetic techniques, e g , using an automated DNA synthesizer As used herein, the term "ohgonucleotide" refers to a senes of linked nucleotide residues, which ohgonucleotide has a sufficient number of nucleotide bases to be used in a PCR reaction A short ohgonucleotide sequence may be based on, or designed from, a genomic or cDNA sequence and is used to amplify, confirm, or reveal the presence of an identical, similar or complementary DNA or RNA in a particular cell or tissue Oligonucleotides compnse portions of a nucleic acid sequence having about 10 nt, 50 nt, or 100 nt in length, preferably about 15 nt to 30 nt m length In one embodiment, an ohgonucleotide composing a nucleic acid molecule less than 100 nt m length would further compnse at lease 6 contiguous nucleotides of SEQ ID NO 1, or a complement thereof Oligonucleotides may be chemically synthesized and may be used as probes In another embodiment, an isolated nucleic acid molecule of the invention compnses a nucleic acid molecule that is a complement of the nucleotide sequence shown in SEQ ID NO 1 In another embodiment, an isolated nucleic acid molecule of the invention compnses a nucleic acid molecule that is a complement of the nucleotide sequence shown m SEQ ID NO 1, or a portion of this nucleotide sequence A nucleic acid molecule that is complementary to the nucleotide sequence shown m SEQ ID NO 1 is one that is sufficiently complementary to the nucleotide sequence shown in SEQ ID NO 1 that it can hydrogen bond with little or no mismatches to the nucleotide sequence shown m SEQ ID NO 1, thereby forming a stable duplex As used herein, the term "complementary" refers to Watson-Cnck or Hoogsteen base pamng between nucleotides units of a nucleic acid molecule, and the term "binding" means the physical or chemical interaction between two polypeptides or compounds or associated polypeptides or compounds or combinations thereof Binding includes ionic, non-ionic, van der Waals, hydrophobic interactions, etc A physical interaction can be either direct or indirect Indirect interactions may be through or due to the effects of another polypeptide or compound Direct binding refers to interactions that do not take place through, or due to, the effect of another polypeptide or compound, but instead are without other substantial chemical intermediates Moreover, the nucleic acid molecule of the invention can compnse only a portion of the nucleic acid sequence of SEQ ID NO 1, e g , a fragment that can be used as a probe or pnmer, or a fragment encoding a biologically active portion of FGF-CX Fragments provided herein are defined as sequences of at least 6 (contiguous) nucleic acids or at least 4 (contiguous) amino acids, a length sufficient to allow for specific hybndization in the case of nucleic acids or for specific recognition of an epitope in the case of ammo acids, respectively, and are at most some portion less than a full length sequence Fragments may be denved from any contiguous portion of a nucleic acid or amino acid sequence of choice Denvatives are nucleic acid sequences or ammo acid sequences formed from the native compounds either directly or by modification or partial substitution Analogs are nucleic acid sequences or amino acid sequences that have a structure similar to, but not identical to, the native compound but differs from it in respect to certain components or side chains Analogs may be synthetic or from a different evolutionary origin and may have a similar or opposite metabolic activity compared to wild type Denvatives and analogs may be full length or other than full length, if the denvative or analog contains a modified nucleic acid or amino acid, as descnbed below Denvatives or analogs of the nucleic acids or proteins of the invention include, but are not limited to, molecules composing regions that are substantially homologous to the nucleic acids or proteins of the invention, in vanous embodiments, by at least about 70%, 80%, 85%, 90%, 95%, 98%, or even 99% identity (with a preferred identity of 80-99%) over a nucleic acid or ammo acid sequence of identical size or when compared to an aligned sequence in which the alignment is done by a computer homology program known in the art, or whose encoding nucleic acid is capable of hvbndizmg to the complement of a sequence encoding the aforementioned proteins under stnngent, moderately stnngent, or low stnngent conditions See e g Ausubel, et al , CLRRENT PROTOCOLS IN MOLECULAR BIOLOGY, John Wiley & Sons, New York, NY, 1993, and below An exemplary program is the Gap program (Wisconsin Sequence Analysis Package, \ ersion 8 for UNIX, Genetics Computer Group, University Research Park. Madison. WI) using the default settings, which uses the algonthm of Smith and Waterman (Adv Appl Math , 1981, 2 482-489, which is incorporated herein by reference m its entirety) A "homologous nucleic acid sequence" or "homologous ammo acid sequence," or vanations thereof, refer to sequences charactenzed by a homology at the nucleotide level or ammo acid level as discussed above Homologous nucleotide sequences encode those sequences coding for lsoforms of FGF-CX polypeptide Isoforms can be expressed m different tissues of the same organism as a result of, for example, alternative splicing of RNA Alternatively, isoforms can be encoded by different genes In the present invention, homologous nucleotide sequences include nucleotide sequences encoding for a FGF-CX polypeptide of species other than humans, including, but not limited to, mammals, and thus can include, e g , mouse, rat, rabbit, dog, cat cow, horse, and other organisms Homologous nucleotide sequences also include, but are not limited to, naturally occumng allehc vanations and mutations of the nucleotide sequences set forth herein A homologous nucleotide sequence does not, however, include the nucleotide sequence encoding human FGF-CX protein Homologous nucleic acid sequences include those nucleic acid sequences that encode conservative ammo acid substitutions (see below) in SEQ ID NO 2. as well as a polypeptide having FGF-CX activity Biological activities of the FGF-CX proteins are descnbed below A homologous ammo acid sequence does not encode the ammo acid sequence of a human FGF-CX polypeptide The nucleotide sequence determined from the cloning of the human FGF-CX gene allows for the generation of probes and primers designed for use m identifying and/or cloning FGF-CX homologues in other cell types, e g , from other tissues, as well as FGF-CX homologues from other mammals The probe/pnmer typically composes a substantially puofied ohgonucleotide The ohgonucleotide typically composes a region of nucleotide sequence that hybndizes under stnngent conditions to at least about 12, 25. 50, 100, 150, 200, 250, 300, 350 or 400 or more consecutive sense strand nucleotide sequence of SEQ ID NO 1 , or an anti-sense strand nucleotide sequence of SEQ ID NO 1 , or of a naturally occumng mutant of SEQ ID NO 1 Probes based on the human FGF-CX nucleotide sequence can be used to detect transcnpts or genomic sequences encoding the same or homologous proteins In vanous embodiments, the probe further composes a label group attached thereto, e g , the label group can be a radioisotope, a fluorescent compound, an enzyme, or an enzyme co-factor Such probes can be used as a part of a diagnostic test kit for identifying cells or tissue which misexpress a FGF-CX protein, such as by measuong a level of a FGF-CX-encodmg nucleic acid in a sample of cells from a subject e g , detecting FGF-CX mRNA levels or determining whether a genomic FGF-CX gene has been mutated or deleted "A polypeptide having a biologically active portion of FGF-CX" refers to polypeptides exhibiting activity similar, but not necessaoly identical to, an activity of a polypeptide of the present invention, including mature forms, as measured in a particular biological assay, with or without dose dependency A nucleic acid fragment encoding a "biologically active portion of FGF-CX" can be prepared by isolating a portion of SEQ ID NO 1 , that encodes a polypeptide having a FGF-CX biological activity (biological activities of the FGF-CX proteins are descobed below), expressing the encoded portion of FGF-CX protein (e g , by recombinant expression in vitro) and assessing the activity of the encoded portion of FGF-CX For example, a nucleic acid fragment encoding a biologically active portion of FGF-CX can optionally include an ATP-bindmg domain In another embodiment, a nucleic acid fragment encoding a biologically active portion of FGF-CX includes one or more regions as described below FGF-CX variants The invention further encompasses nucleic acid molecules that differ from the nucleotide sequences shown m FIG 1 due to degeneracy of the genetic code These nucleic acids thus encode the same FGF-CX protein as that encoded by the nucleotide sequence shown m SEQ ID NO 1 In another embodiment, an isolated nucleic acid molecule of the invention has a nucleotide sequence encoding a protein having an ammo acid sequence shown m SEQ ID NO 2 In addition to the human FGF-CX nucleotide sequence shown m SEQ ID NO 1. it will be appreciated by those skilled in the art that DNA sequence polymorphisms that lead to changes in the ammo acid sequences of FGF-CX may exist withm a population (e g , the human population) Such genetic polymorphism m the FGF-CX gene may exist among individuals within a population due to natural allehc vanation As used herein, the terms "gene" and "recombinant gene" refer to nucleic acid molecules composing an open reading frame encoding a FGF-CX protein, preferably a mammalian FGF-CX protein Such natural allehc vaoations can typically result in 1-5% vaoance in the nucleotide sequence of the FGF- CX gene Any and all such nucleotide vaoations and resulting ammo acid polymorphisms m FGF-CX that are the result of natural allehc vaoation and that do not alter the functional activity of FGF-CX are intended to be withm the scope of the invention Moreover, nucleic acid molecules encoding FGF-CX proteins from other species, and thus that have a nucleotide sequence that differs from the human sequence of SEQ ID NO 1, are intended to be within the scope of the invention Nucleic acid molecules corresponding to natural allehc vaoants and homologues of the FGF-CX cDNAs of the invention can be isolated based on their homology to the human FGF-CX nucleic acids disclosed herein using the human cDNAs, or a portion thereof, as a hvbodization probe according to standard hybodization techniques under stongent hvbodization conditions For example, a soluble human FGF-CX cDNA can be isolated based on its homology to human membrane-bound FGF-CX Likewise, a membrane-bound human FGF-CX cDNA can be isolated based on its homology to soluble human FGF-CX Accordingly, in another embodiment, an isolated nucleic acid molecule of the invention is at least 6 nucleotides in length and hybodizes under stnngent conditions to the nucleic acid molecule composing the nucleotide sequence of SEQ ID NO 1 In another embodiment, the nucleic acid is at least 10, 25, 50. 100. 250, 500 or 750 nucleotides in length In another embodiment, an isolated nucleic acid molecule of the invention hybodizes to the coding region As used herein, the term "hybndizes under stnngent conditions" is intended to describe conditions for hybridization and washing under which nucleotide sequences at least 60% homologous to each other typically remain hybndized to each other Homologs (i e , nucleic acids encoding FGF-CX proteins deoved from species other than human) or other related sequences (e g , paralogs) can be obtained by low, moderate or high stringency hvbodization with all or a portion of the particular human sequence as a probe using methods well known in the art for nucleic acid hybodization and cloning As used herein, the phrase "stongent hybodization conditions" refers to conditions under which a probe, primer or ohgonucleotide will hybodize to its target sequence, but to no other sequences Stongent conditions are sequence-dependent and will be different m different circumstances Longer sequences hybodize specifically at higher temperatures than shorter sequences Generally, stongent conditions are selected to be about 5°C lower than the thermal melting point (Tm) for the specific sequence at a defined ionic strength and pH The Tm is the temperature (under defined ionic strength, pH and nucleic acid concentration) at which 50% of the probes complementary to the target sequence hybodize to the target sequence at equihboum Since the target sequences are generally present at excess, at Tm, 50% of the probes are occupied at equihboum Typically, stongent conditions will be those in which the salt concentration is less than about 1 0 M sodium ion, typically about 0 01 to 1 0 M sodium ion (or other salts) at pH 7 0 to 8 3 and the temperature is at least about 30°C for short probes, pomers or oligonucleotides (e g , 10 nt to 50 nt) and at least about 60°C for longer probes, pomers and oligonucleotides Stringent conditions may also be achieved with the addition of destabilizing agents, such as formamide Stongent conditions such as descobed above are known to those skilled in the art and can be found in CURRENT PROTOCOLS IN MOLECULAR BIOLOGY, John Wiley & Sons, N Y (1989), 6 3 1-6 3 6 Preferably, the conditions are such that sequences at least about 65%, 70%, 75%, 85%, 90%, 95%, 98%, or 99% homologous to each other typically remain hybodized to each other A non-hmitmg example of stongent hybodization conditions is hybodization in a high salt buffer composing 6X SSC, 50 mM Tos-HCl (pH 7 5). 1 mM EDTA, 0 02% PVP, 0 02% Ficoll, 0 02% BSA, and 500 mg/ml denatured salmon sperm DNA at 65°C This hybodization is followed by one or more washes in 0 2X SSC, 0 01% BSA at 50°C An isolated nucleic acid molecule of the invention that hybodizes under stnngent conditions to the sequence of SEQ ID NO 1 corresponds to a naturally occumng nucleic acid molecule As used herein, a "naturally-occurring" nucleic acid molecule refers to an RNA or DNA molecule having a nucleotide sequence that occurs in nature (e g , encodes a natural protein) Homologs (ι e nucleic acids encoding FGF-CX proteins deoved from species other than human) or other related sequences (e g , paralogs) can be obtained by low, moderate or high stongencv hybodization with all or a portion of the particular human sequence as a probe using methods well known in the art for nucleic acid hybodization and cloning In a second embodiment, a nucleic acid sequence that is hybodizable to the nucleic acid molecule composing the nucleotide sequence of SEQ ID NO 1, or fragments, analogs or deovatives thereof, under conditions of moderate stongency is provided A non-hmitmg example of moderate stongency hybodization conditions are hybodization m 6X SSC, 5X Denhardt's solution, 0 5% SDS and 100 mg/ml denatured salmon sperm DNA at 55°C, followed by one or more washes in IX SSC, 0 1% SDS at 37°C Other conditions of moderate stongency that may be used are well known m the art See. e g , Ausubel et al (eds.), 1993, CURRENT PROTOCOLS IN MOLECULAR BIOLOGY, John Wiley & Sons. NY, and Koegler, 1990, GENE TRANSFER AND EXPRESSION, A LABORATORY MANUAL, Stockton Press, NY In a third embodiment, a nucleic acid that is hybodizable to the nucleic acid molecule composing the nucleotide sequence of SEQ ID NO 1, or fragments, analogs or deovatives thereof, under conditions of low stongency, is provided A non-hmitmg example of low stongency hybodization conditions are hybodization in 35% formamide, 5X SSC, 50 mM Tπs-HCl (pH 7 5), 5 mM EDTA, 0 02% PVP, 0 02% Ficoll, 0 2% BSA, 100 mg/ml denatured salmon sperm DNA, 10% (wt/ ol) dextran sulfate at 40°C, followed by one or more washes in 2X SSC, 25 mM Tns-HCl (pH 7 4), 5 mM EDTA, and 0 1% SDS at 50°C Other conditions of low stongency that may be used are well known in the art (e g , as employed for cross-species hybndizations) See, e g , Ausubel et al (eds ), 1993, CURRENT PROTOCOLS IN MOLECULAR BIOLOG , John W τ ιley & Sons, NY, and Koegler, 1990, GENE TRANSFER AND EXPRESSION, A LABORATORY MANUAL, Stockton Press, NY, Shilo and Weinberg, 1981, Proc Natl Acad Sci USA 78 6789-6792 Conservative mutations In addition to naturally-occurong allehc vaoants of the FGF-CX sequence that may exist in the population, the skilled artisan will further appreciate that changes can be introduced by mutation into the nucleotide sequence of SEQ ID NO 1 , thereby leading to changes m the ammo acid sequence of the encoded FGF-CX protein, without altenng the functional ability of the FGF-CX protein For example, nucleotide substitutions leading to amino acid substitutions at "non-essential" ammo acid residues can be made in the sequence of SEQ ID NO 1 A "non-essential" ammo acid residue is a residue that can be altered from the wild-type sequence of FGF-CX without altenng the biological activity, whereas an "essential" ammo acid residue is required for biological activity For example, amino acid residues that are conserved among the FGF-CX proteins of the present invention, are predicted to be particularly unamenable to alteration In addition, ammo acid residues that are conserved among FGF family members, as indicated by the alignment presented as FIG 4, are predicted to be less amenable to alteration For example, FGF-CX proteins of the present invention can contain at least one domain that is a typically conserved region m FGF family members, i e , FGF-9 and XFGF-CX proteins, and FGF-CX homologs As such, these conserved domains are not likely to be amenable to mutation. Other amino acid residues, ho ever, (e g , those that are not conserved or only semi-conserved among members of the FGF proteins) may not be as essential for activity and thus are more likely to be amenable to alteration Another aspect of the invention pertains to nucleic acid molecules encoding FGF-CX proteins that contain changes in ammo acid residues that are not essential for activity Such FGF-CX proteins differ in amino acid sequence from SEQ ID NO.2, yet retain biological activity In one embodiment, the isolated nucleic acid molecule composes a nucleotide sequence encoding a protein, wherem the protein composes an amino acid sequence at least about 75% homologous to the ammo acid sequence of SEQ ID NO.2 Preferably, the protein encoded by the nucleic acid is at least about 80% homologous to SEQ ID NO.2, more preferably at least about 90%. 95%. 98%. and most preferably at least about 99% homologous to SEQ ID NO 2 An isolated nucleic acid molecule encoding a FGF-CX protein homologous to the protein of SEQ ID NO 2 can be created by introducing one or more nucleotide substitutions, additions or deletions into the nucleotide sequence of SEQ ID NO 1. such that one or more amino acid substitutions, additions or deletions are introduced into the encoded protein. Mutations can be introduced into SEQ ID NO:l by standard techniques, such as site-directed mutagenesis and PCR-mediated mutagenesis Preferably, conservative ammo acid substitutions are made at one or more predicted non-essential amino acid residues. A "conservative amino acid substitution" is one in which the ammo acid residue is replaced with an ammo acid residue having a similar side chain Families of amino acid residues having similar side chains have been defined in the art. Certain ammo acids have side chains with more than one classifiable characteostic These families include amino acids with basic side chains (e g , lysine, argmme. histidine), acidic side chains (e g , aspartic acid, glutamic acid), uncharged polar side chains (e g , glycme. asparagme, glutamine, seone, threomne, tyrosine, tryptophan, cysteine), nonpolar side chains (e g . alanine, valme, leucine, isoleucine, proline, phenylalanine, methiomne, tyrosine, tryptophan), beta-branched side chains (e g , threomne, valine, isoleucine) and aromatic side chains (e.g , tyrosine. phenylalanine, tryptophan, histidine) Thus, a predicted nonessential amino acid residue in a growth factor is replaced with another ammo acid residue from the same side chain family Alternatively, in another embodiment, mutations can be introduced randomly along all or part of a growth factor coding sequence, such as by saturation mutagenesis. and the resultant mutants can be screened for growth factor biological activity to identify mutants that retain activity Following mutagenesis of SEQ ID NOS 1 and 3 the encoded protein can be expressed by any recombinant technology known in the art and the activity of the protein can be determined In an important embodiment a mutant FGF-CX protein can be assayed for (1) the ability to form protein protein interactions with other FGF-CX proteins, other cell-surface proteins, or biologically active portions thereof, (2) complex formation between a mutant FGF-CX protein and a FGF-CX receptor, (3) the ability of a mutant FGF-CX protein to bind to an mtracellular target protein or biologically active portion thereof, (e g , avidm proteins), or (4) the ability to specifically bind an anti-FGF-CX protein antibody Antisense Another aspect of the invention pertains to isolated antisense nucleic acid molecules that are hybndizable to or complementary to the nucleic acid molecule composing the nucleotide sequence of SEQ ID NO 1, or fragments, analogs or deovatives thereof An "antisense" nucleic acid composes a nucleotide sequence that is complementary to a "sense" nucleic acid encoding a protein, e g , complementary to the coding strand of a double-stranded cDNA molecule or complementary to an mRNA sequence In specific aspects, antisense nucleic acid molecules are provided that compose a sequence complementary to at least about 10, 25, 50, 100, 250 or 500 nucleotides or an entire FGF-CX coding strand, or to only a portion thereof Nucleic acid molecules encoding fragments, homologs, deovatives and analogs of a FGF-CX protein of SEQ ID NO 2 or antisense nucleic acids complementary to a FGF-CX nucleic acid sequence of SEQ ID NO 1 are additionally provided In one embodiment, an antisense nucleic acid molecule is antisense to a "coding region" of the coding strand of a nucleotide sequence encoding FGF-CX The term "coding region" refers to the region of the nucleotide sequence composing codons which are translated into amino acid residues (e g , the protein coding region of human FGF-CX corresponds to SEQ ID NO 2) In another embodiment, the antisense nucleic acid molecule is antisense to a "noncoding region" of the coding strand of a nucleotide sequence encoding FGF-CX The term "noncoding region" refers to 5' and 3' sequences which flank the coding region that are not translated into ammo acids (i e , also refened to as 5' and 3' untranslated regions) Given the coding strand sequences encoding FGF-CX disclosed herein (e g , SEQ ID NO 1 ), antisense nucleic acids of the invention can be designed according to the rules of Watson and Cock or Hoogsteen base paiong The antisense nucleic acid molecule can be complementary to the entire coding region of FGF-CX mRNA, but more preferably is an ohgonucleotide that is antisense to only a portion of the coding or noncoding region of FGF- CX mRNA For example, the antisense ohgonucleotide can be complementary to the region surrounding the translation start site of FGF-CX mRNA An antisense ohgonucleotide can be, for example, about 5, 10. 15, 20. 25. 30, 35. 40, 45 or 50 nucleotides in length. An antisense nucleic acid of the invention can be constructed using chemical synthesis or enzymatic ligation reactions using procedures known in the art For example, an antisense nucleic acid (e g , an antisense ohgonucleotide) can be chemically synthesized using naturally occurring nucleotides or vaoously modified nucleotides designed to increase the biological stability of the molecules or to increase the physical stability of the duplex formed between the antisense and sense nucleic acids, e g , phosphorothioate deovatives and acodine substituted nucleotides can be used Examples of modified nucleotides that can be used to generate the antisense nucleic acid include. 5-fluorouracιl, 5-bromouracιl, 5-chlorouracιl, 5-ιodouracιl, hypoxanthme, xanthine, 4-acetylcytosme. 5-(carboxyhydroxylmethyl) uracil. 5-carboxymethylammomethyl- 2-thιourιdme, 5-carboxymethylammomethyluracιl, dihydrouracil, beta-D-galactosylqueosine, inosine, N6-ιsopentenyladenme. 1 -methylguanine, 1 -methylmosme, 2,2-dιmethylguanιne, 2-mefhyladenme, 2-methylguanιne, 3-methylcytosme, 5-methylcytosιne, N6-adenme, 7-methylguanme, 5-methylammomethyluracιl, 5-methoxyammomethyl-2-thιouracιl, beta-D-mannosylqueosme. 5'-methoxycarboxymethyluracιl, 4-thιouracιl, 5-methyluracιl, 5-methoxyuracιl, 2-methylthιo-N6-ιsopentenyladenme, uracιl-5-oxyacetιc acid (v), wybutoxosine, pseudouracil, queosine, 2-thιocytosιne. 5-methyl-2-thιouracιl, 2-thιouracιl, uracιl-5-oxyacetιc acid methylester, uracιl-5-oxyacetιc acid (v). 5-methyl-2-thιouracιl, 3-(3-ammo-3-N-2-carbo\ypropyl) uracil, (acp3)w, and 2,6-dιammopuone Alternatively, the antisense nucleic acid can be produced biologically using an expression v ector into which a nucleic acid has been subcloned m an antisense onentation (i e , RNA transcnbed from the inserted nucleic acid will be of an antisense ooentation to a target nucleic acid of interest, descobed further in the following subsection). The antisense nucleic acid molecules of the invention are typically administered to a subject or generated in situ such that they hybodize with or bind to cellular mRNA and/or genomic DNA encoding a FGF-CX protein to thereby inhibit expression of the protein, e g , by inhibiting transcnption and/or translation The hybndization can be by conventional nucleotide complementanty to form a stable duplex, or, for example, in the case of an antisense nucleic acid molecule that binds to DNA duplexes, through specific interactions m the major groove of the double helix An example of a route of administration of antisense nucleic acid molecules of the invention includes direct injection at a tissue site Alternatively, antisense nucleic acid molecules can be modified to target selected cells and then administered systemically For example, for systemic administration, antisense molecules can be modified such that they specifically bind to receptors or antigens expressed on a selected cell surface, e g , by linking the antisense nucleic acid molecules to peptides or antibodies that bind to cell surface receptors or antigens The antisense nucleic acid molecules can also be delivered to cells using the vectors descobed herein To achieve sufficient mtracellular concentrations of antisense molecules, vector constructs in which the antisense nucleic acid molecule is placed under the control of a strong pol II or pol III promoter are preferred In yet another embodiment, the antisense nucleic acid molecule of the invention is an α-anomeoc nucleic acid molecule An α-anomenc nucleic acid molecule forms specific double-stranded hybnds with complementary RNA which, contrary to the usual β-units, the strands run parallel to each other (Gaultier et al (1987) Nucleic Acids Res 15 6625-6641) The antisense nucleic acid molecule can also compnse a 2'-o-methylnbonucleotιde (Inoue et al 1987 Nucleic Acids Res 15 6131-6148) or a chimenc RNA -DNA analogue (Inoue et al 1987 FEBS Lett 215 327-330) Ribozymes and PNA moieties Such modifications include, by way of nonlimitmg example, modified bases, and nucleic acids hose sugar phosphate backbones are modified or deovatized These modifications are earned out at least in part to enhance the chemical stability of the modified nucleic acid, such that they mav be used, for example, as antisense binding nucleic acids m therapeutic applications m a subject In still another embodiment, an antisense nucleic acid of the invention is a obozyme Ribozymes are catalytic RNA molecules with obonuclease activity that are capable of cleaving a single-stranded nucleic acid, such as an mRNA, to which they have a complementary region Thus, nbozymes (e g . hammerhead nbozymes (descnbed in Haselhoff and Gerlach 1988 Nature 334 585-591)) can be used to catalvtically cleave FGF-CX mRNA transcnpts to thereby inhibit translation of FGF-CX mRNA A obozyme having specificity for a FGF-CX-encoding nucleic acid can be designed based upon the nucleotide sequence of a FGF-CX DNA disclosed herein (i e , SEQ ID NO 1) For example, a deovative of a Tetrahymena L-19 IVS RNA can be constructed in which the nucleotide sequence of the active site is complementary to the nucleotide sequence to be cleaved in a FGF-CX-encoding mRNA See, e g , Cech et al U S Pat No 4,987.071, and Cech et al U S Pat No 5,1 16,742 Alternatively, FGF-CX mRNA can be used to select a catalytic RNA having a specific obonuclease activity from a pool of RNA molecules See. e g , Bartel et al . (1993) Science 261 141 1-1418 Alternativel , FGF-CX gene expression can be inhibited by targeting nucleotide sequences complementary to the regulatory region of the FGF-CX (e g , the FGF-CX promoter and/or enhancers) to form tnple helical structures that prevent transcnption of the FGF-CX gene in target cells See generally, Helene 1991 Anticancer Drug Des 6 569-84, Helene et al 1992 Ann N Y Acad Sci 660 27-36, and Maher 1992 Bioassays 14 807-15 In vaoous embodiments, the nucleic acids of FGF-CX can be modified at the base moiety, sugar moiety or phosphate backbone to improve, e g , the stability, hybodization, or solubility of the molecule For example, the deoxyobose phosphate backbone of the nucleic acids can be modified to generate peptide nucleic acids (see Hyrup et al (1996) Bioorg Med Chem 4 5-23) As used herein, the terms "peptide nucleic acids" or "PNAs" refer to nucleic acid mimics, e g , DNA mimics, in which the deoxynbose phosphate backbone is replaced by a pseudopeptide backbone and only the four natural nucleobases are retained The neutral backbone of PNAs has been shown to allow for specific hybndization to DNA and RNA under conditions of low ionic strength The synthesis of PNA ohgomers can be performed using standard solid phase peptide synthesis protocols as descnbed in Hyrup et al 1996 above, Perry-O'Keefe et al 1996 PNAS 93 14670-675 PNAs of FGF-CX can be used in therapeutic and diagnostic applications For example, PNAs can be used as antisense or antigene agents for sequence-specific modulation of gene expression by, e g , inducing transcoption or translation arrest or inhibiting replication PNAs of FGF-CX can also be used, e g , in the analysis of single base pair mutations in a gene by, e g , PNA directed PCR clamping, as artificial restnction enzymes when used in combination with other enzymes, e g , SI nucleases (Hyrup B ( 1996) above), or as probes or pnmers for DNA sequence and hybndization (Hyrup et al (1996), above, Perry-O'Keefe (1996), above) In another embodiment, PNAs of FGF-CX can be modified, e g , to enhance their stability or cellular uptake, by attaching hpophihc or other helper groups to PNA, by the formation of PNA-DNA chimeras, or by the use of liposomes or other techniques of drug delivery known in the art For example, PNA-DNA chimeras of FGF-CX can be generated that may combine the advantageous properties of PNA and DNA Such chimeras allow DNA recognition enzymes, e g , RNase H and DNA polymerases, to interact with the DNA portion while the PNA portion would provide high binding affinity and specificity PNA-DNA chimeras can be linked using linkers of appropnate lengths selected in terms of base stacking, number of bonds between the nucleobases, and ooentation (Hyrup 1996 above) The synthesis of PNA-DNA chimeras can be performed as descobed m Hyrup 1996 above and Finn et al 1996 Nucl Acids Res 24 3357-63 For example, a DNA chain can be synthesized on a solid support using standard phosphoramidite coupling chemistry, and modified nucleoside analogs, e g , 5'-(4-methoxytotvl)amιno-5'-deoxy-thvmιdme phosphoramidite, can be used between the PNA and the 5' end of DNA (Mag et al 1989 Nucl Acid Res 17 5973-88) PNA monomers are then coupled in a stepwise manner to produce a chimeoc molecule with a 5' PNA segment and a 3' DNA segment (Finn et al 1996 above) Alternatively, chimeoc molecules can be synthesized with a 5' DNA segment and a 3' PNA segment See, Petersen et al 1975 Bioorg Med Chem Lett 5 11 19-1 1 124 In other embodiments, the ohgonucleotide may include other appended groups such as peptides (e g , for targeting host cell receptors in vivo), or agents facilitating transport across the cell membrane (see, e g , Letsmger et al , 1989. Proc Natl Acad Sci U S A 86 6553-6556, Lemaitre ef <a/ , 1987, Proc Natl Acad Sci 84 648-652, PCT Publication No W088/09810) or the blood-bram bamer (see e g , PCT Publication No W089/10134) In addition, oligonucleotides can be modified with hybodization toggered cleavage agents (See, e g , Krol et al , 1988, BioTechniques 6 958-976) or intercalating agents (See, e g , Zon, 1988, Pharm Res 5 539-549) To this end, the ohgonucleotide may be conjugated to another molecule, e g , a peptide. a hybndization tnggered cross-linking agent, a transport agent, a hybndization-tnggered cleavage agent, etc FGF-CX polypeptides The novel protein of the invention includes the FGF-CX-hke protein whose sequence is provided in FIG 1 (SEQ ID NO 2) The invention also includes a mutant or vanant protein any of whose residues may be changed from the corresponding residue shown m FIG 1 while still encoding a protein that maintains its FGF-CX-hke activities and physiological functions, or a functional fragment thereof In the mutant or vanant protein, up to 20% or more of the residues may be so changed In general, an FGF-CX -like vanant that preserves FGF-CX-hke function includes any vaoant in which residues at a particular position in the sequence have been substituted by other amino acids, and further include the possibility of inserting an additional residue or residues between two residues of the parent protein as well as the possibility of deleting one or more residues from the parent sequence Any ammo acid substitution, insertion, or deletion is encompassed by the invention In favorable circumstances, the substitution is a conservative substitution as defined above Furthermore, without limiting the scope of the invention, the following positions in Table 2 (using the numbeong provided in SEQ ID NO 2) may be substituted as indicated, such that a mutant or vanant protein may include one or more than one of the substitutions indicated The suggested substitutions do not limit the range of possible substitutions that may be made at a given position TABLE 2 Position Possible Substit 6 Glu to Asp 9 Glv to Ser, Thr, or Asn 10 Phe to Tyr 1 1 Leu to Phe or He 15 Glu to Asp 16 Gly to Ala 17 Leu to He or Val 19 Gin may be deleted 21 Val to Phe or He 31 Gly to Lys, Arg, Ser, or Ala 33 Arg to Lys or Ser 35 Pro to Leu or Val 38 Gly to Asn or Ser 39 Glu to Asp 43 Ala to Gin, Asn. or Ser 48 Ala to Ser or Gly 51 Gly to Ala 53 Gly to Ala or deleted 54 Ala to Gly, Val, or deleted 55 Ala to Ser or Thr 56 Gin to Asp, Glu, or Asn 58 Ala to Ser, Thr, Asn, Gin, Asp, or Glu 61 His to Gin, Asn. Lys, or Arg 78 Gin to Asn, Glu. or Asp 80 Leu to Phe or He 82 Asp to Glu, Asn, or Gin 84 Ser to Asn, Thr, or Gin 85 Val to He 90 Gin to Asn or Lys 103 Val to He 115 Ser to Thr 123 Asp to Glu 128 Tvr to Phe 135 Ser to Thr. Gin, or Asn 138 He to Val or Leu 155 He to Leu 159 Gly to Val or Ala 161 Thr to Ser 166 Phe to Tyr 177 Asp to GΪu 181 Ser to Ala or Thr 198 Glu to Asp 199 Arg to Lys 207 Leu to He or Val 209 Met to any residue 211 Thr to Ser One aspect of the invention pertains to isolated FGF-CX proteins, and biologically active portions thereof, or denvatives. fragments, analogs or homologs thereof Also provided are polypeptide fragments suitable for use as immunogens to raise anti-FGF-CX antibodies In one embodiment, native FGF-CX proteins can be isolated from cells or tissue sources by an appropnate punfication scheme using standard protein purification techniques In another embodiment. FGF-CX proteins are produced by recombinant DNA techniques Alternative to recombinant expression, a FGF-CX protein or polypeptide can be synthesized chemically using standard peptide synthesis techniques An "isolated" or "punfied" protein or biologically active portion thereof is substantially free of cellular mateoal or other contaminating proteins from the cell or tissue source from which the FGF-CX protein is denved, or substantially free from chemical precursors or other chemicals when chemically synthesized The language "substantially free of cellular material" includes preparations of FGF-CX protein m which the protein is separated from cellular components of the cells from which it is isolated or recombinantly produced In one embodiment, the language "substantially free of cellular mateoal" includes preparations of FGF-CX protein having less than about 30% (by dry weight) of non-FGF-CX protein (also referred to herein as a "contaminating protein"), more preferably less than about 20%o of non-FGF-CX protein, still more preferably less than about 10% of non-FGF-CX protein, and most preferably less than about 5% non-FGF-CX protein When the FGF-CX protein or biologically active portion thereof is recombinantly produced, it is also preferably substantially free of culture medium, / e , culture medium represents less than about 20%, more preferably less than about 10%, and most preferably less than about 5% of the volume of the protein preparation The language "substantially free of chemical precursors or other chemicals" includes preparations of FGF-CX protein in which the protein is separated from chemical precursors or other chemicals that are involved m the synthesis of the protein In one embodiment, the language "substantially free of chemical precursors or other chemicals" includes preparations of FGF-CX protein having less than about 30% (by dry weight) of chemical precursors or non-FGF-CX chemicals, more preferably less than about 20% chemical precursors or non-FGF-CX chemicals, still more preferablv less than about 10% chemical precursors or non-FGF-CX chemicals, and most preferablv less than about 5% chemical precursors or non-FGF-CX chemicals Biologically active portions ot a FGF-CX protein include peptides compnsing amino acid sequences sufficiently homologous to or denved from the amino acid sequence of the FGF-CX protein, e g , the ammo acid sequence shown m SEQ ID NO 2 that include fewer ammo acids than the full length FGF-CX proteins, and exhibit at least one activity of a FGF- CX protein Typically, biologically active portions compose a domain or motif with at least one activity of the FGF-CX protein A biologically active portion of a FGF-CX protein can be a polypeptide which is, for example, 10, 25. 50, 100 or more amino acids in length A biologically active portion of a FGF-CX protein of the present invention may contain at least one of the above-identified domains substantially conserved between the FGF family of proteins Moreover, other biologically active portions, in which other regions of the protein are deleted, can be prepared by recombinant techniques and evaluated for one or more of the functional activities of a nativ e FGF-CX protein In an embodiment, the FGF-CX protein has an ammo acid sequence shown in SEQ ID NO 2 In other embodiments, the FGF-CX protein is substantially homologous to SEQ ID NO 2 and retains the functional activity of the protein of SEQ ID NO 2, yet differs in ammo acid sequence due to natural allehc v aoation or mutagenesis, as descobed in detail below Accordingly, in another embodiment, the FGF-CX protein is a protein that composes an amino acid sequence at least about 45% homologous to the ammo acid sequence of SEQ ID NO 2 and retains the functional activity of the FGF-CX proteins of SEQ ID NO 2 In another embodiment, the FGF-CX is a protein that contains an amino acid sequence at least about 45% homologous, and more preferably about 55. 65, 70, 75. 80. 85, 90, 95, 98 or even 99% homologous to the amino acid sequence of SEQ ID NO 2 and retains the functional activity of the FGF-CX proteins of the corresponding polypeptide having the sequence of SEQ ID NO.2. Determining homology between two or more sequences To determine the percent homology of two ammo acid sequences or of two nucleic acids, the sequences are aligned for optimal companson purposes (e g , gaps can be introduced in either of the sequences being compared for optimal alignment between the sequences) The ammo acid residues or nucleotides at corresponding ammo acid positions or nucleotide positions are then compared When a position m the first sequence is occupied by the same ammo acid residue or nucleotide as the corresponding position m the second sequence, then the molecules are homologous at that position (i e , as used herein ammo acid or nucleic acid "homology" is equivalent to amino acid or nucleic acid "identity") The nucleic acid sequence homology may be determined as the degree of identity between two sequences The homology may be determined using computer programs known in the art, such as GAP software provided m the GCG program package See, Needleman and Wunsch 1970 J Mol Biol 48 443-453 Using GCG GAP software with the following settings for nucleic acid sequence companson GAP creation penalty of 5 0 and GAP extension penalty of 0 3, the coding region of the analogous nucleic acid sequences referred to above exhibits a degree of identity preferably of at least 70%, 75%, 80%, 85%. 90%, 95%, 98%, or 99%, with the CDS (encoding) part of the DNA sequence shown in SEQ ID NO 1 The term "sequence identity" refers to the degree to which two polynucleotide or polypeptide sequences are identical on a residue-by-residue basis over a particular region of companson The term "percentage of sequence identity" is calculated by companng two optimally aligned sequences over that region of companson. determining the number of positions at which the identical nucleic acid base (e g , A, T, C, G, U, or I, in the case of nucleic acids) occurs m both sequences to yield the number of matched positions, dividing the number of matched positions by the total number of positions in the region of companson (ι e the window size), and multiplying the result by 100 to yield the percentage of sequence identity The term "substantial identity" as used herein denotes a charactenstic of a polynucleotide sequence, wherem the polynucleotide composes a sequence that has at least 80 percent sequence identity, preferably at least 85 percent identity and often 90 to 95 percent sequence identity, more usually at least 99 percent sequence identity as compared to a reference sequence over a compaoson region The term "percentage of positive residues" is calculated by compaong two optimally aligned sequences over that region of compaoson, determining the number of positions at which the identical and conservative amino acid substitutions, as defined above, occur in both sequences to yield the number of matched positions, dividing the number of matched positions by the total number of positions in the region of companson (i e the window size), and multiplying the result by 100 to yield the percentage of positive residues Chimeric and fusion proteins The invention also provides FGF-CX chimeoc or fusion proteins As used herein, a FGF-CX "chimenc protein" or "fusion protein" compnses a FGF-CX polypeptide operatively linked to a non-FGF-CX polypeptide A "FGF-CX polypeptide" refers to a polypeptide having an ammo acid sequence conespondmg to FGF-CX. whereas a "non-FGF-CX polypeptide" refers to a polypeptide having an amino acid sequence corresponding to a protein that is not substantiallv homologous to the FGF-CX protein, e g , a protein that is different from the FGF-CX protein and that is denved from the same or a different organism Withm a FGF-CX fusion protein the FGF-CX polypeptide can correspond to all or a portion of a FGF- CX protein In one embodiment, a FGF-CX fusion protein compnses at least one biologically active portion of a FGF-CX protein In another embodiment, a FGF-CX fusion protein comprises at least two biologically active portions of a FGF-CX protein Withm the fusion protein, the term "operatively linked" is intended to indicate that the FGF-CX polypeptide and the non-FGF-CX polypeptide are fused m-frame to each other The non-FGF-CX polypeptide can be fused to the N-terminus or C-terminus of the FGF-CX polypeptide For example, in one embodiment a FGF-CX fusion protein composes a FGF-CX polypeptide operably linked to the extracellular domain of a second protein Such fusion proteins can be further utilized in screening assays for compounds that modulate FGF-CX activity (such assays are described in detail below) In another embodiment, the fusion protein is a GST-FGF-CX fusion protein in which the FGF-CX sequences are fused to the C -terminus of the GST (i e , glutathione S-transferase) sequences Such fusion proteins can facilitate the punfication of recombinant FGF-CX In yet another embodiment, the fusion protein is a FGF-CX protein containing a heterologous signal sequence at its N-terminus For example, the native FGF-CX signal sequence (/ e , amino acids 1 to 20 of SEQ ID NO 2 ) can be removed and replaced with a signal sequence from another protein In certain host cells (e g , mammalian host cells), expression and/or secretion of FGF-CX can be increased through use of a heterologous signal sequence In another embodiment, the fusion protein is a FGF-CX-immunoglobuhn fusion protein in which the FGF-CX sequences composing one or more domains are fused to sequences deoved from a member of the lmmunoglobulm protein family The FGF- CX-immunoglobuhn fusion proteins of the invention can be incorporated into pharmaceutical compositions and administered to a subject to inhibit an interaction between a FGF-CX ligand and a FGF-CX protein on the surface of a cell, to thereby suppress FGF-CX-mediated signal transduction in vivo In one nonlimitmg example, a contemplated FGF-CX ligand of the invention is the FGF-CX receptor The FGF-CX-immunoglobuhn fusion proteins can be used to affect the bioavailabihty of a FGF-CX cognate ligand Inhibition of the FGF-CX hgand/FGF-CX interaction mav be useful therapeutically for both the treatment of proliferative and differentiativ e disorders, as well as modulating (e g , promoting or inhibiting) cell survival Moreover, the FGF-CX-immunoglobulm fusion proteins of the invention can be used as immunogens to produce anti-FGF-CX antibodies in a subject, to puofy FGF-CX hgands. and in screening assays to identify molecules that inhibit the interaction of FGF-CX with a FGF-CX ligand A FGF-CX chimeric or fusion protein of the invention can be produced by standard recombinant DNA techniques For example, DNA fragments coding for the different polypeptide sequences are ligated together m-frame in accordance with conventional techniques, e g , by employing blunt-ended or stagger-ended termini for ligation, restoction enzyme digestion to provide for appropoate termini, fillmg-in of cohesive ends as appropoate, alkaline phosphatase treatment to avoid undesirable joining, and enzymatic ligation In another embodiment, the fusion gene can be synthesized by conventional techniques including automated DNA synthesizers Alternatively, PCR amplification of gene fragments can be earned out using anchor primers that give rise to complementary ov erhangs between two consecutive gene fragments that can subsequently be annealed and reamplified to generate a chimeoc gene sequence (see, for example, Ausubel et al (eds ) CURRENT PROTOCOLS IN MOLECULAR BIOLOGY, John Wiley & Sons, 1992) Moreover, many expression vectors are commercially available that already encode a fusion moiety (e g , a GST polypeptide) A FGF-CX-encodmg nucleic acid can be cloned into such an expression vector such that the fusion moiety is linked m-frame to the FGF-CX protein FGF-CX agonists and antagonists The present invention also pertains to vaoants of the FGF-CX proteins that function as either FGF-CX agonists (mimetics) or as FGF-CX antagonists Vaoants of the FGF-CX protein can be generated by mutagenesis, e g , discrete point mutation or truncation of the FGF-CX protein An agonist of the FGF-CX protein can retain substantially the same, or a subset of, the biological activities of the naturally occumng form of the FGF-CX protein An antagonist of the FGF-CX protein can inhibit one or more of the activities of the naturally occumng form of the FGF-CX protein by, for example, competitively binding to a downstream or upstream member of a cellular signaling cascade which includes the FGF-CX protein Thus, specific biological effects can be elicited by treatment with a vanant of limited function In one embodiment, treatment of a subject with a vanant having a subset of the biological activities of the naturally occumng form of the protein has fewer side effects in a subiect relative to treatment with the naturally occurring form of the FGF-CX proteins Vanants of the FGF-CX protein that function as either FGF-CX agonists (mimetics) or as FGF-CX antagonists can be identified by screening combinatonal hbranes of mutants, e g , truncation mutants, of the FGF-CX protein for FGF-CX protein agonist or antagonist activity In one embodiment, a vanegated library of FGF-CX v anants is generated by combinatonal mutagenesis at the nucleic acid level and is encoded by a vaoegated gene library A vaoegated library of FGF-CX vaoants can be produced by, for example, enzymatically ligatmg a mixture of synthetic oligonucleotides into gene sequences such that a degenerate set of potential FGF-CX sequences is expressible as individual polypeptides, or alternatively, as a set of larger fusion proteins (e g , for phage display) containing the set of FGF-CX sequences therein There are a vanety of methods which can be used to produce hbraoes of potential FGF-CX vaoants from a degenerate ohgonucleotide sequence Chemical synthesis of a degenerate gene sequence can be performed in an automatic DNA synthesizer, and the synthetic gene then ligated into an appropnate expression vector Use of a degenerate set of genes allows for the provision, in one mixture, of all of the sequences encoding the desired set of potential FGF-CX sequences Methods for synthesizing degenerate oligonucleotides are known in the art (see, e g , Narang 1983)= Tetrahedron 39 3, Itakura et al 1984 Annu Rev Biochem 53 323. Itakura et al 1984 Science 198 1056, Ike et al 1983 Nucl Acid Res 11 477 Polypeptide libraries In addition, libraries of fragments of the FGF-CX protein coding sequence can be used to generate a vaoegated population of FGF-CX fragments for screening and subsequent selection of vaoants of a FGF-CX protein In one embodiment, a library of coding sequence fragments can be generated by treating a double stranded PCR fragment of a FGF-CX coding sequence with a nuclease under conditions wherem nicking occurs only about once per molecule, denatuong the double stranded DNA, renatuong the DNA to form double stranded DNA that can include sense/ antisense pairs from different nicked products, removing single stranded portions from reformed duplexes by treatment with SI nuclease, and ligatmg the resulting fragment library into an expression vector By this method, an expression library can be denved which encodes N-termmal and internal fragments of vanous sizes of the FGF-CX protein Several techniques are known m the art for screening gene products of combinatonal hbranes made by point mutations or truncation, and for screening cDNA hbranes for gene products having a selected property Such techniques are adaptable for rapid screening of the gene hbraoes generated by the combmatooal mutagenesis of FGF-CX proteins The most widely used techniques, which are amenable to high throughput analysis, for screening large gene hbraoes typically include cloning the gene library into rephcable expression vectors, transforming appropoate cells with the resulting library of vectors, and expressing the combmatooal genes under conditions in which detection of a desired activity facilitates isolation of the vector encoding the gene whose product was detected Recrusive ensemble mutagenesis (REM), a new technique that enhances the frequency of functional mutants in the hbraoes, can be used in combination with the screening assays to identify FGF-CX vaoants (Arkm and Yourvan 1992 PNAS 89 7811-7815. Delgrave et al 1993 Protein Engmeeong 6 327-331) Anti-FGF-CX Antibodies The term "antibody" as used herein refers to lmmunoglobulm molecules and lmmunologically active portions of immunoglobulin (Ig) molecules, i e , molecules that contain an antigen binding site that specifically binds (immunoreacts with) an antigen Such antibodies include, but are not limited to, polyclonal, monoclonal, chimeoc, single chain, Fab. Fab' and F(ab')2 fragments, and an Fab expression library In general, antibody molecules obtained from humans relates to any of the classes IgG, IgM, IgA, IgE and IgD. which differ from one another by the nature of the heavy chain present in the molecule Certain classes have subclasses as well, such as IgGl, IgG2, and others Furthermore, in humans, the light chain may be a kappa chain or a lambda chain Reference herein to antibodies includes a reference to all such classes, subclasses and types of human antibody species An isolated protein of the invention intended to serve as an antigen, or a portion or fragment thereof, can be used as an immunogen to generate antibodies that immunospecifically bind the antigen, using standard techniques for polyclonal and monoclonal antibody preparation The full-length protein can be used or, alternatively, the invention provides antigemc peptide fragments of the antigen for use as immunogens An antigemc peptide fragment compnses at least 6 ammo acid residues of the ammo acid sequence of the full length protein, such as an ammo acid sequence shown in SEQ ID NO 2, and encompasses an epitope thereof such that an antibody raised against the peptide forms a specific immune complex with the full length protein or with any fragment that contains the epitope Preferably, the antigemc peptide composes at least 10 amino acid residues, or at least 15 amino acid residues, or at least 20 amino acid residues, or at least 30 ammo acid residues Preferred epitopes encompassed by the antigemc peptide are regions of the protein that are located on its surface, commonly these are hydrophihc regions In certain embodiments of the invention, at least one epitope encompassed by the antigemc peptide is a region of the FGF-CX that is located on the surface of the protein, e g , a hydrophihc region A hydrophobicity analysis of the human FGF-CX protein sequence will indicate which regions of a FGF-CX polypeptide are particularly hydrophihc and, therefore, are likely to encode surface residues useful for targeting antibody production As a means for targeting antibody production, hydropathy plots showing regions of hydrophihcity and hydrophobicity may be generated by any method well known in the art. including, for example, the Kyte Doohttle or the Hopp Woods methods, either with or without Fouoer transformation See. e g , Hopp and Woods, 1981, Proc Nat Acad Sci USA 78 3824-3828, Kyte and Doohttle 1982, J Mol Biol 157 105-142, each incorporated herein by reference in their entirety Antibodies that are specific for one or more domains within an antigemc protein, or deovatives, fragments, analogs or homologs thereof, are also provided herein A protein of the invention, or a deovative, fragment, analog, homolog or ortholog thereof, may be utilized as an immunogen in the generation of antibodies that immunospecifically bind these protein components Vaoous procedures known within the art may be used for the production of polyclonal or monoclonal antibodies directed against a protein of the invention, or against deovatives, fragments, analogs homologs or orthologs thereof (see, for example, Antibodies A Laboratory Manual, Harlow and Lane (ed ), 1988, Cold Spong Harbor Laboratory Press, Cold Spong Harbor, NY, incorporated herein by reference) Some of these antibodies are discussed below 1. Polyclonal Antibodies For the production of polyclonal antibodies, vaoous suitable host animals (e g , rabbit, goat, mouse or other mammal) may be immunized by one or more injections with the FGF-CX native protein, a synthetic vaoant thereof, or a deovative of the foregoing An appropoate lmmunogenic preparation can contain, for example, the naturally occumng lmmunogenic protein, a chemically synthesized polypeptide representing the lmmunogenic protein, or a recombinantly expressed lmmunogenic protein Furthermore, the FGF-CX protein may be conjugated to a second protein known to be lmmunogenic m the mammal being immunized Examples of such lmmunogenic proteins include but are not limited to keyhole limpet hemocyanin, serum albumin, bovine thyroglobulm, and soybean trypsin inhibitor The preparation can further include an adjuvant Vaoous adjuvants used to increase the immunological response include, but are not limited to, Freund's (complete and incomplete), mineral gels (e g , aluminum hydroxide), surface active substances (e g , lysolecithm, pluromc polyols, polyamons, peptides, oil emulsions, dimtrophenol. etc ), adjuvants usable in humans such as Bacille Calmette-Gueon and Corynebacteoum parvum, or similar immunostimulatory agents Additional examples of adjuvants which can be employed include MPL-TDM adjuvant (monophosphoryl Lipid A, synthetic trehalose dicorynomycolate) The polyclonal antibody molecules directed against the lmmunogenic FGF-CX protein can be isolated from the mammal (e g , from the blood) and further puofied by well known techniques, such as affinity chromatography using protein A or protein G, which provide pomaoly the IgG fraction of immune serum Subsequently, or alternatively, the specific antigen which is the target of the lmmunoglobulm sought, or an epitope thereof, may be immobilized on a column to punfy the immune specific antibody by lmmunoaffmity chromatography Puofication of immunoglobulms is discussed, for example, by D Wilkinson (The Scientist, published by The Scientist, Inc , Philadelphia PA, Vol 14, No 8 (Apol 17. 2000), pp 25-28) 2. Monoclonal Antibodies The term "monoclonal antibody" (MAb) or "monoclonal antibody composition", as used herein, refers to a population of antibody molecules that contain only one molecular species of antibody molecule consisting of a unique light chain gene product and a unique heavy chain gene product In particular, the complementanty determining regions (CDRs) of the monoclonal antibody are identical in all the molecules of the population MAbs thus contain an antigen binding site capable of lmmunoreacting with a particular epitope of the antigen charactenzed by a unique binding affinity for it Monoclonal antibodies can be prepared using hybodoma methods, such as those descobed by Kohler and Milstein, 1975 Nature, 256 495 In a hybodoma method, a mouse, hamster, or other appropoate host animal, is typically immunized with an immunizing agent to elicit lymphocytes that produce or are capable of producing antibodies that will specifically bind to the immunizing agent Alternatively, the lymphocytes can be immunized in vitro The immunizing agent will typically include the FGF-CX protein antigen, a fragment thereof or a fusion protein thereof Generallv, either peopheral blood lymphocytes are used if cells of human oogin are desired, or spleen cells or lymph node cells are used if non-human mammalian sources are desired The lymphocytes are then fused with an immortalized cell line using a suitable fusing agent, such as polyethylene glycol, to form a hybodoma cell [Goding, Monoclonal Antibodies. Poncφles and Practice, Academic Press, (1986) pp 59- 103] Immortalized cell lines are usually transformed mammalian cells, particularly myeloma cells of rodent, bovine and human origin Usually, rat or mouse myeloma cell lines are employed The hybodoma cells can be cultured in a suitable culture medium that preferably contains one or more substances that inhibit the growth or survival of the unfused. immortalized cells For example, if the parental cells lack the enzyme hypoxanthme guanme phosphoobosyl transferase (HGPRT or HPRT), the culture medium for the hybodomas typically will include hypoxanthme, aminoptenn, and thymidine ("HAT medium"), which substances prevent the growth of HGPRT-deficient cells Prefened immortalized cell lines are those that fuse efficiently, support stable high level expression of antibody by the selected antibody -producing cells, and are sensitive to a medium such as HAT medium More preferred immortalized cell lines are munne myeloma lines, which can be obtained, for instance, from the Salk Institute Cell Distobution Center, San Diego. California and the Ameocan Type Culture Collection, Manassas, Virginia Human myeloma and mouse-human heteromyeloma cell lines also have been descnbed for the production of human monoclonal antibodies (Kozbor 1984 J Immunol. 133.3001, Brodeur et al Monoclonal Antibody Production Techniques and Applications, Marcel Dekker, Inc., New York, 1987 pp. 51-63) The culture medium in which the hybndoma cells are cultured can then be assayed for the presence of monoclonal antibodies directed against the antigen Preferably, the binding specificity of monoclonal antibodies produced by the hybodoma cells is determined by immunoprecipitation or by an in vitro binding assay, such as radioimmunoassay (RIA) or enzyme-linked immunoabsorbent assay (ELISA) Such techniques and assays are known m the art The binding affinity of the monoclonal antibody can, for example, be determined by the Scatchard analysis of Munson and Pollard, 1980 Anal. Biochem., 107.220. It is an objective, especially important in therapeutic applications of monoclonal antibodies, to identify antibodies having a high degree of specificity and a high binding affinity for the target antigen After the desired hybndoma cells are identified, the clones can be subcloned by limiting dilution procedures and grown by standard methods (Godmg,1986) Suitable culture media for this purpose include, for example, Dulbecco's Modified Eagle's Medium and RPMI- 1640 medium Alternativ ely, the hybodoma cells can be grown in vivo as ascites m a mammal The monoclonal antibodies secreted by the subclones can be isolated or puofied from the culture medium or ascites fluid by conventional immunoglobulm puofication procedures such as, for example, protein A-Sepharose, hydroxylapatite chromatography, gel electrophoresis. dialysis, or affinity chromatography The monoclonal antibodies can also be made by recombinant DNA methods, such as those descobed in U S Patent No 4.816,567 DNA encoding the monoclonal antibodies of the invention can be readily isolated and sequenced using conventional procedures (e g , by using ohgonucleotide probes that are capable of binding specifically to genes encoding the heavy and light chains of muone antibodies) The hybodoma cells of the invention serve as a preferred source of such DNA Once isolated, the DNA can be placed into expression vectors, which are then transfected into host cells such as simian COS cells, Chinese hamster ovary (CHO) cells, or myeloma cells that do not otherwise produce immunoglobulm protein, to obtain the synthesis of monoclonal antibodies in the recombinant host cells The DNA also can be modified, for example, by substituting the coding sequence for human heavy and light chain constant domains in place of the homologous muone sequences (U S Patent No 4.816,567, Momson, Nature 368, 812-13 (1994)) or by covalently joining to the immunoglobulm coding sequence all or part of the coding sequence for a non-immunoglobuhn polypeptide Such a non-immunoglobuhn polypeptide can be substituted for the constant domains of an antibody of the invention, or can be substituted for the vaoable domains of one antigen-combming site of an antibody of the invention to create a chimenc bivalent antibody 3. Humanized Antibodies The antibodies directed against the FGF-CX protein antigens of the invention can further compnse humanized antibodies or human antibodies These antibodies are suitable for administration to humans without engendenng an immune response by the human against the administered immunoglobulm Humanized forms of antibodies are chimenc immunoglobulms, immunoglobulm chains or fragments thereof (such as Fv, Fab, Fab', F(ab')2 or other antigen- binding subsequences of antibodies) that are pnncipally compnsed of the sequence of a human immunoglobulm, and contain minimal sequence derived from a non-human immunoglobulm Humamzation can be performed following the method of Winter and co-workers (Jones ef al, 1986 Nature, 321 522-525, Riechmann et al, 1988 Nature, 332.323-327, Verhoeyen et al, 1988 Science, 239 1534-1536), by substituting rodent CDRs or CDR sequences for the corresponding sequences of a human antibody. (See also U.S. Patent No. 5,225,539 ) In some instances, Fv framework residues of the human immunoglobulm are replaced by corresponding non-human residues Humanized antibodies can also compose residues which are found neither m the recipient antibody nor in the imported CDR or framework sequences In general, the humanized antibody will compose substantially all of at least one, and typically two, vaoable domains, m which all or substantially all of the CDR regions correspond to those of a non-human immunoglobulm and all or substantially all of the framework regions are those of a human immunoglobulm consensus sequence The humanized antibody optimally also will compnse at least a portion of an immunoglobulm constant region (Fc). typically that of a human immunoglobulm (Jones ef al , 1986, Riechmann ef al, 1988; and Presta, 1992 Cuo. Op. Struct. Biol., 2.593-596) 4. Human Antibodies Fully human antibodies essentially relate to antibody molecules m which the entire sequence of both the light chain and the heavy chain, including the CDRs, anse from human genes Such antibodies are termed "human antibodies", or "fully human antibodies" herein Human monoclonal antibodies directed against a FGF-CX protein can be prepared by the tnoma technique: the human B-cell hybndoma technique (see Kozbor. et al, 1983 Immunol Today 4 72) and the EBV hybndoma technique to produce human monoclonal antibodies (see Cole, et al, 1985 In Monoclonal Antibodies and Cancer Therapy, Alan R Liss, Inc., pp 77-96) Human monoclonal antibodies may be utilized in the practice of the present invention and may be produced by using human hybndomas (see Cote, et al, 1983. Proc Natl Acad Sci USA 80 2026-2030) or by transforming human B-cells with Epstein Barr Virus in vitro (see Cole, et al , 1985 In Monoclonal Antibodies and Cancer Therapy, Alan R Liss, Inc., pp. 77-96) In addition, human antibodies can also be produced using additional techniques, including phage display hbraoes (Hoogenboom and Winter, 1991 J. Mol. Biol., 227.381, Marks ef al, 1991 J Mol Biol . 222:581) Similarly, human antibodies can be made by introducing human immunoglobulm loci into transgenic animals, e.g , mice in which the endogenous immunoglobulm genes have been partially or completely inactivated Upon challenge, human antibody production is observed, which closely resembles that seen in humans in all respects, including gene rearrangement, assembly, and antibody repertoire This approach is descnbed, for example, in U S Patent Nos 5,545,807, 5,545,806, 5.569,825, 5,625,126, 5,633,425, 5.661,016, and m Marks et al (1992 Bio/Technology 10. 779-783), Lonberg et al (1994 Nature 368 856-859), Momson (1994 Nature 368, 812-13), Fishwild ef al (1996 Nature Biotechnology 14, 845-51), Neuberger (1996 Nature Biotechnology 14, 826), and Lonberg and Huszar 1995 Intern Rev Immunol 13 65-93) Human antibodies that specifically bind a FGF-CX protein may additionally be produced using transgenic nonhuman animals which are modified so as to produce fully human antibodies rather than the animal's endogenous antibodies in response to challenge by an antigen (See publication WO 94/02602) The endogenous genes encoding the heavy and light immunoglobulm chains in the nonhuman host have been incapacitated, and active loci encoding human heavy and light chain immunoglobulms are inserted into the host's genome The human genes are incorporated, for example, using yeast artificial chromosomes containing the requisite human DNA segments An animal which provides all the desired modifications is then obtained as progeny by crossbreeding intermediate transgenic animals containing fewer than the full complement of the modifications The prefeoed embodiment of such a nonhuman animal is a mouse, and is termed the XenomouseTM as disclosed in PCT publications WO 96/33735 and WO 96/34096 This animal produces B cells which secrete fully human immunoglobulms The antibodies can be obtained directly from the animal after immunization with a FGF-CX immunogen of interest, as, for example, a preparation of a polyclonal antibody, or alternatively from immortalized B cells denved from the animal, such as hybndomas producing monoclonal antibodies Additionally, the genes encoding the immunoglobulms with human vanable regions can be recovered and expressed to obtain the antibodies directly, or can be further modified to obtain analogs of antibodies such as, for example, single chain Fv molecules An example of a method of producing a nonhuman host, exemplified as a mouse, lacking expression of an endogenous immunoglobulm heavy chain is disclosed in U S Patent No 5,939,598 It can be obtained bv a method including deleting the J segment genes from at least one endogenous heavy chain locus in an embryonic stem cell to prevent rearrangement of the locus and to prevent formation of a transcnpt of a rearranged immunoglobulm heavy chain locus, the deletion being effected by a targeting v ector containing a gene encoding a selectable marker, and producing from the embryonic stem cell a transgenic mouse whose somatic and germ cells contain the gene encoding the selectable marker A method for producing an antibody of interest, such as a human antibody, is disclosed in U.S Patent No. 5,916,771. It includes introducing an expression vector that contains a nucleotide sequence encoding a heavy chain into one mammalian host cell in culture, introducing an expression vector containing a nucleotide sequence encoding a light chain into another mammalian host cell, and fusing the two cells to form a hybnd cell The hybod cell expresses an antibody containing the heavy chain and the light chain In a further improvement on this procedure, a method for identifying a clinically relev ant epitope on an immunogen, and a conelative method for selecting an antibody that binds immunospecifically to the relevant epitope with high affinity, are disclosed in PCT publication WO 99/53049 5. Fab Fragments and Single Chain Antibodies According to the invention, techniques can be adapted for the production of single-chain antibodies specific to an antigemc FGF-CX protein of the invention (see e g , U.S Patent No 4,946,778) In addition, methods can be adapted for the construction of Fab expression hbraoes (see e g , Huse, et al, 1989 Science 246- 1275-1281) to allow rapid and effective identification of monoclonal Fab fragments with the desired specificity for a protein or deovatives, fragments, analogs or homologs thereof. Antibody fragments that contain the idiotypes to a protein antigen may be produced by techniques known in the art including, but not limited to (I) an F(ab')2 fragment produced by pepsin digestion of an antibody molecule; (n) an Fab fragment generated by reducing the disulfide bodges of an F(ab')2 fragment, (in) an Fab fragment generated by the treatment of the antibody molecule with papain and a reducing agent and (iv) Fv fragments 6. Bispecific Antibodies Bispecific antibodies are monoclonal, preferably human or humanized, antibodies that have binding specificities for at least two different antigens In the present case, one of the binding specificities is for an antigemc protein of the invention. The second binding target is any other antigen, and advantageously is a cell-surface protein or receptor or receptor subunit. Methods for making bispecific antibodies are known in the art. Traditionally, the recombinant production of bispecific antibodies is based on the co-expression of two immunoglobulm heavy-chain/hght-cham pairs, where the two heavy chains have different specificities (Milstein and Cuello, 1983 Nature, 305-537-539) Because of the random assortment of immunoglobulm heavy and light chains, these hybodomas (quadromas) produce a potential mixture often different antibody molecules, of which only one has the correct bispecific structure The puofication of the correct molecule is usually accomplished by affinity chromatography steps Similar procedures are disclosed in WO 93/08829, published 13 May 1993. and in Traunecker et al , 1991 EMBO J , 10 3655-3659 Antibody vaoable domains with the desired binding specificities (antibody-antigen combining sites) can be fused to immunoglobulm constant domain sequences The fusion preferably is with an immunoglobulm heavy-chain constant domain, composing at least part of the hinge. CH2, and CH3 regions It is preferred to have the first heavy-chain constant region (CHI) containing the site necessary for hght-cham binding present in at least one of the fusions DNAs encoding the immunoglobulm heavy-chain fusions and, if desired, the immunoglobulm light chain, are inserted into separate expression vectors, and are co- transfected into a suitable host organism For further details of generating bispecific antibodies see, for example, Suresh et al . 1986 Methods in Enzymology, 121 210 According to another approach descobed in WO 96/27011 , the interface between a pair of antibody molecules can be engineered to maximize the percentage of heterodimers which are recovered from recombinant cell culture The preferred interface composes at least a part of the CH3 region of an antibody constant domain In this method, one or more small amino acid side chains from the interface of the first antibody molecule are replaced with larger side chains (e g tyrosine or tryptophan) Compensatory "cavities" of identical or similar size to the large side cham(s) are created on the interface of the second antibody molecule by replacing large ammo acid side chains with smaller ones (e g alanine or threomne) This provides a mechanism for increasing the yield of the heterodimer over other unwanted end-products such as homodimers Bispecific antibodies can be prepared as full length antibodies or antibody fragments (e g F(ab')2 bispecific antibodies) Techniques for generating bispecific antibodies from antibody fragments have been descobed m the literature For example, bispecific antibodies can be prepared using chemical linkage Brennan et al , 1985 Science 229 81 descobe a procedure wherein intact antibodies are proteolytically cleaved to generate F(ab')2 fragments These fragments are reduced in the presence of the dithiol complexmg agent sodium arsenite to stabilize vicinal dithiols and prevent lntermolecular disulfide formation The Fab' fragments generated are then converted to thionitrobenzoate (TNB) denvatives One of the Fab'-TNB denvatives is then reconverted to the Fab '-thiol by reduction with mercaptoethylamine and is mixed with an equimolar amount of the other Fab'-TNB deovative to form the bispecific antibodv The bispecific antibodies produced can be used as agents for the selective immobilization of enzymes Additionally, Fab' fragments can be directly recovered from E coli and chemically coupled to form bispecific antibodies Shalaby ef al , 1992 J Exp Med 175 217-225 descnbe the production of a fullv humanized bispecific antibody F(ab')2 molecule Each Fab' fragment was separatelv secreted from E coli and subjected to directed chemical coupling in vitro to form the bispecific antibody The bispecific antibody thus formed was able to bind to cells overexpressing the ErbB2 receptor and normal human T cells, as well as togger the lytic activity of human cytotoxic lymphocytes against human breast tumor targets Vaoous techniques for making and isolating bispecific antibody fragments directly from recombinant cell culture have also been descobed For example, bispecific antibodies have been produced using leucine zippers Kostelny et al , 1992 J Immunol 148(5) 1547-1553 The leucine zipper peptides from the Fos and Jun proteins were linked to the Fab' portions of two different antibodies by gene fusion The antibody homodimers were reduced at the hmge region to form monomers and then re-oxidized to form the antibody heterodimers This method can also be utilized for the production of antibody homodimers The "diabody" technology descobed by Holhnger ef α/ , 1993 Proc Natl Acad Sci USA 90 6444-6448, has provided an alternative mechanism for making bispecific antibody fragments The fragments compose a heavy-chain vaoable domain (VH) connected to a hght-cham vaoable domain (NL) by a linker which is too short to allow paiong between the two domains on the same chain Accordingly, the VH and VL domains of one fragment are forced to pair with the complementary VL and VH domains of another fragment, thereby forming two antigen-bindmg sites Another strategy for making bispecific antibody fragments by the use of single-chain Fv (sFv) dimers has also been reported See, Gruber et al , 1994 J Immunol 152 5368 Antibodies with more than two valencies are contemplated For example, tospecific antibodies can be prepared Tutt et al , 1991 J Immunol 147 60 Exemplary bispecific antibodies can bind to two different epitopes, at least one of which onginates in the protein antigen of the invention Alternatively, an anti-antigemc arm of an immunoglobulm molecule can be combined with an arm which binds to a toggeong molecule on a leukocyte such as a T-cell receptor molecule (e g CD2, CD3, CD28, or B7), or Fc receptors for IgG (FcγR). such as FcγRI (CD64), FcγRLI (CD32) and FcγRIII (CD 16) so as to focus cellular defense mechanisms to the cell expressing the particular antigen Bispecific antibodies can also be used to direct cytotoxic agents to cells which express a particular antigen These antibodies possess an antigen-bmding arm and an arm which binds a cytotoxic agent or a radionuchde chelator, such as EOTUBE. DPTA, DOTA, or TETA Another bispecific antibody of interest binds the protein antigen descobed herein and further binds tissue factor (TF) 7. Heteroconjugate Antibodies Heteroconjugate antibodies are also within the scope of the present invention Heteroconjugate antibodies are composed of two covalently joined antibodies Such antibodies have, for example, been proposed to target immune system cells to unwanted cells (U S Patent No 4,676,980), and for treatment of HIV infection (WO 91/00360, WO 92/200373, EP 03089) It is contemplated that the antibodies can be prepared in vitro using known methods in synthetic protein chemistry, including those involving crosslmkmg agents For example, lmmunotoxins can be constructed using a disulfide exchange reaction or by forming a thioether bond Examples of suitable reagents for this purpose include immothiolate and methyl-4-mercaptobutyomιdate and those disclosed, for example, in U S Patent No 4,676,980 8. Effector Function Engineering It can be desirable to modify the FGF-CX antibody of the invention with respect to effector function, so as to enhance, e g , the effectiveness of the antibody m treating cancer For example, cysteine resιdue(s) can be introduced into the Fc region, thereby allowing interchain disulfide bond formation in this region The homodimenc antibody thus generated can have improved internalization capability and/or increased complement-mediated cell killing and antibody-dependent cellular cytotoxicity (ADCC) See Caron et al . 1992 J Exp Med , 176 1191-1195, Shopes, 1992 J Immunol , 148 2918-2922 Homodimeoc antibodies with enhanced anti-tumor activity can also be prepared using heterobifunctional cross-linkers as descobed in Wolff ef al 1993 Cancer Research, 53 2560-2565 Alternatively, an antibody can be engineered that has dual Fc regions and can thereby have enhanced complement lysis and ADCC capabilities See Stevenson et al , 1989 Anti-Cancer Drug Design, 3 219-230 9. Immunoconjugates The invention also pertains to immunoconjugates composing a FGF-CX antibody conjugated to a cytotoxic agent such as a chemotherapeutic agent, toxm (e g , an enzymatically active toxin of bactenal, fungal, plant, or animal ongm, or fragments thereof), or a radioactive isotope (ι e , ?L radioconjugate) Chemotherapeutic agents useful in the generation of such immunoconjugates have been descnbed above Enzymatically active toxms and fragments thereof that can be used include diphtheria A chain, nonbmdmg active fragments of diphthena toxm, exotoxin A chain (from Pseudomonas aeruginosa), πcin A chain, abnn A chain, modeccin A chain, alpha-sarcm, Aleuntes fordu proteins, dianthm proteins, Phytolaca amencana proteins (PAPI, PAPII. and PAP-S), momordica charantia inhibitor, curcin, crotin, sapaonaoa officmalis inhibitor, gelonin, mitogellm, restoctocm, phenomycm, enomycm, and the tocothecenes A vaoety of radionuchdes are available for the production of radioconjugated antibodies Examples include 212Bι, 1311, 131In, 90Y, and 186Re Conjugates of the antibody and cytotoxic agent are made using a vanety of bifunctional protem-couplmg agents such as N-succmιmιdyl-3-(2-pyodyldιthιol) propionate (SPDP), lmmofhiolane (IT), bifunctional deovatives of lmidoesters (such as dimethyl adipimidate HCL), active esters (such as disuccmimidyl suberate), aldehydes (such as glutareldehyde), bis-azido compounds (such as bis (p-azidobenzoyl) hexanediamme), bis- diazomum deovatives (such as bιs-(p-dιazonιumbenzoyl)-ethylenedιamme), dnsocyanates (such as tolyene 2,6-dnsocyanate), and bis-active fluoone compounds (such as 1,5-dιfluoro- 2,4-dmιtrobenzene) For example, a ocm immunotoxm can be prepared as descobed in Vitetta et al , Science, 238 1098 (1987) Carbon- 14-labeled l-ιsothιocyanatobenzyl-3- methyldiethylene toammepentaacetic acid (MX-DTPA) is an exemplary chelatmg agent for conjugation of radionucleotide to the antibody See W094/11026 In another embodiment, the antibody can be conjugated to a "receptor" (such streptavidin) for utilization m tumor pretargetmg wherein the antibody-receptor conjugate is administered to the patient, followed by removal of unbound conjugate from the circulation using a cleaong agent and then administration of a "ligand" (e g , avidm) that is in turn conjugated to a cytotoxic agent 10. Immunoliposomes The antibodies disclosed herein can also be formulated as immunoliposomes Liposomes containing the antibody are prepared by methods known in the art, such as descobed in Epstein et al , 1985 Proc Natl Acad Sci USA, 82 3688, Hwang ef al , 1980 Proc Natl Acad Sci USA, 77 4030, and U S Pat Nos 4,485,045 and 4,544,545 Liposomes with enhanced circulation time are disclosed in U S Patent No 5,013,556 Particularly useful liposomes can be generated by the reverse-phase evaporation method with a lipid composition composing phosphatidylcholme, cholesterol, and PEG- deovatized phosphatidylethanolamine (PEG-PE) Liposomes are extruded through filters of defined pore size to yield liposomes with the desired diameter Fab' fragments of the antibody of the present invention can be conjugated to the liposomes as descobed in Martm et al , 1982 J Biol Chem , 257 286-288 via a disulfide-mterchange reaction A chemotherapeutic agent (such as Doxorubicm) is optionally contained within the hposome See Gabizon ef al , 1989 J National Cancer Inst , 81(19) 1484 11. Diagnostic Applications of Antibodies Directed Against FGF-CX Antibodies directed against a FGF-CX protein of the invention may be used in methods known withm the art relating to the localization and/or quantitation of the protein (e g , for use in measuong levels of the protein within appropoate physiological samples, for use in diagnostic methods, for use in imaging the protein, and the like) In a given embodiment, antibodies against the proteins, or deovatives. fragments, analogs or homologs thereof, that contain the antigen binding domain, are utilized as pharmacologically-active compounds (see below) An antibody specific for a FGF-CX protein of the invention can be used to isolate the protein by standard techniques, such as immuno affinity chromatography or immunoprecipitation Such an antibody can facilitate the punfication of the natural protein antigen from cells and of recombinantly produced antigen expressed in host cells Moreover, such an antibody can be used to detect the antigemc protein (e g , in a cellular lysate or cell supernatant) m order to evaluate the abundance and pattern of expression of the antigemc protein Antibodies directed against the FGF-CX protein can be used diagnostically to monitor protein levels m tissue as part of a clinical testing procedure, e g , to, for example, determine the efficacy of a given treatment regimen Detection can be facilitated by coupling (i e , physically linking) the antibody to a detectable substance Examples of detectable substances include vanous enzymes prosthetic groups, fluorescent matenals, luminescent matenals, biolummescent matenals, and radioactive matenals Examples of suitable enzymes include horseradish peroxidase, alkaline phosphatase, β-galactosidase, or acetylcholmesterase, examples of suitable prosthetic group complexes include streptavidm/biotm and avidm/biotm, examples of suitable fluorescent matenals include umbelhferone, fluorescein, fluorescein isothiocyanate, rhodamme, dichlorotoazinylamine fluorescein, dansyl chloode or phycoerython, an example of a luminescent mateoal includes luminol, examples of biolummescent matenals include luciferase, lucifeon, and aequoon, and examples of suitable radioactive mateoal include 12 1, lj l I, 33 S or Η 12. Antibodv Therapeutics FGF-CX antibodies of the invention, including polyclonal, monoclonal, humanized and fully human antibodies, may used as therapeutic agents Such agents will generally be employed to treat or prev ent a disease or pathology m a subject An antibody preparation, preferably one having high specificity and high affinity for its target antigen, is administered to the subject and will generally have an effect due to its binding with the target Such an effect may be one of two kinds, depending on the specific nature of the interaction between the given antibody molecule and the target antigen in question In the first instance, administration of the antibody may abrogate or inhibit the binding of the target with an endogenous ligand to which it naturally binds In this case, the antibody binds to the target and masks a binding site of the naturally occumng ligand, wherem the ligand serves as an effector molecule Thus the receptor mediates a signal transduction pathway for which ligand is responsible Alternatively, the effect may be one in which the antibody elicits a physiological result by virtue of binding to an effector binding site on the target molecule In this case the target, a receptor having an endogenous ligand which may be absent or defective in the disease or pathology, binds the antibody as a surrogate effector ligand, initiating a receptor-based signal transduction event by the receptor A therapeuticallv effective amount of an antibody of the invention relates generally to the amount needed to achieve a therapeutic objective As noted above, this may be a binding interaction between the antibody and its target antigen that, in certain cases, interferes with the functioning of the target, and m other cases, promotes a physiological response The amount required to be administered w ill furthermore depend on the binding affinity of the antibody for its specific antigen, and will also depend on the rate at which an administered antibody is depleted from the free volume other subject to which it is administered Common ranges for therapeutically effective dosing of an antibody or antibody fragment of the invention may be, by way of nonlimitmg example, from about 0 1 mg/kg body weight to about 50 mg/kg body weight Common dosing frequencies may range, for example, from twice daily to once a week 13. Pharmaceutical Compositions of Antibodies Antibodies specifically binding a FGF-CX protein of the invention, as well as other molecules identified by the screening assays disclosed herein, can be administered for the treatment of vanous disorders in the form of pharmaceutical compositions. Pnnciples and considerations involved in prepanng such compositions, as well as guidance in the choice of components are provided, for example, in Remington The Science And Practice Of Pharmacy 19th ed (Alfonso R. Gennaro. et al, editors) Mack Pub. Co , Easton. Pa.: 1995, Drug Absorption Enhancement Concepts, Possibilities, Limitations, And Trends, Harwood Academic Publishers, Langhorne. Pa., 1994, and Peptide And Protein Drug Delivery (Advances In Parenteral Sciences, Vol 4). 1991, M. Dekker, New York. If the antigemc protein is intracellular and whole antibodies are used as inhibitors, internalizing antibodies are preferred However, liposomes can also be used to deliver the antibody, or an antibody fragment, into cells. Where antibody fragments are used, the smallest inhibitory fragment that specifically binds to the binding domain of the target protein is preferred For example, based upon the vanable-region sequences of an antibody, peptide molecules can be designed that retain the ability to bind the target protein sequence. Such peptides can be synthesized chemically and or produced by recombinant DNA technology. See, e.g., Marasco ef al, 1993 Proc Natl. Acad. Sci. USA, 90: 7889-7893. The formulation herein can also contain more than one active compound as necessary for the particular indication being treated, preferably those with complementary activities that do not adversely affect each other. Alternatively, or m addition, the composition can compose an agent that enhances its function, such as, for example, a cytotoxic agent, cytokine, chemotherapeutic agent, or growth-inhibitory agent. Such molecules are suitably present in combination in amounts that are effective for the purpose intended The active ingredients can also be entrapped in microcapsules prepared, for example, by coacervation techniques or by interfacial polymeozation, for example, hydroxymethylcellulose or gelatm-microcapsules and poly-(methylmethacrylate) microcapsules, respectively, in colloidal drug delivery systems (for example, liposomes, albumin microspheres, microemulsions, nano-particles. and nanocapsules) or in macroemulsions The formulations to be used for in vivo administration must be steole. This is readily accomplished by filtration through steole filtration membranes. FGF-CX Recombinant Expression Vectors and Host Cells .Another aspect of the invention pertains to vectors, preferably expression vectors, containing a nucleic acid encoding FGF-CX protein, or denvatives, fragments, analogs or homologs thereof As used herein, the term "vector" refers to a nucleic acid molecule capable of transporting another nucleic acid to which it has been linked One type of vector is a "plasmid". which refers to a circular double stranded DNA loop into which additional DNA segments can be ligated .Another type of vector is a viral vector, wherem additional DNA segments can be ligated into the viral genome. Certain vectors are capable of autonomous replication in a host cell into which they are introduced (e g , bacteoal vectors having a bacteoal oogin of replication and episomal mammalian vectors) Other vectors (e g., non-episomal mammalian vectors) are integrated into the genome of a host cell upon introduction into the host cell, and thereby are replicated along with the host genome. Moreover, certain vectors are capable of directing the expression of genes to which they are operatively linked. Such vectors are referred to herein as "expression vectors" In general, expression vectors of utility in recombinant DNA techniques are often m the form of plasmids. In the present specification, "plasmid" and "vector" can be used interchangeably as the plasmid is the most commonly used form of vector. However, the invention is intended to include such other forms of expression vectors, such as viral vectors (e g , replication defective retroviruses, adenoviruses and adeno-associated viruses), which serve equivalent functions. The recombinant expression vectors of the invention compose a nucleic acid of the invention in a form suitable for expression of the nucleic acid m a host cell, which means that the recombinant expression vectors include one or more regulatory sequences, selected on the basis of the host cells to be used for expression, that is operatively linked to the nucleic acid sequence to be expressed Withm a recombinant expression vector, "operably linked" is intended to mean that the nucleotide sequence of interest is linked to the regulatory sequence(s) m a manner that allows for expression of the nucleotide sequence (e g., m an in vitro transcnption/translation system or in a host cell when the vector is introduced into the host cell) The term "regulatory sequence" is intended to includes promoters, enhancers and other expression control elements (e g , polyadenylation signals) Such regulatory sequences are descnbed, for example, m Goeddel, 1990 GENE EXPRESSION TECHNOLOGY METHODS IN ENZV MOLOGY 185, Academic Press, San Diego, Calif Regulatory sequences include those that direct constitutive expression of a nucleotide sequence in many types of host cell and those that direct expression of the nucleotide sequence only in certain host cells (e g., tissue-specific regulators sequences) It will be appreciated by those skilled m the art that the design of the expression vector can depend on such factors as the choice of the host cell to be transformed, the level of expression of protein desired, etc The expression vectors of the invention can be introduced into host cells to thereby produce proteins or peptides, including fusion proteins or peptides, encoded by nucleic acids as descnbed herein (e g , FGF-CX proteins, mutant forms of FGF-CX, fusion proteins, etc ) The recombinant expression vectors of the invention can be designed for expression of FGF-CX in prokaryotic or eukaryotic cells For example, FGF-CX can be expressed in bactenal cells such as E coli, insect cells (using baculovirus expression vectors) yeast cells or mammalian cells Suitable host cells are discussed further in Goeddel, 1990 GENE EXPRESSION TECHNOLOGY METHODS IN ENZYMOLOGY 185, Academic Press, San Diego, Calif Alternatively, the recombinant expression vector can be transcnbed and translated in vitro, for example using T7 promoter regulatory sequences and T7 polymerase Expression of proteins in prokaryotes is most often earned out in E coli with vectors containing constitutive or inducible promoters directing the expression of either fusion or non- fusion proteins Fusion vectors add a number of ammo acids to a protein encoded therein, usually to the ammo terminus of the recombinant protein Such fusion vectors typically serve three purposes (1) to increase expression of recombinant protein, (2) to increase the solubility of the recombinant protein, and (3) to aid in the punfication of the recombinant protein by acting as a ligand in affinity punfication Often, in fusion expression vectors, a proteolytic cleavage site is introduced at the junction of the fusion moiety and the recombinant protein to enable separation of the recombinant protein from the fusion moiety subsequent to punfication of the fusion protein Such enzymes, and their cognate recognition sequences, include Factor Xa, thrombin and enterokinase Typical fusion expression vectors include pGEX (Pharmacia Biotech Inc, Smith and Johnson (1988) Gene 67 31-40), pMAL (New England Biolabs, Beverly, Mass ) and pRIT5 (Pharmacia, Piscataway, N J ) that fuse glutathione S-transferase (GST), maltose E binding protein, or protein A, respectively, to the target recombinant protein Examples of suitable inducible non- fusion E coli expression vectors include pTrc (Amrann et al , (1988) Gene 69 301-315) and pET 1 Id (Studier ef al , 1990 GENE EXPRESSION TECHNOLOGY METHODS IN ENZYMOLOGY 185. Academic Press, San Diego, Calif 60-89) One strategy to maximize recombinant protein expression in E coli is to express the protein in a host bacteoa with an impaired capacity to proteolytically cleave the recombinant protein See, Gottesman, 1990 GENE EXPRESSION TECHNOLOGY METHODS IN ENZYMOLOGY 185. Academic Press, San Diego, Calif 119-128 Another strategy is to alter the nucleic acid sequence of the nucleic acid to be inserted into an expression vector so that the individual codons for each ammo acid are those preferentially utilized m E coli (Wada et al , 1992 Nucleic Acids Res 20 2111-2118) Such alteration of nucleic acid sequences of the invention can be earned out by standard DNA synthesis techniques In another embodiment, the FGF-CX expression vector is a yeast expression vector Examples of vectors for expression in yeast S cerivisae include pYepSecl (Baldan, et al , (1987) EMBO J6 229-234), pMFa (Kuoan and Herskowitz. 1982 Cell 30 933-943), pJRY88 (Schultz et al , 1987 Gene 54 113-123), pYES2 (Invitrogen Corporation, San Diego, Calif ), and picZ (InVitrogen Corp, San Diego, Calif ) Alternatively, FGF-CX can be expressed in insect cells using baculovirus expression vectors Baculovirus vectors available for expression of proteins in cultured insect cells (e g , SF9 cells) include the pAc seoes (Smith et al 1983 Mol Cell Biol 3 2156-2165) and the pVL seoes (Lucklow and Summers 1989 Virology 170 31-39) In yet another embodiment, a nucleic acid of the invention is expressed in mammalian cells using a mammalian expression vector Examples of mammalian expression vectors include pCDM8 (Seed (1987) hature 329 840) and pMT2PC (Kaufman et al 1987 EMBO J 6 187-195) When used in mammalian cells, the expression vector's control functions are often provided by viral regulatory elements For example, commonly used promoters are deoved from polyoma. Adenovirus 2, cytomegalovirus and Simian Virus 40 For other suitable expression systems for both prokaryotic and eukaryotic cells See, e g , Chapters 16 and 17 of Sambrook ef al MOLECULAR CLONING A L ABORATORY MANUAL 2nd ed , Cold Spring Harbor Laboratory, Cold Spong Harbor Laboratory Press, Cold Spong Harbor, N Y , 1989 In another embodiment, the recombinant mammalian expression vector is capable of directing expression of the nucleic acid preferentially m a particular cell type (e g , tissue-specific regulator/ elements are used to express the nucleic acid) Tissue-specific regulatory elements are known m the art Non-limiting examples of suitable tissue-specific promoters include the albumin promoter (liver-specific, Pmkert et al 1987 Genes Dev 1 268-277), lymphoid-specific promoters (Calame and Eaton 1988 Adv Immunol 43 235-275), in particular promoters of T cell receptors (Winoto and Baltimore 1989 EMBO J 8 729-733) and immunoglobulms (Banerji ef al 1983 Cell 33 729-740, Queen and Baltimore 1983 Cell 33 741-748), neuron-specific promoters (e g , the neurofilament promoter, Byrne and Ruddle 1989 PNAS 86:5473-5477), pancreas-specific promoters (Edlund ef al. 1985 Science 230. 912-916), and mammary gland-specific promoters (e g , milk whey promoter; U S. Pat. No. 4,873,316 and European Application Publication No. 264,166) Developmentally-regulated promoters are also encompassed, e g , the muone hox promoters (Kessel and Gruss 1990 Science 249 374-379) and the α-fetoprotem promoter (Campes and Tilghman 1989 Genes Dev 3 537-546) The invention further provides a recombinant expression vector composing a DNA molecule of the invention cloned into the expression vector in an antisense ooentation That is, the DNA molecule is operatively linked to a regulatory sequence in a manner that allows for expression (by transcoption of the DNA molecule) of an RNA molecule that is antisense to FGF-CX mRNA Regulatory sequences operatively linked to a nucleic acid cloned m the antisense ooentation can be chosen that direct the continuous expression of the antisense RNA molecule m a vaoety of cell types, for instance viral promoters and/or enhancers, or regulatory sequences can be chosen that direct constitutive, tissue specific or cell type specific expression of antisense RNA The antisense expression vector can be in the form of a recombinant plasmid, phagemid or attenuated virus in which antisense nucleic acids are produced under the control of a high efficiency regulatory region, the activity of which can be determined by the cell type into which the vector is introduced For a discussion of the regulation of gene expression using antisense genes see Wemtraub et al, "Antisense RNA as a molecular tool for genetic analysis," Reviews—Trends in Genetics, Vol 1(1) 1986 Another aspect of the invention pertains to host cells into which a recombinant expression vector of the invention has been introduced The terms "host cell" and "recombinant host cell" are used interchangeably herein It is understood that such terms refer not only to the particular subject cell but to the progeny or potential progeny of such a cell. Because certain modifications may occur in succeeding generations due to either mutation or environmental influences, such progeny may not, in fact, be identical to the parent cell, but are still included within the scope of the term as used herein. A host cell can be any prokaryotic or eukaryotic cell. For example, FGF-CX protein can be expressed m bacterial cells such as E coli, insect cells, yeast or mammalian cells (such as Chinese hamster ovary cells (CHO) or COS cells) Other suitable host cells are known to those skilled m the art Vector DNA can be introduced into prokaryotic or eukaryotic cells via conventional transformation or transfection techniques As used herein, the terms "transformation" and "transfection" are intended to refer to a vaoety of art-recognized techniques for introducing foreign nucleic acid (e g . DNA) into a host cell, including calcium phosphate or calcium chloode co-precipitation. DEAE-dextran-mediated transfection, hpofection, or electroporation. Suitable methods for transforming or transfecting host cells can be found in Sambrook, et al (MOLECLLΛR CLONING A. LABORATORY M NLAL 2nd ed., Cold Spong Harbor Laboratory, Cold Spong Harbor Laboratory Press, Cold Spong Harbor, N Y , 1989), and other laboratory manuals For stable transfection of mammalian cells, it is known that, depending upon the expression vector and transfection technique used, only a small fraction of cells may integrate the foreign DNA into their genome In order to identify and select these integrants, a gene that encodes a selectable marker (e g , resistance to antibiotics) is generally introduced into the host cells along with the gene of interest Vaoous selectable markers include those that confer resistance to drugs, such as G418, hygromycin and methotrexate. Nucleic acid encoding a selectable marker can be introduced into a host cell on the same vector as that encoding FGF- CX or can be introduced on a separate vector Cells stably transfected with the introduced nucleic acid can be identified by drug selection (e g , cells that have incorporated the selectable marker gene will survive, while the other cells die). A host cell of the invention, such as a prokaryotic or eukaryotic host cell in culture, can be used to produce (i e , express) FGF-CX protein Accordingly, the invention further provides methods for producing FGF-CX protein using the host cells of the invention In one embodiment, the method composes cultuong the host cell of invention (into which a recombinant expression vector encoding FGF-CX has been introduced) in a suitable medium such that FGF-CX protein is produced In another embodiment, the method further composes isolating FGF-CX from the medium or the host cell Transgenic animals The host cells of the invention can also be used to produce nonhuman transgenic animals For example, in one embodiment, a host cell of the invention is a fertilized oocyte or an embryonic stem cell into which FGF-CX-codmg sequences have been introduced. Such host cells can then be used to create non-human transgenic animals in which exogenous FGF- CX sequences have been introduced into their genome or homologous recombinant animals m which endogenous FGF-CX sequences have been altered Such animals are useful for studying the function and/or activity of FGF-CX and for identifying and/or evaluating modulators of FGF-CX activity As used herein, a "transgenic animal" is a non-human animal, preferably a mammal, more preferably a rodent such as a rat or mouse, in which one or more of the cells of the animal includes a transgene Other examples of transgenic animals include non-human pomates, sheep, dogs, cows, goats, chickens, amphibians, etc A transgene is exogenous DNA that is integrated into the genome of a cell from which a transgenic animal develops and that remains in the genome of the mature animal, thereby directing the expression of an encoded gene product in one or more cell types or tissues of the transgenic animal As used herein, a "homologous recombinant animal" is a non-human animal, preferably a mammal, more preferably a mouse, in which an endogenous FGF-CX gene has been altered by homologous recombination between the endogenous gene and an exogenous DNA molecule introduced into a cell of the animal, e g , an embryonic cell of the animal, poor to development of the animal A transgenic animal of the invention can be created by introducing FGF-CX-encodmg nucleic acid into the male pronuclei of a fertilized oocyte, e g , by microinjection, retroviral infection, and allowing the oocyte to develop in a pseudopregnant female foster animal The human FGF-CX DNA sequence of SEQ ID NO 1 can be introduced as a transgene into the genome of a non-human animal Alternatively, a nonhuman homologue of the human FGF- CX gene, such as a mouse FGF-CX gene, can be isolated based on hybodization to the human FGF-CX cDNA (descobed further above) and used as a transgene Intronic sequences and polyadenylation signals can also be included m the transgene to increase the efficiency of expression of the transgene A tissue-specific regulatory sequence(s) can be operably linked to the FGF-CX transgene to direct expression of FGF-CX protein to particular cells Methods for generating transgenic animals via embryo manipulation and microinjection, particularly animals such as mice, have become conventional in the art and are descobed, for example, in U S Pat Nos 4,736,866, 4,870,009, and 4,873,191, and Hogan 1986, In MANIPULATING THE MOUSE EMBRYO, Cold Spong Harbor Laboratory Press, Cold Spong Harbor, N Y Similar methods are used for production of other transgenic animals A transgenic founder animal can be identified based upon the presence of the FGF-CX transgene m its genome and/or expression of FGF-CX mRNA in tissues or cells of the animals A transgenic founder animal can then be used to breed additional animals carrying the transgene Moreover, transgenic animals carrying a transgene encoding FGF-CX can further be bred to other transgenic animals carrying other transgenes To create a homologous recombinant animal, a vector is prepared which contains at least a portion of a FGF-CX gene into which a deletion, addition or substitution has been introduced to thereby alter, e g , functionally disrupt, the FGF-CX gene The FGF-CX gene can be a human gene (e g , SEQ ID NO 1), but more preferably, is a non-human homologue of a human FGF-CX gene For example, a mouse homologue of human FGF-CX gene of SEQ ID NO 1 can be used to construct a homologous recombination vector suitable for altenng an endogenous FGF-CX gene m the mouse genome In one embodiment, the vector is designed such that, upon homologous recombination, the endogenous FGF-CX gene is functionally disrupted (i e . no longer encodes a functional protein, also refened to as a "knock out" vector) Alternatively, the vector can be designed such that, upon homologous recombination, the endogenous FGF-CX gene is mutated or otherwise altered but still encodes functional protein (e g , the upstream regulatory region can be altered to thereby alter the expression of the endogenous FGF-CX protein) In the homologous recombination vector, the altered portion of the FGF-CX gene is flanked at its 5' and 3' ends by additional nucleic acid of the FGF-CX gene to allow for homologous recombination to occur between the exogenous FGF- CX gene earned by the vector and an endogenous FGF-CX gene in an embryonic stem cell The additional flanking FGF-CX nucleic acid is of sufficient length for successful homologous recombination with the endogenous gene Typically, several kilobases of flanking DNA (both at the 5' and 3' ends) are included in the vector See e g , Thomas ef al 1987 Cell 51 503 for a descoption of homologous recombination vectors The vector is introduced into an embryonic stem cell line (e g , by electroporation) and cells in which the introduced FGF-CX gene has homologously recombined with the endogenous FGF-CX gene are selected (see e g , Li et al 1992 Cell 69 915) The selected cells are then injected into a blastocyst of an animal (e g , a mouse) to form aggregation chimeras See e g , Bradley 1987, In TERATOCARCINOMAS AND EMBRYONIC STEM CELLS A PRACTIC L APPROACH, Robertson, ed IRL, Oxford, pp 1 13-152 A chimeoc embryo can then be implanted into a suitable pseudopregnant female foster animal and the embryo brought to term Progeny harboong the homologously recombined DNA in their germ cells can be used to breed animals in which all cells of the animal contain the homologously recombined DNA by germhne transmission of the transgene Methods for constructing homologous recombination v ectors and homologous recombinant animals are descobed further m Bradley 1991 Cuir Opin Biotechnol 2 823-829, PCT International Publication Nos WO 90/11354, WO 91/01 140. WO 92/0968, and WO 93/04169 In another embodiment, transgenic non-humans animals can be produced that contain selected systems that allow for regulated expression of the transgene One example of such a system is the cre/loxP recombmase system of bactenophage PI For a descnption of the cre/loxP recombmase system, see. e g , Lakso ef al 1992 PNAS 89 6232-6236 Another example of a recombmase system is the FLP recombmase system of Saccharomyces cerevisiae (O'Gorman et al 1991 Science 251 1351-1355 If a cre/loxP recombmase system is used to regulate expression of the transgene, animals containing transgenes encoding both the Cre recombmase and a selected protein are required Such animals can be provided through the construction of "double" transgenic animals, e g , by mating two transgenic animals, one containing a transgene encoding a selected protein and the other containing a transgene encoding a recombmase Clones of the non-human transgenic animals descnbed herein can also be produced according to the methods descnbed in Wilmut et al 1997 Nature 385 810-813 In bnef, a cell, e g , a somatic cell, from the transgenic animal can be isolated and induced to exit the growth cycle and enter Go phase The quiescent cell can then be fused, e g , through the use of electncal pulses, to an enucleated oocyte from an animal of the same species from which the quiescent cell is isolated The reconstructed oocyte is then cultured such that it develops to morula or blastocyte and then transfeoed to pseudopregnant female foster animal The offspnng borne of this female foster animal will be a clone of the animal from which the cell, e g , the somatic cell, is isolated Pharmaceutical Compositions The FGF-CX nucleic acid molecules, FGF-CX proteins, and anti-FGF-CX antibodies (also referred to herein as "active compounds") of the invention, and denvatives, fragments, analogs and homologs thereof, can be incorporated into pharmaceutical compositions suitable for administration Such compositions typically compose the nucleic acid molecule, protein, or antibody and a pharmaceutically acceptable earner As used herein, "pharmaceutically acceptable earner" is intended to include any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, and the like, compatible with pharmaceutical administration Suitable earners are descobed in the most recent edition of Remington's Pharmaceutical Sciences, a standard reference text in the field, which is incorporated herein by reference Preferred examples of such earners or diluents include, but are not limited to, water, saline, Ringer's solutions, dextrose solution, and 5% human serum albumin Liposomes and non-aqueous vehicles such as fixed oils may also be used The use of such media and agents for pharmaceutically active substances is well known in the art Except insofar as any conventional media or agent is incompatible with the active compound, use thereof in the compositions is contemplated Supplementary active compounds can also be incorporated into the compositions A pharmaceutical composition of the invention is formulated to be compatible with its intended route of administration Examples of routes of administration include parenteral, e g , intravenous, lntradermal, subcutaneous, oral (e g , inhalation), transdermal (topical), transmucosal, and rectal administration Solutions or suspensions used for parenteral, mtradermal, or subcutaneous application can include the following components a stenle diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycenne, propylene glycol or other synthetic solvents, antibactenal agents such as benzyl alcohol or methvl parabens, antioxidants such as ascorbic acid or sodium bisulfite, chelatmg agents such as ethvlenediammetetraacetic acid, buffers such as acetates, citrates or phosphates, and agents for the adjustment of tomcity such as sodium chloode or dextrose The pH can be adjusted with acids or bases, such as hydrochlooc acid or sodium hydroxide The parenteral preparation can be enclosed in ampoules, disposable syonges or multiple dose vials made of glass or plastic Pharmaceutical compositions suitable for injectable use include steole aqueous solutions (where water soluble) or dispersions and steole powders for the extemporaneous preparation of steole injectable solutions or dispersion For intravenous administration, suitable carriers include physiological saline, bacteoostatic water, Cremophor EL™ (BASF, Parsippany, N J ) or phosphate buffered saline (PBS) In all cases, the composition must be steole and should be fluid to the extent that easy syongeabihty exists It must be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms such as bactena and fungi The earner can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyethylene glycol, and the like), and suitable mixtures thereof The proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants Prevention of the action of microorganisms can be achieved by vanous antibactenal and antifungal agents, for example, parabens, chlorobutanol, phenol, ascorbic acid, thimerosal, and the like In many cases, it will be preferable to include isotonic agents, for example, sugars, polyalcohols such as manitol, sorbitol, sodium chlonde m the composition Prolonged absorption of the injectable compositions can be brought about by including in the composition an agent which delays absorption, for example, aluminum monostearate and gelatin Steole injectable solutions can be prepared by incorporating the active compound (e g , a FGF-CX protein or anti-FGF-CX antibody) in the required amount in an appropoate solvent with one or a combination of ingredients enumerated above, as required, followed by filtered steohzation Generally, dispersions are prepared by incorporating the active compound into a steole vehicle that contains a basic dispersion medium and the required other ingredients from those enumerated above In the case of stenle powders for the preparation of stenle injectable solutions, methods of preparation are vacuum drying and freeze-drymg that yields a powder of the active ingredient plus any additional desired ingredient from a previously stenle- filtered solution thereof Oral compositions generally include an inert diluent or an edible earner They can be enclosed in gelatin capsules or compressed into tablets For the purpose of oral therapeutic administration, the active compound can be incorporated with excipients and used in the form of tablets, troches, or capsules Oral compositions can also be prepared using a fluid earner for use as a mouthwash, wherein the compound m the fluid earner is applied orally and swished and expectorated or swallowed Pharmaceutically compatible binding agents, and/or adjuvant matenals can be included as part of the composition The tablets, pills, capsules, troches and the like can contain any of the following ingredients, or compounds of a similar nature a binder such as microcrystalhne cellulose, gum tragacanth or gelatin, an excipient such as starch or lactose, a disintegrating agent such as algmic acid, Pnmogel, or corn starch, a lubncant such as magnesium stearate or Sterotes, a ghdant such as colloidal silicon dioxide, a sweetening agent such as sucrose or sacchann, or a flavonng agent such as peppermint, methyl sa cylate, or orange flavoring For administration by inhalation, the compounds are delivered in the form of an aerosol spray from pressured container or dispenser which contains a suitable propellant, e g , a gas such as carbon dioxide, or a nebulizer Systemic administration can also be by transmucosal or transdermal means For transmucosal or transdermal administration, penetrants appropoate to the bamer to be permeated are used in the formulation Such penetrants are generally known in the art, and include, for example, for transmucosal administration, detergents, bile salts, and fusidic acid deovatives Transmucosal administration can be accomplished through the use of nasal sprays or suppositooes For transdermal administration, the active compounds are formulated into ointments, salves, gels, or creams as generally known m the art The compounds can also be prepared in the form of suppositooes (e g , with conventional suppository bases such as cocoa butter and other glyceodes) or retention enemas for rectal delivery In one embodiment, the activ e compounds are prepared with earners that will protect the compound against rapid elimination from the body, such as a controlled release formulation, including implants and microencapsulated delivery systems Biodegradable, biocompatible polymers can be used, such as ethylene vinyl acetate, polyanhydrides, polyglycolic acid, collagen, polvorthoesters, and polylactic acid Methods for preparation of such formulations will be apparent to those skilled in the art The mateoals can also be obtained commercially from Alza Corporation and Nova Pharmaceuticals, Inc Liposomal suspensions (including liposomes targeted to infected cells with monoclonal antibodies to viral antigens) can also be used as pharmaceutically acceptable earners These can be prepared according to methods known to those skilled m the art, for example, as descobed m U S Pat No 4.522,811 It is especially advantageous to formulate oral or parenteral compositions in dosage unit form for ease of administration and uniformity of dosage Dosage unit form as used herein refers to physically discrete units suited as unitary dosages for the subject to be treated, each unit containing a predetermined quantity of active compound calculated to produce the desired therapeutic effect in association with the required pharmaceutical earner The specification for the dosage unit forms of the invention are dictated by and directly dependent on the unique charactenstics of the active compound and the particular therapeutic effect to be achieved The nucleic acid molecules of the invention can be inserted into vectors and used as gene therapy vectors Gene therapy vectors can be delivered to a subject by any of a number of routes, e g , as descobed in U S Patent Nos 5,703,055 Delivery can thus also include, e g , intravenous injection, local administration (see U S Pat No 5,328,470) or stereotactic injection (see e g , Chen et al ( 1994) PNAS 91 3054-3057) The pharmaceutical preparation of the gene therapy vector can include the gene therapy vector m an acceptable diluent, or can compose a slow release matox in which the gene delivery vehicle is imbedded Alternatively, where the complete gene dehv ery vector can be produced mtact from recombinant cells, e g , retroviral vectors, the pharmaceutical preparation can include one or more cells that produce the gene delivery system The pharmaceutical compositions can be included in a container, pack, or dispenser together with instructions for administration Uses and Methods of the Invention The nucleic acid molecules, proteins, protein homologues, and antibodies descnbed herein can be used in one or more of the following methods (a) screening assays, (b) detection assays (e g , chromosomal mapping, tissue typing, forensic biology), (c) predictive medicine (e g , diagnostic assays, prognostic assays, momtonng clinical tnals. and phannacogenomics), and (d) methods ot treatment (e g , therapeutic and prophylactic) As described herein, in one embodiment, a FGF-CX protein of the invention has the ability to bind ATP In another embodiment. FGF-CX protein has the ability to bind a FGFR The isolated nucleic acid molecules of the invention can be used to express FGF-CX protein (e g , via a recombinant expression vector in a host cell m gene therapy applications), to detect FGF-CX mRNA (e g , in a biological sample) or a genetic lesion in a FGF-CX gene, and to modulate FGF-CX activity, as descobed further below In addition, the FGF-CX proteins can be used to screen drugs or compounds that modulate the FGF-CX activity or expression as well as to treat disorders characteozed by insufficient or excessive production of FGF-CX protein, for example proliferative or differentiative disorders, or production of FGF - CX protein forms that have decreased or aberrant activity compared to FGF-CX wild type protein In addition, the anti-FGF-CX antibodies of the invention can be used to detect and isolate FGF-CX proteins and modulate FGF-CX activity This invention further pertains to novel agents identified by the above descnbed screening assays and uses thereof for treatments as descobed herein Screening Assays The invention provides a method (also referred to herein as a "screening assay") for identifying modulators, i e , candidate or test compounds or agents (e g , peptides, peptidomimetics, small molecules or other drugs) that bind to FGF-CX proteins or have a stimulatory or inhibitory effect on, for example, FGF-CX expression or FGF-CX activity In one embodiment, the invention provides assays for screening candidate or test compounds which bind to or modulate the activity ot a FGF-CX protein or polypeptide or biologically active portion thereof The test compounds of the present invention can be obtained using any of the numerous approaches in combmatooal library methods known in the art, including biological libraries, spatially addressable parallel solid phase or solution phase hbraoes, synthetic library methods requiong deconv olution, the "one-bead one-compound" brarv method, and synthetic library methods using affinity chromatography selection The biological library approach is limited to peptide hbraoes, while the other four approaches are applicable to peptide, non-peptide ohgomer or small molecule hbranes of compounds (Lam ( 1997) Anticancer Drug Des 12 145) Examples of methods for the synthesis of molecular hbranes can be found in the art, for example m DeWitt et al ( 1993) Proc Natl Acad Sci U S A 90 6909, Erb et al (1994) Pioc Natl Acad Sci U S 91 1 1422, Zuckermann et al (1994) J Med Chem 37 2678, Cho ef al (1993) Science 261 1303, Canell ef al (1994) Angew Chem Int Ed Engl 33 2059, Carell et al ( 1994) Angew Chem Int Ed Engl 33 2061 , and Gallop et al (1994) J Med Chem 37 1233 Libranes of compounds may be presented m solution (e g , Houghten (1992) Biotechmques 13 412-421), or on beads (Lam (1991) Natwe 354 82-84), on chips (Fodor (1993) Nature 364 555-556). bactena (Ladner U S Pat No 5,223,409), spores (Ladner USP '409), plasmids (Cull et al ( 1992) Proc Natl Acad Sci [/S 89 1865- 1869) or on phage (Scott and Smith (1990) Science 249 386-390, Devlin (1990) Science 249 404-406, Cwirla ef al (1990) Proc Natl cad Sci U S A 87 6378-6382, Fehci (1991) J Mol Biol 222 301-310, Ladner above ) In one embodiment, an assay is a cell-based assay in which a cell which expresses a membrane-bound form of FGF-CX protein, or a biologically active portion thereof, on the cell surface is contacted w ith a test compound and the ability of the test compound to bind to a FGF-CX protein determined The cell, for example, can of mammalian oogin or a yeast cell Determining the ability of the test compound to bind to the FGF-CX protein can be accomplished, for example, by coupling the test compound with a radioisotope or enzymatic label such that binding of the test compound to the FGF-CX protein or biologically active portion thereof can be determined by detecting the labeled compound m a complex For example, test compounds can be labeled with ~ T, ^ S C, or Η, either directly or indirectly, and the radioisotope detected by direct counting of radioemission or by scintillation counting Alternatively, test compounds can be enzymatically labeled with, for example, horseradish peroxidase, alkaline phosphatase, or luciferase, and the enzymatic label detected by determrnation of conversion of an appropnate substrate to product In one embodiment, the assay compnses contacting a cell which expresses a membrane-bound form of FGF-CX protein, or a biologically active portion thereof, on the cell surface with a known compound which binds FGF-CX to form an assay mixture, contacting the assay mixture with a test compound, and determining the ability of the test compound to interact with a FGF-CX protein, wherem determining the ability of the test compound to interact with a FGF-CX protein compnses determining the ability of the test compound to preferentially bind to FGF- CX or a biologically active portion thereof as compared to the known compound In another embodiment, an assay is a cell-based assay composing contacting a cell expressing a membrane-bound form of FGF-CX protein, or a biologically active portion thereof, on the cell surface with a test compound and determining the ability of the test compound to modulate (e g , stimulate or inhibit) the activity of the FGF-CX protein or biologically active portion thereof Determining the ability of the test compound to modulate the activity of FGF-CX or a biologically active portion thereof can be accomplished, for example, by determining the ability of the FGF-CX protein to bind to or interact with a FGF- CX target molecule As used herein, a "target molecule" is a molecule with which a FGF-CX protein binds or interacts in nature, for example, a molecule on the surface of a cell which expresses a FGF-CX interacting protein, a molecule on the surface of a second cell, a molecule in the extracellular milieu, a molecule associated with the internal surface of a cell membrane or a cytoplasmic molecule A FGF-CX target molecule can be a non-FGF-CX molecule or a FGF-CX protein or polypeptide of the present invention In one embodiment, a FGF-CX target molecule is a component of a signal transduction pathway that facilitates transduction of an extracellular signal (e g , a signal generated by binding of a compound to a membrane-bound FGF-CX molecule) through the cell membrane and into the cell The target, for example, can be a second intercellular protein that has catalytic activity or a protein that facilitates the association of downstream signaling molecules with FGF-CX Determining the ability of the FGF-CX protein to bind to or interact with a FGF-CX target molecule can be accomplished by one of the methods descnbed above for determining direct binding In one embodiment, determining the ability of the FGF-CX protein to bind to or interact with a FGF-CX target molecule can be accomplished by determining the activity of the target molecule For example, the activity of the target molecule can be determined by detecting induction of a cellular second messenger of the target (i e mtracellular C ~ ÷ , diacylglycerol, IP 3 , etc ), detecting catalytic/enzymatic activity of the target an appropoate substrate, detecting the induction of a reporter gene (composing a FGF-CX-responsive regulatory element operatively linked to a nucleic acid encoding a detectable marker, e g , luciferase), or detecting a cellular response, for example, cell survival, cellular differentiation, or cell proliferation In yet another embodiment, an assay of the present invention is a cell-free assay composing contacting a FGF-CX protein or biologically active portion thereof with a test compound and determining the ability of the test compound to bind to the FGF-CX protein or biologically active portion thereof Binding of the test compound to the FGF-CX protein can be determined either directly or indirectly as descnbed above In one embodiment, the assay composes contacting the FGF-CX protein or biologically active portion thereof with a known compound which binds FGF-CX to form an assay mixture, contacting the assay mixture with a test compound, and determining the ability of the test compound to interact with a FGF-CX protein, wherem determining the ability of the test compound to interact with a FGF-CX protein comprises determining the ability of the test compound to preferentially bind to FGF- CX or biologically active portion thereof as compared to the known compound In another embodiment, an assay is a cell-free assay composing contacting FGF-CX protein or biologically active portion thereof with a test compound and determining the ability of the test compound to modulate (e g , stimulate or inhibit) the activity of the FGF-CX protein or biologically active portion thereof Determining the ability of the test compound to modulate the activity of FGF-CX can be accomplished, for example, by determining the ability of the FGF-CX protein to bind to a FGF-CX target molecule by one of the methods descnbed above for determining direct binding In an alternative embodiment, determining the ability of the test compound to modulate the activity of FGF-CX can be accomplished by determining the ability of the FGF-CX protein further modulate a FGF-CX target molecule For example, the catalytic/enzvmatic activity of the target molecule on an appropnate substrate can be determined as previously descnbed In yet another embodiment, the cell-free assay compnses contacting the FGF-CX protein or biologically active portion thereof with a known compound which binds FGF-CX to form an assay mixture, contacting the assay mixture with a test compound, and determining the ability of the test compound to interact with a FGF-CX protein, wherem determining the ability of the test compound to interact with a FGF-CX protein compnses detennmmg the ability of the FGF-CX protein to preferentially bind to or modulate the activity of a FGF-CX target molecule The cell-free assays of the present invention are amenable to use of both the soluble form or the membrane-bound form of FGF-CX In the case of cell-free assays compnsmg the membrane-bound form of FGF-CX, it may be desirable to utilize a solubilizmg agent such that the membrane-bound form of FGF-CX is maintained in solution Examples of such solubilizmg agents include non-ionic detergents such as n-octylglucoside, n-dodecylglucoside, n-dodecvlmaltoside, octanoyl-N-methylglucamide, decanoyl-N-methylglucamide. Tnton" X-100, Tnton" X-l 14, Thesit*-, Isotndecypoly(efhylene glycol ether) n , N-dodecyl— N.N-dιmethyl-3-ammomo-l -propane sulfonate, 3-(3-cholamιdopropyl)dιmethylammιnιol- 1 -propane sulfonate (CHAPS), or 3-(3-cholamιdopropyl)dιmethylammmιol-2-hydroxy- 1 -propane sulfonate (CHAPSO) In more than one embodiment of the above assay methods of the present invention, it may be desirable to immobilize either FGF-CX or its target molecule to facilitate separation of complexed from uncomplexed forms of one or both of the proteins, as well as to accommodate automation of the assay Binding of a test compound to FGF-CX, or interaction of FGF-CX with a target molecule in the presence and absence of a candidate compound, can be accomplished m any vessel suitable for containing the reactants Examples of such vessels include microtiter plates, test tubes, and micro-centπfuge tubes In one embodiment, a fusion protein can be provided that adds a domain that allows one or both of the proteins to be bound to a matox For example, GST-FGF-CX fusion proteins or GST-target fusion proteins can be adsorbed onto glutathione sepharose beads (Sigma Chemical, St Louis, MO) or glutathione denvatized microtiter plates, that are then combined with the test compound or the test compound and either the non-adsorbed target protein or FGF-CX protein, and the mixture is incubated under conditions conducive to complex formation (e g , at physiological conditions for salt and pH) Following incubation, the beads or microtiter plate wells are w ashed to remove any unbound components, the matnx immobilized in the case of beads, complex determined either directly or indirectly, for example, as descnbed above Alternatively, the complexes can be dissociated from the matox, and the level of FGF-CX binding or activity determined using standard techniques Other techniques for immobilizing proteins on matnces can also be used in the screening assays of the invention For example, either FGF-CX or its target molecule can be immobilized utilizing conjugation of biotm and streptavidin Biotinylated FGF-CX or target molecules can be prepared from biotm-NHS (N-hydroxy-succmimide) using techniques well known in the art (e g , biotinylation kit, Pierce Chemicals, Rockford, 111 ), and immobilized in the wells of streptavidm-coated 96 well plates (Pierce Chemical) Alternatively, antibodies reactive with FGF-CX or target molecules, but which do not interfere with binding of the FGF-CX protein to its target molecule, can be deovatized to the wells of the plate, and unbound target or FGF-CX trapped in the wells by antibody conjugation Methods for detecting such complexes, in addition to those descobed above for the GST-immobilized complexes, include immunodetection of complexes using antibodies reactive with the FGF- CX or target molecule, as well as enzvme-hnked assays that rely on detecting an enzymatic activity associated with the FGF-CX or target molecule In another embodiment, modulators of FGF-CX expression are identified in a method wherem a cell is contacted with a candidate compound and the expression of FGF-CX mRNA or protein in the cell is determined The level of expression of FGF-CX mRNA or protein in the presence of the candidate compound is compared to the level of expression of FGF-CX mRNA or protein in the absence of the candidate compound The candidate compound can then be identified as a modulator of FGF-CX expression based on this companson For example, when expression of FGF-CX mRNA or protein is greater (statistically significantly greater) in the presence of the candidate compound than in its absence, the candidate compound is identified as a stimulator of FGF-CX mRNA or protein expression Alternatively, when expression of FGF-CX mRNA or protein is less (statistically significantly less) in the presence of the candidate compound than in its absence, the candidate compound is identified as an inhibitor of FGF-CX mRNA or protein expression The level of FGF-CX mRNA or protein expression in the cells can be determined by methods descnbed herein for detecting FGF-CX mRNA or protein In yet another aspect of the invention, the FGF-CX proteins can be used as "bait proteins" m a two-hybod assay or three hybod assay (see, e g , U S Pat No 5,283,317. Zervos ef al (1993) Cell 72 223-232, Madura et al (1993) J Biol Chem 268 12046-12054, Bartel et al ( 1993) Biotechmques 14 920-924, Iwabuchi et al (1993) Oncogene 8 1693-1696, and Brent W094/ 10300), to identify other proteins that bind to or interact with FGF-CX ("FGF-CX-bmdmg proteins" or "FGF-CX-bp") and modulate FGF-CX activity Such FGF- CX-bind g proteins are also likely to be involved in the propagation of signals by the FGF- CX proteins as, for example, upstream or downstream elements of the FGF-CX pathway The two-hybod system is based on the modular nature of most transcoption factors, which consist of separable DNA-bindmg and activation domains Boefly, the assay utilizes two different DNA constructs In one construct, the gene that codes for FGF-CX is fused to a gene encoding the DNA binding domain of a known transcoption factor (e g , GAL-4) In the other construct, a DNA sequence, from a library of DNA sequences, that encodes an unidentified protein ("prey" or "sample") is fused to a gene that codes for the activation domain of the known transcoption factor If the "bait" and the "prey" proteins are able to interact, in vivo, forming a FGF-CX-dependent complex, the DNA-bindmg and activation domains of the transcnption factor are brought into close proximity This proximity allows transcnption of a reporter gene (e g , LacZ) that is operably linked to a transcnptional regulatory site responsiv e to the transcoption factor Expression of the reporter gene can be detected and cell colonies containing the functional transcoption factor can be isolated and used to obtain the cloned gene that encodes the protein which interacts with FGF-CX This invention further pertains to novel agents identified by the above-descobed screening assavs and uses thereof for treatments as descobed herein Detection Assav Portions or fragments of the cDNA sequences identified herein (and the corresponding complete gene sequences) can be used in numerous ways as polynucleotide reagents For example, these sequences can be used to (I) map their respective genes on a chromosome, and, thus, locate gene regions associated with genetic disease, (n) identify an individual from a minute biological sample (tissue typing), and (in) aid in forensic identification of a biological sample The FGF-CX sequences of the present invention can also be used to identify individuals from minute biological samples In this technique, an individual's genomic DNA is digested with one or more restoction enzymes, and probed on a Southern blot to yield unique bands for identification The sequences of the present invention are useful as additional DNA markers for RFLP ("restnction fragment length polymorphisms," descnbed in U S Pat No 5,272,057) Furthermore, the sequences of the present invention can be used to provide an alternative technique that determines the actual base-by-base DNA sequence of selected portions of an individual's genome Thus, the FGF-CX sequences descnbed herein can be used to prepare two PCR pomers from the 5' and 3' ends of the sequences These pomers can then be used to amplify an individual's DNA and subsequently sequence it Panels of corresponding DNA sequences from individuals, prepared in this manner, can provide unique individual identifications, as each individual will have a unique set of such DNA sequences due to allehc differences The sequences of the present invention can be used to obtain such identification sequences from individuals and from tissue The FGF-CX sequences of the invention uniquely represent portions of the human genome Allehc vaoation occurs to some degree m the coding regions of these sequences, and to a greater degree in the noncoding regions It is estimated that allehc vaoation between individual humans occurs with a frequency of about once per each 500 bases Much of the allehc vaoation is due to single nucleotide polymorphisms (SNPs). which include restoction fragment length polymorphisms (RFLPs) Each of the sequences descobed herein can, to some degree, be used as a standard against which DNA from an individual can be compared for identification purposes Because greater numbers of polymorphisms occur in the noncoding regions, fewer sequences are necessary to differentiate individuals The noncoding sequences of SEQ ID NO 1, as descobed above, can comfortablv provide positive individual identification with a panel of perhaps 10 to 1,000 primers that each yield a noncoding amplified sequence of 100 bases If predicted coding sequences are used, a more appropoate number of pomers for positive individual identification would be 500-2,000 Predictive Medicine The present invention also pertains to the field of predictive medicine in which diagnostic assays, prognostic assays, pharmacogenomics, and momtoong clinical toals are used for prognostic (predictive) purposes to thereby treat an individual prophylactically Accordingly, one aspect of the present invention relates to diagnostic assays for determining FGF-CX protein and/or nucleic acid expression as well as FGF-CX activity, in the context of a biological sample (e g , blood, serum, cells, tissue) to thereby determine whether an individual is afflicted with a disease or disorder, or is at nsk of developing a disorder, associated with aberrant FGF-CX expression or activity The invention also provides for prognostic (or predictive) assays for determining whether an individual is at nsk of developing a disorder associated with FGF-CX protein, nucleic acid expression or activity For example, mutations m a FGF-CX gene can be assayed m a biological sample Such assays can be used for prognostic or predictive purpose to thereby prophylactically treat an individual pnor to the onset of a disorder charactenzed by or associated with FGF-CX protein, nucleic acid expression or activity Another aspect of the invention provides methods for determining FGF-CX protein, nucleic acid expression or FGF-CX activity m an individual to thereby select appropnate therapeutic or prophylactic agents for that individual (referred to herein as "pharmacogenomics") Pharmacogenomics allows for the selection of agents (e g , drugs) for therapeutic or prophylactic treatment of an individual based on the genotype of the individual (e g , the genotype of the individual examined to determine the ability of the individual to respond to a particular agent ) Yet another aspect of the invention pertains to momtonng the influence of agents (e g , drugs, compounds) on the expression or activity of FGF-CX in clinical tnals These and other agents are descnbed in further detail in the following sections Diagnostic Assays Fibroblast growth factors FGF-1 through FGF-9 generally promote cell proliferation in cells carrying the particular growth factor receptor Examples of FGF growth promotion include epithelial cells, such as fibroblasts and keratmocytes, in the antenor eye after surgery Other conditions in which proliferation of cells plays a role include tumors, restenosis, psonasis, Dupuytren's contracture, diabetic complications. Kaposi's sarcoma and rheumatoid arthntis FGF-CX may be used in the method of the invention for detecting its corresponding fibroblast growth factor receptor CX (FGFRCX) in a sample or tissue The method comprises contacting the sample or tissue with FGF-CX, allowing formation of receptor-ligand pairs, and detecting any FGFRCX FGF-CX pairs Compositions containing FGF-CX can be used to increase FGFRCX activity, for example to stimulate cartilage or bone repair Compositions containing FGF-CX antagonists or FGF-CX binding agents (e g anti- FGF-CX antibodies) can be used to treat diseases caused by an excess of FGF-CX or overactivity of FGFRCX, especially multiple or solitary hereditary exostosis, hallux valgus deformity, achondroplasra, synovial chondromatosis and endochondromas Gha activating factor (GAF) and the DNA encoding GAF act to specifically promote growth of ghal cells Some examples of gha-associated disorders in which GAF may be utilized to modulate ghal cell activities are cerebral lesions, cerebral edema, senile dementia, Alzheimer's disease, diabetic neuropathies, etc Similarly, FGF-CX may be used in diagnosis or treating ghal cell related disorders The ghal-cell modulating activity of FGF-CX may be as a neuroprotective-hke activity, and FGF-CX may be used as a neuroprotective agent Due to the close homology of FGF-CX to FGF-9. which was identified onginally as a gha activating factor, it can be presumed that the FGF-CX sequence is also a gha activating factor FGF-CX can therefor be used to stimulate the growth of gha cells and can be used to accelerate healing of cerebral lesions or to treat cerebral edema, senile dementia, Alzheimer's disease, or diabetic neuropathy FGF-CX can also be used to stimulates fibroblasts (for accelerating healing of burns, wounds, ulcers, etc), megakaryocytes (to increase the number of platelets), hematopoietic cells, immune system cells, and vascular smooth muscle cells FGF-CX is also expected to have osteogenesis-promotmg activity, and can be used for treating bone fractures and osteoporosis Assay of FGF-CX polypeptide or nucleic acid moieties may be useful m diagnosis of cerebral tumors, and antibodies against could be used to treat such tumors It can also be used as a reagent for stimulating growth of cultured cells An anticipated dosage is lng-0 lmg/ kg/day, though treatment may vary depending on the type or seventy of the disorder being treated FGF-CX polypeptides may be used as platelet increasing agents, osteogenesis promoting agents or for treating cerebral nervous diseases or hepatopathy such as hepatic cirrhosis They can also be used to treat cancer when used alongside an anticancer agent Antibodies directed against the FGF-CX polypeptide, or fragments, denvatives, or analogs thereof, can be used for detecting or determining a biological activity of a FGF-CX polypeptide or for punfying a FGF-CX polypeptide Those antibodies that also neutralize the cell growth activity of FGF-CX can be used as anticancer agents Many, if not all, homologous proteins are known m the art to have closely related or identical functions See, e g , Lewin, "Chapter 21 Structural Genes Belong to Families" In GENES II, 1985, John Wiley and Sons, Inc , New York The FGF-CX polypeptide closely resembles the Xenopus XFGF-CX protein, which was shown previously to be specifically expressed in highly proliferative tissues (see. e g , Koga ef al , above) Therefore, it is presumed that FGF-CX would also modulate cellular activity in highly proliferative tissues FGF-CX may thus be particularly useful m diagnosing proliferative disorders and in stimulating the growth of cells and tissues in order to overcome pathological states in which such growth has been suppressed or inhibited Oligonucleotides conespondmg to any one portion of the FGF-CX nucleic acids of SEQ ID NO 1 may be used to detect the expression of a FGF-CX-hke gene The proteins of the mv ention may be used to stimulate production of antibodies specifically binding the proteins Such antibodies may be used in lmmunodiagnostic procedures to detect the occurrence of the protein in a sample The proteins of the invention may be used to stimulate cell growth and cell proliferation in conditions in which such growth would be fav orable An example would be to counteract toxic side effects of chemotherapeutic agents on, for example, hematopoiesis and platelet formation, linings of the gastrointestinal tract, and hair follicles They may also be used to stimulate new cell growth m neurological disorders including, for example, Alzheimer's disease Alternatively, antagonistic treatments may be administered in which an antibody specifically binding the FGF-CX -like proteins of the invention would abrogate the specific growth-inducing effects of the proteins Such antibodies may be useful, for example, in the treatment of proliferative disorders including vanous tumors and benign hyperplasias An exemplary method for detecting the presence or absence of FGF-CX in a biological sample involves obtaining a biological sample from a test subject and contacting the biological sample with a compound or an agent capable of detecting FGF-CX protein or nucleic acid (e g , mRNA, genomic DNA) that encodes FGF-CX protein such that the presence of FGF-CX is detected in the biological sample An agent for detecting FGF-CX mRNA or genomic DNA is a labeled nucleic acid probe capable of hybodizmg to FGF-CX mRNA or genomic DNA The nucleic acid probe can be, for example, a full-length FGF-CX nucleic acid, such as the nucleic acid of SEQ ID NO 1, or a portion thereof, such as an ohgonucleotide of at least 15, 30, 50, 100, 250 or 500 nucleotides m length and sufficient to specifically hybodize under stringent conditions to FGF-CX mRNA or genomic DNA, as descobed above Other suitable probes for use in the diagnostic assays of the invention are descobed herein An agent for detecting FGF-CX protein is an antibody capable of binding to FGF-CX protein, preferably an antibody with a detectable label Antibodies can be polyclonal, or more preferably, monoclonal An intact antibody, or a fragment thereof (e g , Fab or F(ab') 2 ) can be used The term "labeled", with regard to the probe or antibody, is intended to encompass direct labeling of the probe or antibody by coupling (i e , physically linking) a detectable substance to the probe or antibody, as well as indirect labeling of the probe or antibody by reactivity with another reagent that is directly labeled Examples of indirect labeling include detection of a pnmary antibody using a fluorescently labeled secondary antibody and end-labeling of a DNA probe with biotin such that it can be detected with fluorescently labeled streptavidin The term "biological sample" is intended to include tissues, cells and biological fluids isolated from a subject, as well as tissues, cells and fluids present withm a subject That is, the detection method of the invention can be used to detect FGF-CX mRNA, protein, or genomic DNA in a biological sample in vitro as well as in vivo For example, in vitro techniques for detection of FGF-CX mRNA include Northern hybndizations and in situ hybndizations In vitro techniques for detection of FGF-CX protein include enzyme linked immunosorbent assays (ELISAs), Western blots, lmmunoprecipitations and lmmunofluorescence In vitro techniques for detection of FGF-CX genomic DNA include Southern hybndizations Furthermore, in vivo techniques for detection of FGF-CX protein include introducing into a subject a labeled anti-FGF-CX antibody For example, the antibody can be labeled with a radioactive marker whose presence and location m a subject can be detected by standard imaging techniques In one embodiment, the biological sample contains protein molecules from the test subject Alternatively, the biological sample can contain mRNA molecules from the test subject or genomic DNA molecules from the test subject A preferred biological sample is a peopheral blood leukocyte sample isolated by conventional means from a subject In another embodiment, the methods further involve obtaining a control biological sample from a control subject, contacting the control sample with a compound or agent capable of detecting FGF-CX protein, mRNA, or genomic DNA, such that the presence of FGF-CX protein, mRNA or genomic DNA is detected in the biological sample, and comparing the presence of FGF-CX protein, mRNA or genomic DNA in the control sample with the presence of FGF-CX protein, mRNA or genomic DNA m the test sample The inv ention also encompasses kits for detecting the presence of FGF-CX m a biological sample For example, the kit can compose a labeled compound or agent capable of detecting FGF-CX protein or mRNA in a biological sample, means for determining the amount of FGF-CX in the sample, and means for companng the amount of FGF-CX in the sample with a standard The compound or agent can be packaged in a suitable container. The kit can further compnse instructions for using the kit to detect FGF-CX protein or nucleic acid Prognostic Assays The diagnostic methods descnbed herein can furthermore be utilized to identify subjects having or at nsk of developing a disease or disorder associated with aberrant FGF-CX expression or activity For example, the assays descnbed herein, such as the preceding diagnostic assays or the following assays, can be utilized to identify a subject having or at risk of developing a disorder associated with FGF-CX protein, nucleic acid expression or activity in. e g , proliferative or differentiative disorders such as hyperplasias, tumors, restenosis, psooasis, Dupuytren's contracture, diabetic complications, or rheumatoid arthntis, etc , and gha-associated disorders such as cerebral lesions, diabetic neuropathies, cerebral edema, senile dementia, Alzheimer's disease, etc Alternatively, the prognostic assays can be utilized to identify a subject having or at nsk for developing a disease or disorder Thus, the present invention provides a method for identifying a disease or disorder associated with aberrant FGF-CX expression or activity in which a test sample is obtained from a subject and FGF-CX protein or nucleic acid (e g , mRNA, genomic DNA) is detected, wherem the presence of FGF- CX protein or nucleic acid is diagnostic for a subject having or at nsk of developing a disease or disorder associated with aberrant FGF-CX expression or activity As used herein, a "test sample" refers to a biological sample obtained from a subject of interest For example, a test sample can be a biological fluid (e g , serum), cell sample, or tissue Furthermore, the prognostic assavs descobed herein can be used to determine whether a subject can be administered an agent (e g , an agonist, antagonist, peptidomimetic, protein, peptide, nucleic acid, small molecule, or other drug candidate) to treat a disease or disorder associated with abeoant FGF-CX expression or activity For example, such methods can be used to determine whether a subject can be effectively treated with an agent for a disorder, such as a proliferative disorder, differentiativ e disorder, gha-associated disorders, etc Thus, the present invention provides methods for determining whether a subject can be effectively treated with an agent for a disorder associated with aberrant FGF-CX expression or activity m which a test sample is obtained and FGF-CX protein or nucleic acid is detected (e g , wherem the presence of FGF-CX protein or nucleic acid is diagnostic for a subject that can be administered the agent to treat a disorder associated with aberrant FGF-CX expression or activity ) The methods of the invention can also be used to detect genetic lesions in a FGF-CX gene, thereby determining if a subject with the lesioned gene is at nsk for, or suffers from, a proliferative disorder, differentiative disorder, gha-associated disorder, etc In various embodiments, the methods include detecting, in a sample of cells from the subject, the presence or absence of a genetic lesion characteozed by at least one of an alteration affecting the integrity of a gene encoding a FGF-CX-protem, or the mis-expression of the FGF-CX gene For example, such genetic lesions can be detected by ascertaining the existence of at least one of (1) a deletion of one or more nucleotides from a FGF-CX gene, (2) an addition of one or more nucleotides to a FGF-CX gene, (3) a substitution of one or more nucleotides of a FGF-CX gene, (4) a chromosomal reanangement of a FGF-CX gene, (5) an alteration in the level of a messenger RNA transcopt of a FGF-CX gene, (6) abeoant modification of a FGF- CX gene, such as of the methylation pattern of the genomic DNA, (7) the presence of a non-wild type splicing pattern of a messenger RNA transcopt of a FGF-CX gene, (8) a non-wild type level of a FGF-CX-protem, (9) allehc loss of a FGF-CX gene, and (10) mappropoate post-translational modification of a FGF-CX-protein As descobed herein, there are a large number of assay techniques known in the art which can be used for detecting lesions in a FGF-CX gene A prefened biological sample is a peopheral blood leukocyte sample isolated by com entional means from a subject However, any biological sample containing nucleated cells may be used, including, for example, buccal mucosal cells In certain embodiments, detection of the lesion involves the use of a probe/pomer in a polymerase chain reaction (PCR) (see, e g . U S Pat Nos 4,683,195 and 4,683,202), such as anchor PCR or RACE PCR, or, alternatively, in a ligation chain reaction (LCR) (see, e g , Landegran et al (1988) Science 241 1077-1080, and Nakazawa et al (1994) PNAS 91 360-364) the latter of which can be particularly useful for detecting point mutations in the FGF-CX-gene (see Abravaya et al (1995) Nucl Acids Res 23 675-682) This method can include the steps of collecting a sample of cells from a patient, isolating nucleic acid (e g , genomic, mRNA or both) from the cells of the sample, contacting the nucleic acid sample with one or more pomers that specifically hybodize to a FGF-CX gene under conditions such that hybodization and amplification of the FGF-CX gene (if present) occurs, and detecting the presence or absence of an amplification product, or detecting the size of the amplification product and compaong the length to a control sample It is anticipated that PCR and/or LCR may be desirable to use as a preliminary amplification step in conjunction with any of the techniques used for detecting mutations descnbed herein Alternative amplification methods include self sustained sequence replication (Guatel ef al , 1990, Proc Natl Acad Sci USA 87 1874-1878), transcnptional amplification system (Kwoh, et al , 1989, Proc Natl Acad Sci USA 86 1173-1177), Q-Beta Rephcase (Lizardi et al 1988, BιoTechnolog \ > 6 1197), or any other nucleic acid amplification method, followed bv the detection of the amplified molecules using techniques well known to those of skill in the art These detection schemes are especially useful for the detection of nucleic acid molecules if such molecules are present in verv low numbers In an alternative embodiment, mutations in a FGF-CX gene from a sample cell can be identified bv alterations m restnction enzyme cleavage patterns For example, sample and control DNA is isolated, amplified (optionally), digested with one or more restnction endonucleases, and fragment length sizes are determined by gel electrophoresis and compared Differences m fragment length sizes between sample and control DNA indicates mutations in the sample DNA Moreover, the use of sequence specific ribozymes (see, for example. U S Pat No 5,493,531) can be used to score for the presence of specific mutations by development or loss of a nbozyme cleavage site In other embodiments, genetic mutations in FGF-CX can be identified by hybndizmg a sample and control nucleic acids, e g , DNA or RNA, to high density arrays containing hundreds or thousands of oligonucleotides probes (Cronin et al (1996) Human Mutation 7 244-255, Kozal et al (1996) Nature Medicine 2 753-759) For example, genetic mutations in FGF-CX can be identified in two dimensional arrays containing light-generated DNA probes as descnbed m Cronin et al above Boefly, a first hybndization anay of probes can be used to scan through long stretches of DNA in a sample and control to identify base changes between the sequences by making linear arrays of sequential overlapping probes This step allows the identification of point mutations This step is followed by a second hybndization array that allows the characteozation of specific mutations by using smaller, specialized probe arrays complementary to all vanants or mutations detected Each mutation array is composed of parallel probe sets, one complementary to the wild-type gene and the other complementary to the mutant gene In yet another embodiment, any of a vanety of sequencing reactions known m the art can be used to directly sequence the FGF-CX gene and detect mutations by compaong the sequence of the sample FGF-CX with the corresponding wild-type (control) sequence Examples of sequencing reactions include those based on techniques developed by Maxim and Gilbert ( 1977) PNAS 74 560 or Sanger (1977) PNAS 74 5463 It is also contemplated that any of a vaoety of automated sequencing procedures can be utilized when performing the diagnostic assays (Naeve et al , (1995) Bwtechniques 19 448), including sequencing by mass spectrometry (see, e g , PCT International Publ No WO 94/16101 , Cohen ef al (1996) Adv Chromatogr 36 127-162, and Goffin et al (1993) Appl Biochem Biotechnol 38 147-159) Other methods for detecting mutations in the FGF-CX gene include methods in which protection from cleavage agents is used to detect mismatched bases in RNA/RNA or RNA/DNA heteroduplexes (Myers ef al (1985) Science 230 1242) In general, the art technique of "mismatch cleavage" starts by providing heteroduplexes of formed by hybodizing (labeled) RNA or DNA containing the wild-type FGF-CX sequence with potentially mutant RNA or DNA obtained from a tissue sample The double-stranded duplexes are treated with an agent that cleaves smgle-stranded regions of the duplex such as which will exist due to basepair mismatches between the control and sample strands For instance, RNA/DNA duplexes can be treated with RNase and DNA/DNA hybods treated with SI nuclease to enzymatically digesting the mismatched regions In other embodiments, either DNA JNA or RNA/DNA duplexes can be treated with hydroxvlamine or osmium tetroxide and with pipendme in order to digest mismatched regions After digestion of the mismatched regions, the resulting matenal is then separated by size on denatunng polyacrylamide gels to determine the site of mutation See, for example, Cotton et al (1988) Proc Natl Acad Sci USA 85 4397, Saleeba ef al (1992) Methods Enzymol 217 286-295 In an embodiment, the control DNA or RNA can be labeled for detection In still another embodiment, the mismatch cleavage reaction employs one or more proteins that recognize mismatched base pairs m double-stranded DNA (so called "DNA mismatch repair" enzymes) m defined systems for detecting and mapping point mutations in FGF-CX cDNAs obtained from samples of cells For example, the mutY enzyme of £ coli cleaves A at G/A mismatches and the thymidine DNA glycosylase from HeLa cells cleaves T at G/T mismatches (Hsu et al (1994) Caicinogenesis 15 1657-1662) According to an exemplary embodiment, a probe based on a FGF-CX sequence, e g , a wild-type FGF-CX sequence, is hybodized to a cDNA or other DNA product from a test cell(s) The duplex is treated with a DNA mismatch repair enzyme, and the cleavage products, if any, can be detected from electrophoresis protocols or the like See. for example, U S Pat No 5,459,039 In other embodiments, alterations in electrophoretic mobility will be used to identify mutations m FGF-CX genes For example, single strand conformation polymorphrsm (SSCP) may be used to detect differences in electrophoretic mobility between mutant and wild type nucleic acids (Oota et al (1989) Proc Natl Acad Sci USA 86 2766, see also Cotton (1993) Mutat Res 285 125-144, Havashi (1992) Genet Anal Tech Appl 9 73-79) Smgle-stranded DNA fragments of sample and control FGF-CX nucleic acids will be denatured and allowed to renature The secondary structure of smgle-stranded nucleic acids vaoes according to sequence, the resulting alteration in electrophoretic mobility enables the detection of even a single base change The DNA fragments may be labeled or detected with labeled probes The sensitivity of the assay may be enhanced by using RNA, rather than DNA, in which the secondary structure is more sensitive to a change in sequence In one embodiment, the subject method utilizes heteroduplex analysis to separate double stranded heteroduplex molecules on the basis of changes in electrophoretic mobility See, e g , Keen et al (1991) Trends Genet 7 5 In yet another embodiment the movement of mutant or wild-type fragments in polyacrylamide gels containing a gradient of denaturant is assayed using denatuong gradient gel elecfrophoresis (DGGE) See, e g , Myers et al (1985) Nature 313 495 When DGGE is used as the method of analysis, DNA will be modified to insure that it does not completely denature, for example by adding a GC clamp of approximately 40 bp of high-melting GC-och DNA by PCR In a further embodiment, a temperature gradient is used in place of a denatuong gradient to identify differences in the mobility of control and sample DNA See, e g , Rosenbaum and Reissner (1987) Biophvs Chem 265 12753 Examples of other techniques for detecting point mutations include, but are not limited to, selective ohgonucleotide hybndization, selective amplification, or selective pnmer extension For example, ohgonucleotide pnmers may be prepared m which the known mutation is placed centrally and then hybndized to target DNA under conditions that permit hybndization only if a perfect match is found See, e g , Saiki ef al (1986) Nature 324 163), Saiki et al (1989) Proc Natl Acad Sci USA 86 6230 Such allele specific oligonucleotides are hybodized to PCR amplified target DNA or a number of different mutations when the oligonucleotides are attached to the hybodizing membrane and hybodized with labeled target DNA Alternatively, allele specific amplification technology that depends on selectiv e PCR amplification may be used m conjunction with the instant invention Oligonucleotides used as pomers for specific amplification may carry the mutation of interest in the center of the molecule (so that amplification depends on differentral hybndization) (Gibbs ef al (1989) Nucleic Acids Res 17 2437-2448) or at the extreme 3' end of one pnmer where, under appropnate conditions, mismatch can prevent, or reduce polymerase extension (Prossner (1993) Tibtech 11 238) In addition it may be desirable to introduce a novel restnction site m the region of the mutation to create cleavage-based detection See, e g , Gaspanni ef al (1992) Mol Cell Probes 6 1 It is anticipated that m certain embodiments amplification may also be performed using Taq hgase for amplification See, e g , Barany ( 1991 ) Proc Natl Acad Sci USA 88 189 In such cases, ligation will occur only if there is a perfect match at the 3' end of the 5' sequence, making it possible to detect the presence of a known mutation at a specific site by looking for the presence or absence of amplification The methods descnbed herein may be performed, for example, by utilizing pre-packaged diagnostic kits compnsmg at least one probe nucleic acid or antibody reagent described herein, which may be conveniently used, e g , m clinical settings to diagnose patients exhibiting symptoms or family history of a disease or illness involving a FGF-CX gene Furthermore, any cell type or tissue, preferably penpheral blood leukocytes, m which FGF-CX is expressed may be utilized in the prognostic assays descnbed herein However, any biological sample containing nucleated cells may be used, including, for example, buccal mucosal cells Pharmacogenomics Agents, or modulators that have a stimulatory or inhibitory effect on FGF-CX activity (e g , FGF-CX gene expression), as identified by a screening assay descobed herein can be administered to individuals to treat (prophylactically or therapeutically) disorders (e g , neurological, cancer-related or gestational disorders) associated with abeoant FGF-CX activity In conjunction w ith such treatment, the pharmacogenomics (i e , the study of the relationship betw een an individual's genotype and that individual's response to a foreign compound or drug) of the individual may be considered Differences in metabolism of therapeutics can lead to sev ere toxicity or therapeutic failure by altenng the relation between dose and blood concentration of the pharmacologically active drug Thus, the pharmacogenomics of the individual permits the selection of effective agents (e g , drugs) for prophylactic or therapeutic treatments based on a consideration of the individual's genotype Such pharmacogenomics can further be used to determine appropnate dosages and therapeutic regimens Accordingly, the activity of FGF-CX protein, expression of FGF-CX nucleic acid, or mutation content of FGF-CX genes m an individual can be determined to thereby select appropnate agent(s) for therapeutic or prophylactic treatment of the individual Pharmacogenomics deals with clinically significant hereditary vaoations in the response to drugs due to altered drug disposition and abnormal action in affected persons See e g , Eichelbaum, 1996 Clin Exp Pharmacol Plnsiol, 23 983-985 and Lmder, 1997, Clin Chem, 43 254-266 In general, two types of pharmacogenetic conditions can be differentiated Genetic conditions transmitted as a single factor altenng the way drugs act on the body (altered drug action) or genetic conditions transmitted as single factors altenng the way the body acts on drugs (altered drug metabolism) These pharmacogenetic conditions can occur either as rare defects or as polymorphisms For example, glucose-6-phosphate dehydrogenase (G6PD) deficiency is a common lnhented enzvmopathy m which the mam clinical complication is haemolysis after mgestion of oxidant drugs (anti-malaoals, sulfonamides, analgesics, mtrofurans) and consumption of fava beans As an illustrative embodiment, the activity of drug metabolizing enzymes is a major determinant of both the intensity and duration of drug action The discovery of genetic polymorphisms of drug metabolizing enzymes (e g , N-acetyltransferase 2 (NAT 2) and cytochrome P450 enzymes CYP2D6 and CYP2C19) has provided an explanation as to why some patients do not obtain the expected drug effects or show exaggerated drug response and senous toxicity after taking the standard and safe dose of a drug These polymorphisms are expressed in two phenotypes m the population, the extensive metabohzer (EM) and poor metabohzer (PM) The prevalence of PM is different among different populations For example, the gene coding for CYP2D6 is highly polymorphic and several mutatrons have been identified m PM. which all lead to the absence of functional CYP2D6 Poor metabohzers of CYP2D6 and CYP2C19 quite frequently expenence exaggerated drug response and side effects when they receive standard doses If a metabolite is the active therapeutic moiety, PM show no therapeutic response, as demonstrated for the analgesic effect of codeine mediated by its CYP2D6-formed metabolite morphine The other extreme are the so called ultra-rapid metabohzers who do not respond to standard doses Recently, the molecular basis of ultra-rapid metabolism has been identified to be due to CYP2D6 gene amplification Thus, the activity of FGF-CX protein, expression of FGF-CX nucleic acid, or mutation content of FGF-CX genes m an individual can be determined to thereby select appropnate agent(s) for therapeutic or prophylactic treatment of the individual In addition, pharmacogenetic studies can be used to apply genotyping of polymorphic alleles encoding drug-metabolizing enzymes to the identification of an individual's drug responsiveness phenotype This knowledge, when applied to dosmg or drug selection, can avoid adverse reactions or therapeutic failure and thus enhance therapeutic or prophylactic efficiency when treating a subject with a FGF-CX modulator, such as a modulator identified by one of the exemplary screening assays descnbed herein Monitoring Clinical Efficacy Monitoong the influence of agents (e g , drugs, compounds) on the expression or activity of FGF-CX (e g , the ability to modulate aberrant cell proliferation and/or differentiation) can be applied m basic drug screening and m clinical tnals For example, the effectiveness of an agent determined by a screening assay as descnbed herein to increase FGF- CX gene expression, protein levels, or upregulate FGF-CX activity, can be monitored in clinical tnals of subjects exhibiting decreased FGF-CX gene expression, protein levels, or downregulated FGF-CX activity Alternatively, the effectiveness of an agent determined by a screening assay to decrease FGF-CX gene expression, protein levels, or downregulate FGF- CX activity, can be monitored m clinical tnals of subjects exhibiting increased FGF-CX gene expression, protein levels, or upregulated FGF-CX activity In such clinical toals, the expression or activity of FGF-CX and, preferably, other genes that have been implicated in, for example, a proliferative or neurological disorder, can be used as a "read out" or marker of the responsiveness of a particular cell For example, genes, including FGF-CX, that are modulated m cells by treatment with an agent (e g , compound, drug or small molecule) that modulates FGF-CX activity (e g , identified in a screening assav as descnbed herein) can be identified Thus, to study the effect of agents on cellular proliferation disorders, for example, in a clinical tnal, cells can be isolated and RNA prepared and analyzed for the levels of expression of FGF-CX and other genes implicated in the disorder The levels of gene expression (i e , a gene expression pattern) can be quantified by Northern blot analysis or RT-PCR, as descnbed herein, or alternatively by measuong the amount of protein produced, by one of the methods as descobed herein, or by measunng the levels of activity of FGF-CX or other genes In this way, the gene expression pattern can serve as a marker, indicative of the physiological response of the cells to the agent Accordingly, this response state may be determmed before, and at vaoous points duong, treatment of the individual with the agent In one embodiment, the invention provides a method for momtoong the effectiveness of treatment of a subject with an agent (e g , an agonist, antagonist, protein, peptide, nucleic acid, peptidomimetic, small molecule, or other drug candidate identified by the screening assays descobed herein) composing the steps of (ή obtaining a pre-admmistration sample from a subject poor to administration of the agent, (u) detecting the level of expression of a FGF-CX protein, mRNA, or genomic DNA in the preadministration sample, (in) obtaining one or more post-admmistration samples from the subject, (iv) detecting the level of expression or activity of the FGF-CX protein, mRNA, or genomic DNA in the post-administration samples, (v ) compaong the level of expression or activity of the FGF-CX protein, mRNA, or genomic DNA in the pre-admmistration sample with the FGF-CX protein, mRNA, or genomic DNA in the post administration sample or samples, and (vi) alteong the administration of the agent to the subject accordingly For example, increased administration of the agent may be desirable to increase the expression or activity of FGF-CX to higher levels than detected, i e , to increase the effectiveness of the agent Alternatively, decreased administration of the agent may be desirable to decrease expression or activity of FGF-CX to lower levels than detected, / e , to decrease the effectiveness of the agent Methods of Treatment The present invention provides for both prophylactic and therapeutic methods of treating a subject at osk of (or susceptible to) a disorder or having a disorder associated with aberrant FGF-CX expression or activity Diseases and disorders that are charactenzed by increased (relative to a subject not suffering from the disease or disorder) lev els or biological activity may be treated with Therapeutics that antagonize (ι e . reduce or inhibit) activity Therapeutics that antagonize activity may be administered in a therapeutic or prophylactic manner Therapeutics that may be utilized include, but are not limited to (i) a FGF-CX polypeptide, or analogs, derivatives, fragments or homologs thereof, (u) antibodies to a FGF-CX peptide, (in) nucleic acids encoding a FGF-CX peptide, (iv) administration of antisense nucleic acid and nucleic acids that are "dysfunctional" (i e due to a heterologous insertion within the coding sequences of coding sequences to a FGF-CX peptide) that are utilized to "knockout" endogenous function of a FGF-CX peptide by homologous recombination (see, e g , Capecchi, 1989, Science 244 1288-1292), or (v) modulators (i e , inhibitors, agonists and antagonists, including additional peptide mimetic of the invention or antibodies specific to a peptide of the invention) that alter the interaction between a FGF-CX peptide and its binding partner Diseases and disorders that are characteozed by decreased (relative to a subject not suffeong from the disease or disorder) levels or biological activity may be treated with Therapeutics that increase (i e , are agonists to) activity Therapeutics that upregulate activity may be administered in a therapeutic or prophylactic manner Therapeutics that may be utilized include, but are not limited to, a FGF-CX peptide. or analogs, deovatives, fragments or homologs thereof, or an agonist that increases bioavailabihty Increased or decreased levels can be readily detected by quantifying peptide and/or RNA, by obtaining a patient tissue sample (e g , from biopsy tissue) and assaying it in vitro for RNA or peptide levels, structure and/or activity of the expressed peptides (or mRNAs of a FGF-CX peptide) Methods that are well-known withm the art include, but are not limited to, immunoassays (e g , by Western blot analysis, immunoprecipitation followed by sodium dodecyl sulfate (SDS) polyacrylamide gel electrophoresis, immunocytochemistry, etc ) and/or hybndization assays to detect expression of mRNAs (e g , Northern assays, dot blots, in situ hybodization, etc ) In one aspect, the invention provides a method for preventing, in a subject, a disease or condition associated with an abeoant FGF-CX expression or activity, by admimsteong to the subject an agent that modulates FGF-CX expression or at least one FGF-CX activity Subjects at osk for a disease that is caused or contobuted to by aberrant FGF-CX expression or activity can be identified by, for example, any or a combination of diagnostic or prognostic assays as descnbed herein Administration of a prophylactic agent can occur pnor to the manifestation of symptoms charactenstic of the FGF-CX aberrancy, such that a disease or disorder is prevented or. alternatively, delayed in its progression Depending on the type of FGF-CX aberrancy, for example, a FGF-CX agonist or FGF-CX antagonist agent can be used for treating the subject The appropnate agent can be determined based on screening assays descnbed herein Another aspect of the invention pertains to methods of modulating FGF-CX expression or activity for therapeutic purposes The modulatory method of the invention involves contacting a cell with an agent that modulates one or more of the activities of FGF-CX protein activity associated with the cell An agent that modulates FGF-CX protein activity can be an agent as descnbed herein, such as a nucleic acid or a protein, a naturally-occumng cognate ligand of a FGF-CX protein, a peptide, a FGF-CX peptidomimetic, or other small molecule In one embodiment, the agent stimulates one or more FGF-CX protein activity Examples of such stimulatory agents include active FGF-CX protein and a nucleic acid molecule encoding FGF-CX that has been introduced into the cell In another embodiment, the agent inhibits one or more FGF-CX protein activity Examples of such inhibitory agents include antisense FGF- CX nucleic acid molecules and anti-FGF-CX antibodies These modulatory methods can be performed in vitro (e g , by cultunng the cell with the agent) or, alternatively, in vivo (e g , by admimstenng the agent to a subject) As such, the present invention provides methods of treating an individual afflicted with a disease or disorder charactenzed by abeoant expression or activity of a FGF-CX protein or nucleic acid molecule In one embodiment, the method involves admimstenng an agent (e g , an agent identified by a screening assay descnbed herein), or combination of agents that modulates (e g , upregulates or downregulates) FGF-CX expression or activity In another embodiment, the method involves admimstenng a FGF-CX protein or nucleic acid molecule as therapy to compensate for reduced or abeoant FGF-CX expression or activity The invention will be further illustrated m the following non-limiting examples EXAMPLES Example 1. Identification of the FGF-CX gene The FGF-CX gene was identified following a TBLASTN (Altschul ef al 1990 J Mol Biol 215, 403-410) search of GenBank human genomic DNA sequences with Xenopus FGF- CX (Koga ef al 1999 Biochem Biophvs Res Comm 261, 756-765, Accession No AB012615) as query This search identified a locus (Accession No AB020858) of high homology on chromosome 8 Intron/exon boundaoes were deduced using standard consensus splicing parameters (Mount 1996 Science 271, 1690-1692), together with homologies deoved from known FGFs The FGF-CX initiation codon localizes to bp 16214 of the sequence of AB020858, and the remaining 3' portion of this exon continues to bp 15930 The 5' UTR of FGF-CX was extended upstream of the initiation codon by an additional 606 bp using public ESTs (Accession Nos AA232729, AA236522, AI272876 and AI272878) The remaining structure of the FGF-CX gene as it relates to locus AB020858 is as follows mtron 1 (bp 15929-9942), exon 2 (bp 9941-9838), intron 2 (bp 9837-7500), exon 3 (begins at bp 7499 and continuing as shown in FIG 13, the structure of the 3' UTR has not yet been determined) The gene discovered by the procedure in the preceding paragraph includes 3 exons and 2 introns (FIG 13) The DNA sequence predicts an ORF of 211 ammo acid residues, with an m-frame stop codon 117 bp upstream of the initiator methiomne The DNA segment from which the gene was mined maps to chromosome 8p21 3-p22, a location that was confirmed by radiation hybod analysis (see Example 2) An FGF signature motif, G-X-[LI]-X-[STAGP]-X(6,7)-[DE]-C-X-[FLM]-X-E-X(6)-Y, identified by a PROSITE search (Bucher & Bairoch 1994 Ismb 2: 53-61) located between ammo acid residues 125-148 is double-underlined, and intron exon boundaoes are depicted with arrows Introns 1 and 2 are 5988 bp and 2338 bp long, respectively The 5' UTR sequence was deoved from public ESTs, and is not shown m its entirety Example 2 Radiation Hybod Mapping of FGF-CX Radiation hybod mapping using human chromosome markers was earned out for FGF- CX The procedure used is analogous to that descobed in Steen ef αl (A High-Density Integrated Genetic Linkage and Radiation Hybod Map of the Laboratory Rat, Genome Research 1999 (Published Online on May 21, 1999)Vol 9, AP 1 -AP8, 1999) A panel of 93 cell clones containing the randomized radiation-mduced human chromosomal fragments was screened in 96 well plates using PCR pnmers designed to identify the sought clones in a unique fashion The DNA segment from which the nucleotide sequence encoding FGF-CX was identified was annotated as mapping to chromosome 8p21 3-p22 This result was refined by the present analysis by finding that FGF-CX maps to chromosome 8 at a locus which overlaps marker AFM177XB10, and which is 1.6 cR from marker WI-5104 and 3.2 cR from marker WI-9262. Example 3. Molecular Cloning of the Sequence Encoding a FGF-CX Protein Ohgonucleotide pnmers were designed for the amplification by PCR of a DNA segment, representing an open reading frame, coding for the full length FGF-CX. The forward pnmer includes a Bglll restnction site (AGATCT) and a consensus Kozak sequence (CCACC) The reverse pnmer contains an m-frame Xhol restnction site for further subclonmg purposes. Both the forward and the reverse pomers contain a 5' clamp sequence (CTCGTC). The sequences of the pomers are the following: FGF-CX-Forward: 5 " - CTCGTC AGATCT CCACC ATG GCT CCC TTA GCC GAA GTC - 3' (SEQ ID NO:3) FGF-CX-Reverse: 5' - CTCGTC CTCGAG AGT GTA CAT CAG TAG GTC CTT G - 3' (SEQ ID NO:4) PCR reactions were performed using a total of 5ng human prostate cDNA template, 1 μM of each of the FGF-CX-Forward and FGF-CX-Reverse pomers, 5 micromoles dNTP (Clontech Laboratooes, Palo Alto CA) and 1 microliter of 50xAdvantage-HF 2 polymerase (Clontech Laboratooes) m 50 microliter volume. The following PCR reaction conditions were used a) 96°C 3 minutes b) 96°C 30 seconds denaturation c) 70°C 30 seconds, primer annealing. This temperature was gradually decreased by l°C/cycle d) 72°C 1 minute extension. Repeat steps (b)-(d) ten times e) 96°C 30 seconds denaturation f) 60°C 30 seconds annealing g) 72°C 1 minute extension Repeat steps (e)-(g) 25 times h) 72°C 5 minutes final extension A single PCR product, with the expected size of approximately 640 bp, was isolated after electrophoresis on agarose gel and ligated into a pCR2.1 vector (Invitrogen, Carlsbad, CA) The cloned insert was sequenced using vector specific Ml 3 Forward(-40) and M13 Reverse pomers, which veofied that the nucleotide sequence was 100% identical to the sequence m FIG 1 (SEQ ID NO 1) inserted directly between the upstream Bglll cloning site and the downstream Xhol cloning site The cloned sequence constitutes an open reading frame coding for the predicted FGF-CX full length protein The clone is called TA-AB02085- S274-F19 Example 4 Preparation of Mammalian Expression Vector pCEP4/Sec The ohgonucleotide pomers pSec-V5-Hιs Forward (CTCGT CCTCG AGGGT AAGCC TATCC CTAAC (SEQ ID NO 14)) and pSec-V5-Hιs Reverse (CTCGT CGGGC CCCTG ATCAG CGGGT TTAAA C (SEQ ID NO 15)), were designed to amplify a fragment from the pcDNA3 l-V5Hιs (Invitrogen, Carlsbad. CA) expression vector that includes V5 and Hιs6 The PCR product was digested with Xhol and Apal and ligated into the Xhol/ Apal digested pSecTag2 B vector harboong an Ig kappa leader sequence (Invitrogen, Carlsbad CA) The cooect structure of the resulting ector, pSecV5Hιs, including an m-frame Ig-kappa leader and V5-Hιs6 was veofied by DNA sequence analysis The vector pSecV5Hιs was digested with Pmel and Nhel to provide a fragment retaining the above elements in the correct frame The Pmel-Nhel fragment was ligated into the BamHI/Klenow and Nhel treated vector pCEP4 (Invitrogen, Carlsbad, CA) The resulting vector was named pCEP4/Sec and includes an m-frame Ig kappa leader, a site for insertion of a clone of interest, and theV5 epitope and 6xHιs under control of the PCMV and/or the PT7 promoter pCEP4/Sec is an expression vector that allows heterologous protein expression and secretion bv fusing any protein into a multiple cloning site following the Ig kappa chain signal peptide Detection and puofication of the expressed protein are aided by the presence of the V5 epitope tag and 6xHιs tag at the C-terminus (Invitrogen, Carlsbad, CA) Example 5 Expression of FGF-CX in human embryonic kidney (HEK) 293 cells The Bglll-Xhol fragment containing the FGF-CX sequence was isolated from TA- AB02085-S274-F19 (Example 3) and subcloned into the BamHI-XhoI digested pCEP4/Sec to generate the expression vector pCEP4/Sec-FGF-CX The pCEP4/Sec-FGF-CX vector was transfected into 293 cells using the LipofectaminePlus reagent following the manufacturer's instructions (Gibco/BRL/Life Technologies. Rockville, MD) The cell pellet and supernatant were harvested 72 hours after transfection and examined for FGF-CX expression by Western blotting (reducing conditions) with an antι-V5 antibody FIG 12 shows that FGF-CX is expressed as a polypeptide having an apparent molecular weight (Mr) of approximately 34 kDa proteins secreted b 293 cells In addition a minor band is observed at about 31 LDa Example 6 Expression of FGF-CX in E coli The vector pRSETA (InVitrogen Inc , Carlsbad. CA) was digested with Xhol and Ncol restnction enzymes Ohgonucleotide linkers of the sequence 5' CATGGTCAGCCTAC 3' (SEQ ID NO 16) and 5' TCGAGTAGGCTGAC 3 ' (SEQ ID NO 17) were annealed at 37 degree Celsius and ligated into the Xhol-Ncol treated pRSETA The resulting vector was confirmed by restnction analysis and sequencing and was named pETMY The BgUI-XhoI fragment of the sequence encoding FGF-CX (see Example 3) was ligated into vector pETMY that was digested with BamHI and Xhol restnction enzymes The expression vector is named pETMY-FGF-CX In this vector, hFGF-CX was fused to the 6xHιs tag and T7 epitope at its N-termmus The plasmid pETMY-FGF-CX was then transfected into the E coli expression host BL21(DE3. pLys) (Novagen, Madison, WI) and expression of protein FGF-CX was induced according to the manufacturer's instructions After induction, total cells were harvested, and proteins were analyzed bv Western blotting using anti-HisGly antibody (Invitrogen. Carlsbad, CA) FIG 14 shows that FGF-CX was expressed as a protein of Mr approximately 32 kDa Example 7 Companson of Expression of Recombinant FGF-CX Protein With and Without a Cloned Signal Peptide a) Expression Without a Signal Peptide As noted m the Detailed Descnption of the Invention, FGF-CX apparently lacks a classical ammo-terminal signal sequence To determine whether FGF-CX is secreted from mammalian cells, cDNA obtained as the Bglϊl-Xliol fragment, encoding the full length FGF- CX protein, was subcloned from TA-AB02085-S274-F19 (Example 3) into BamHl/Xhol- digested pcDNA3 1 (Invitrogen) This provided a mammalian expression vector designated pFGF-CX This construct incorporates the V5 epitope tag and a polyhistidme tag into the carboxy-termmus of the protein to aid m its identification and punfication, respectively, and should generate a polypeptide of about 27 kDa Following transient transfection into 293 human embryonic kidney cells, conditioned media was harvested 48 hr post transfection In addition to secretion of FGF-CX into conditioned media, it also found to be associated with the cell pellet / extracellular matnx (ECM) fraction (data not shown) Since FGFs are known to bind to hepann sulfate proteoglycan (HSPG) present on the surface of cells and in the ECM, the inventors investigated whether FGF-CX was sequestered in this manner FGF-CX-transfected cells were extracted by treatment with 0 5 ml DMEM containing 100 μM suramm, a compound known to disrupt low affinity interactions between growth factors and HSPGs (La Rocca ef al 1990 Cancer Cells 2, 106-115), for 30 mm at 4°C The suramm- extracted conditioned media was then harvested and clanfied by centnfigation (5 min, 2000 X g) The conditioned media and the suramm extract were then mixed with equal volumes of 2X gel-loadmg buffer Samples were boiled for 10 mm, resolved by SDS-PAGE on 4-20% gradient polyacrylamide gels (Novex, Dan Diego, CA) under reducing conditions, and transfeoed to nitrocelluose filters (Novex) Western analysis was performed according to standard procedures using HRP-conjugated antι-V5 antibody (Invitrogen) and the ECL detection system (Amersham Pharmacia Biotech, Piscataway, NJ) One band having the expected Mr was identified in conditioned media from 293 cells transfected with pFGF-CX (FIG 1 1A, lane 1) Conditioned media from cells transfected with control vector did not react with the antibody (FIG 11 A, lane 5) After suramm treatment, it was found that a significant quantity of FGF-CX could in fact be released from the cell surface / ECM, indicating that HSPGs are likely to play a role in sequestenng this protein (FIG 11A, lane 2) These results indicate that FGF-CX can be secreted without a classical signal peptide Recombinant FGF-CX protein stimulates DNA synthesis and cell proliferation, effects that are likely to be mediated via high affinity binding of FGF-CX to a cell surface receptor, and modulated via low affinity interactions with HSPGs The suramm extraction data suggests that FGF-CX binds to HSPGs present on the cell surface and or the ECM b) Expression With a Signal Peptide With the goal of enhancing protein secretion, a construct (pCEP4/Sec-FGF-CX) was generated in which the FGF-CX cDNA was fused in frame with a cleavable ammo-terminal secretory signal sequence denved from the Igκ gene The resulting protein also contained carboxy-terminal V5 and polyhistidine tags as descobed above for pFGF-CX Following transfection into 293 cells, a protein product having the expected Mr of about 31 kDa was obtained, and suramm was again found to release a significant quantity of sequestered FGF- CX protein (FIG 11 A, lanes 3 and 4) As expected, pCEP4/Sec-FGF-CX generated more soluble FGF-CX protein than did pFGF-CX Results similar to those descobed above for 293 cells were also obtained with NIH 3T3 cells (FIG 11B) Example 8 Real Time Quantitative Expression Analysis Of FGF-CX Nucleic Acids Bv PCR The quantitative expression of v aoous clones was assessed in 41 normal and 55 tumor samples (in most cases, the samples presented in FIG 15A and FIG 15B are those identified in Table 3) by real time quantitative PCR (TAQMAN & analysis) performed on a Perkin-Elmer Biosystems ABI PRISM® 7700 Sequence Detection System First, 96 RNA samples were normalized to β-actm and glyceraldehyde-3-phosphate dehydrogenase (GAPDH) RNA (-50 ng total or ~1 ng polyA+) was converted to cDNA using the TAQMAN* Reverse Transcnption Reagents Kit (PE Biosystems, Foster City, CA, cat # N808-0234) and random hexamers according to the manufacturer's protocol Reactions were performed m 20 ul and incubated for 30 min at 48°C cDNA (5 ul) was then transferred to a separate plate for the TAQMAN® reaction using β-actin and GAPDH TAQMAN® Assay Reagents (PE Biosystems, cat no 's 4310881E and 4310884E, respectively) and TAQMAN® universal PCR Master Mix (PE Biosystems, cat # 4304447) according to the manufacturer's protocol Reactions were performed m 25 ul using the following parameters 2 mm at 50°C, 10 min at 95°C, 15 sec at 95°C/1 mm at 60°C (40 cycles) Results were recorded as CT values (cycle at which a given sample crosses a threshold level of fluorescence) using a log scale, with the difference m RNA concentration between a given sample and the sample with the lowest CT value being represented as 2 to the power of delta CT The percent relative expression is then obtained by taking the reciprocal of this RNA difference and multiplying by 100 The average CT values obtained for β-actm and GAPDH were used to normalize RNA samples The RNA sample generating the highest CT value required no further diluting, while all other samples were diluted relative to this sample according to their β-actin /GAPDH average CT values Normalized RNA (5 μl) was converted to cDNA and analyzed via TAQMAN® using One Step RT-PCR Master Mix Reagents (PE Biosystems, cat # 4309169) and gene-specific pomers according to the manufacturer's instructions Probes and pomers were designed for each assay according to Perkm Elmer Biosystem's Primer Express Software package (versron I for Apple Computer's Macintosh Power PC) using the sequence of clone 10326230 0 38 as input Default settings were used for reaction conditions and the following parameters were set before selecting pomers primer concentration = 250 nM, pomer melting temperature (T m ) range = 58°-60° C, pomer optimal Tm = 59° C, maximum pomer difference = 2° C, probe does not have 5' G, probe T m must be 10° C greater than pnmer T m , amphcon size 75 bp to 100 bp The probes and pomers selected (see below) were synthesized by Synthegen (Houston, TX, USA). Probes were double puofied by HPLC to remove uncoupled dye and evaluated by mass spectroscopy to veofy coupling of reporter and quencher dyes to the 5' and 3' ends of the probe, respectively. Their final concentrations were, forward and reverse pomers, 900 nM each, and probe, 200nM For PCR, normalized RNA from each tissue and each cell line was spotted in each well of a 96 well PCR plate (Perkm Elmer Biosystems). PCR cocktails including two probes (one specific for FGF-CX and a second gene-specific probe to serve as an internal standard) were set up using IX TaqMan™ PCR Master Mix for the PE Biosystems 7700, with 5 mM MgC12, dNTPs (dA, G, C, U at 1 : 1 : 1 :2 ratios), 0.25 U/ml AmphTaq Gold™ (PE Biosystems), and 0.4 U/μl RNase inhibitor, and 0.25 U/μl reverse transcoptase. Reverse transcoption was performed at 48° C for 30 mmutes followed by amphfication/PCR cycles as follows: 95° C 10 mm, then 40 cycles of 95° C for 15 seconds, 60° C for 1 minute. Table 3. Tissue Samples used m TaqMan Expression Analysis. No. Tissue Sample No Tissue Sample 1 Endothelial cells 49 Renal ca. 786-0 2 Endothelial cells (treated) 50 Renal ca. A498 3 Pancreas 51 Renal ca. RXF 393 4 Pancreatic ca. CAPAN 2 52 Renal ca. ACHN 5 Adipose 53 Renal ca. UO-31 6 Adrenal gland 54 Renal ca. TK-10 7 Thyroid 55 Liver 8 Salivary gland 56 Liver (fetal) 9 Pituitary gland 57 Liver ca. (hepatoblast) HepG2 10 Brain (fetal) 58 Lung 1 1 Brain (whole) 59 Lung (fetal) 12 Brain (amygdala) 60 Lung ca. (small cell) LX-1 13 Brain (cerebellum) 61 Lung ca. (small cell) NCI-H69 14 Brain (hippocampus) 62 Lung ca. (s.cell var.) SHP-77 15 Brain (hypothalamus) 63 Lung ca. (large cell)NCI-H460 16 Brain (substantia nigra) 64 Lung ca. (non-sm. cell) A549 17 Brain (thalamus) 65 Lung ca. (non-s.cell) NCI-H23 18 Spinal cord 66 Lung ca (non-s.cell) HOP-62 19 CNS ca. (glio/astro) U87-MG 67 Lung ca. (non-s.cl) NCI-H522 20 CNS ca. (gho/astro) U-1 18-MG 68 Lung ca. (squam.) SW 900 21 CNS ca. (astro) SW1783 69 Lung ca. (squam.) NCI-H596 22 CNS ca. * (neuro; met ) SK-N-AS 70 Mammary gland 23 CNS ca. (astro) SF-539 71 Breast ca. * (pi. effusion) MCF-7 24 CNS ca (astro) SNB-75 72 Breast ca. * (pl.ef) MDA-MB-231 25 CNS ca. (g o) SNB-19 73 Breast ca. * (pi. effusion) T47D 26 CNS ca (g o) U251 74 Breast ca. BT-549 27 CNS ca (gho) SF-295 75 Breast ca MDA-N 8 Heart 76 Ovary 9 Skeletal muscle 77 Ovarian ca. OVCAR-3 30 Bone marrow 78 Ovarian ca. OVCAR-4 31 Thymus 79 Ovarian ca OVCAR-5 32 Spleen 80 Ovarian ca OVCAR-8 33 Lymph node 81 Ovarian ca IGROV-1 34 Colon (ascending) 82 Ovarian ca * (ascites) SK-OV-3 35 Stomach 83 Myomet um 36 Small intestine 84 Uterus 37 Colon ca SW480 85 Placenta 38 Colon ca * (SW480 met)SW620 86 Prostate 39 Colon ca HT29 87 Prostate ca * (bone met)PC-3 40 Colon ca HCT-1 16 88 Testis 41 Colon ca CaCo-2 89 Melanoma Hs688(A) T 42 Colon ca HCT-15 90 Melanoma* (met) Hs688(B) T 43 Colon ca HCC-2998 91 Melanoma UACC-62 44 Gastric ca * (liver met) NC1-N87 92 Melanoma M14 45 Bladder 93 Melanoma LOX IMVI 46 Trachea 94 Melanoma* (met) SK-MEL-5 47 Kidney 95 Melanoma SK-MEL-28 48 Kidney (fetal) 96 Melanoma UACC-257 Key to Table 3 ca = carcinoma,* = established from metastasis, met = metastasis, s cell var= small cell vanant, non-s = non-sm =non-small, squam = squamous, pi eff = pi effusion = pleural effusion, gho = ghoma, astro = astrocytoma, and neuro = neuroblastoma The following pnmers and probe were designed Each possesses a minimum of three mismatches for corresponding regions of the highly homologous human FGF-9 and FGF-16 genes so as to be specific for FGF-CX Set Agδlb covers the region from base 270 to base 343 of FIG 1 (SEQ ID NO 1 ) It should not detect other known FGF family members The pnmers and probe utilized were Ag81b (F) 5'-GGACCACAGCCTCTTCGGTA-3 ' (SEQ ID NO 18), Ag81b (R) 5'- TGTCCACACCTCTAATACTGACCAG-3' (SEQ ID NO 19), and Ag81b (P) 5'-FAM-CCCACTGCCACACTGATGAATTCCAA-TAMRA-3' (SEQ ID NO 20) The results from a representative expenment are shown in FIG 15A and FIG 15B Expression is plotted as a percentage of the sample exhibiting the highest level of expression Four replicate runs were made, presented in vanously shaded bars In 39 normal human tissues examined, FGF-CX was found to be most highly expressed m the brain, particularly the cerebellum (FIG 15A and FIG 15B) Other tissues of the central nervous system expressed much lower levels of FGF-CX Of the 54 human tumor cell lines examined, FGF-CX was found to be most highly expressed m a lung carcinoma cell line (LX-1), a colon carcinoma cell line (SW-480) a colon cancer cell line and metastasis (SW480) and a gastnc carcinoma cell line (NCI-N87, see FIG 15A and FIG 15B) Additional real time expression analysis was done on an extensive panel of tumor tissues obtained dunng surgerv These tissues include portions obtained from the actual tumors themselves, as well as the portions termed "normal adjacent tissue (NAT)", which typically are already inflamed and show histological evidence of dysplasia A pomer-probe set (Ag81) selected to be specific for FGF-CX was employed in a TaqMan expeoment with such surgical tissue samples, in which two replicate runs were performed Ag81 (F) 5 ' -AGGCAGAAGCGGGAGATAGAT- 3 ' (SEQ ID NO 21), Ag81 (R) 5'-AGCAGCTTTACCTCATTCACAATG-3' (SEQ ID NO 22), and Ag81 (P) TET-5'-CCATCTACATCCACCACCAGTTGCAGAA-3'-TAMRA (SEQ ID NO 23) Set Ag81 covers the region from base 477 to base 554 of FIG 1 (SEQ ID NO 1) The replicates are shown as bars of grey and black shading in FIG 15C and FIG 15D The results show dramatically that for many matched pairs of tumors and their dysplastic NAT samples, FGF-CX is highly expressed in the NAT but not m the tumor itself, more specifically, m the parenchymal cells adjacent to the tumor Examples in which this matched pattern anses include ovanan cancer, bladder cancer, utenne cancer, lung cancer, prostate cancer and liver cancer Without being limited by theory, it is believed from the results in FIG 15C and FIG 15D that FGF-CX may contobute to tumor progression by paracone stimulation of the tumor epithelium and/or other components m the host tissue (endothelial cells, stromal fibroblasts, infiltrating lymphocytes, and similar cell types) Likewise, FGF-CX may function to stimulate the components in the host tissue that synthesize or secrete FGF-CX in an autocone manner These host component cells may subsequently act on the tumor compartment The elevated expression profile of FGF-CX relative to unmatched normal tissue suggests that it plays a prospective or promoting role in tumor progression Therefore, therapeutic targeting of FGF-CX using any of a number of targeting approaches (including, by way of nonlimitmg example, monoclonal antibodies, obozymes, antisense oligonucleotides, peptides that neutralize the interaction of FGF-CX with cognate receptor(s), and small drugs that modulate the unidentified receptor for FGF-CX) is anticipated to have a positive therapeutic impact on disease progression Likewise, the use of such agents to modulate the bioactivity of FGF-CX in tumor progression is anticipated to synergize or enhance conventional chemotherapy and radiotherapy Specific disease indications where therapeutic targeting of FGF-CX might be applied include adenocarcinomas of the colon, prostate, lung, kidney, uterus, breast, bladder, ovary Example 9 Stimulation of Bromodeoxyundine Incorporation bv Recombinant FGF-CX 293-EBNA cells (Invitrogen) were transfected using Lipofectamine 2000 according to the manufacturer's protocol (Life Technologies, Gaithersburg, MD) Cells were supplemented with 10% fetal bovme serum (FBS, Life Technologies) 5 hr post-transfection To generate protein for BrdU and growth assays (Example 10), cells were washed and fed with Dulbecco's modified Eagle medium (DMEM, Life Technologies) 18 hr post-transfection After 48 hr, the media was discarded and the cell monolayer was incubated with 100 μM suramm (Sigma, St Louis MO) in 0 5 ml DMEM for 30 mm at 4°C The suramm-extracted conditioned media was then removed, clanfied by centnfugation (5 mm, 2000 X g), and subjected to TALON metal affinity chromatography according to the manufacturer's instructions (Clontech, Palo Alto, CA) taking advantage of the carboxy-terminal polyhistidme tag Retained fusion protein was released by washing the column with lmidazole FGF-CX protein concentrations were estimated by Western analysis using a standard curve generated with a V5-tagged protein of known concentration For Western analysis, conditioned media was harvested 48 hr post transfection, and the cell monolayer was then incubated with 0 5 ml DMEM containing 100 μM suramm for 30 mm at 4°C The suramin- containing conditioned media was then harvested To generate control protein, 293-EBNA cells were transfected with pCEP4 plasmid (Invitrogen) and subjected to the punfication procedure outlined above Recombinant FGF-CX was tested for its ability to induce DNA synthesis in a bromodeoxvundine (BrdU) incorporation assay NIH 3T3 cells (ATCC number CRL-1658, Ameocan Type Culture Collection, Manassas, VA), CCD-1070Sk cells (ATCC Number CRL-2091) or MG-63 cells (ATCC Number CRL-1427) were cultured in 96-well plates to -100% confluence, washed with DMEM, and serum-starved in DMEM for 24 hr (NIH 3T3) or 48 hr (CCD-1070Sk and MG-63) Recombinant FGF-CX or control protein was then added to the cells for 18 hr The BrdU assay was performed according to the manufacturer's specifications (Roche Molecular Biochemicals, Indianapolis, IN) using a 5 hr BrdU incorporation time It was found that FGF-CX induced DNA synthesis in NIH 3T3 mouse fibroblasts at a half maximal concentration of -5 ng/ml (FIG 16A) In contrast, protein puofied from cells transfected with control vector did not induce DNA synthesis It was also found that FGF-CX induces DNA synthesis, as determined by BrdU incorporation, at comparable dosmg levels in a vaoety of human cell lines including CCD-1070Sk normal human skm fibroblasts (FIG 16B), CCD-1106 keratinocytes (FIG 16C), MG-63 osteosarcoma cells (data not shown), and breast epithelial cells Example 10 Induction of Cell Proliferation bv Recombinant FGF-CX To determine if recombinant FGF-CX induces cell proliferation, NIH 3T3 cells were cultured in 6-well plates to -50% confluence, washed with DMEM, and fed with DMEM containing recombinant FGF-CX or control protein tor 48 hr, and then counted Cell numbers were determined by trypsmizing the cells and counting them with a Beckman Coulter Zl senes counter (Beckman Coulter, Fullerton, CA) It was found that FGF-CX induces about a 3-fold increase in cell number relative to control protein in this assay (FIG 17) To document morphological changes incident upon proliferation, NIH 3T3 cells were treated for 48 hr with recombinant FGF-CX or control protein in DMEM/2% calf serum and photographed with a Zeiss Axiovert 100 microscope (Carl Zeiss, Inc , Thornwood, NY) In addition to reaching a higher cell density (FIG 17), NIH 3T3 cells cultured m the presence of FGF-CX prepared as descnbed in Example 9 exhibited a disorganized pattern of growth, indicating a loss of contact inhibition (FIG 18) Furthermore, individual cells were found to be spindly and retractile These results show that FGF-CX acts as a growth factor and suggest that recombinant FGF-CX mediates the morphological transformation of NIH 3T3 cells Example 11 Tumor Formation by Ectopic FGF-CX-Transfected NIH 3T3 Cells m Nude NIH 3T3 cells were transfected with pCEP4/Sec-FGF-CX or control vector using Lipofectamme Plus according to the manufacturer's protocol (Life Technologies) Cells were supplemented with 10% calf serum (CS, Life Technologies) 5 hr post-transfection It was found that pCEP4/Sec-FGF-CX-transfected cells were morphologrcally transformed by 48 hr after transfection, and remained so after 2 weeks of selection in hygromycm-containmg growth media In contrast, cells transfected with control vector retained their normal morphology (data not shown) Thus the transfected cells behave as expected based, for example, on the expeoments reported in Example 10 In order to study the induction of ectopic tumors, NIH 3T3 cells were transfected with vaoous expeomental and control vectors Two days after transfection, cells were placed into either DMEM/5% CS (for pFGF-CX-transfected cells) or DMEM/ 10% CS supplemented with 500 μg/ml hygromycin B (for pCEP4/Sec-FGF-CX-transfected cells) After 2 weeks of culture, subconfluent cells were trypsrmzed, neutrahzed with DMEM/10%o CS, washed with PBS and counted One million cells in PBS were injected into the lateral subcutis of female athymic nude mice (Jackson Laboratooes, Bar Harbor, ME) NIH 3T3 cells w ere transfected with FGF-CX expression plasmids (pFGF-CX and pIgκ-FGF-CX) or their appropoate control vectors We found that cells transfected with either of the FGF-CX expression vectors were morphologically transformed by 48 hr after transfection (data not shown), and possessed a phenotype similar to that generated following exposure of NIH 3T3 cells to recombinant FGF-CX (FIG 17) In contrast, cells transfected with control vector retained their normal morphology (data not shown) To determine if ectopic expression of FGF-CX in vivo induces the tumongemcity of NIH 3T3 cells, stable transfectants were generated and injected subcutaneously into nude mice By 11 days, all of the animals injected with either pFGF-CX or pIgκ-FGF-CX- transfected cells possessed rapidly growing tumors increasing in size by 14 days, whereas none of the animals injected with control cells developed tumors by 2 weeks (FIG 19) These results show that cells transformed by transfection with vectors harbonng the FGF-CX gene promote the development and growth of tumors in vivo EQUIVALENTS From the foregoing detailed descnption of the specific embodiments of the invention, it should be apparent that particular novel compositions and methods involving nucleic acids, polypeptides, antibodies, detection and treatment have been descnbed Although these particular embodiments have been disclosed herein in detail, this has been done by way of example for purposes of illustration only, and is not intended to be limiting with respect to the scope of the appended claims that follow In particular, it is contemplated by the inventors that vaoous substitutions, alterations, and modifications may be made as a matter of routine for a person of ordinary skill m the art to the invention without departing from the spiot and scope of the invention as defined by the claims Indeed, vaoous modifications of the invention in addition to those descobed herein will become apparent to those skilled in the art from the foregoing descoption and accompanying figures Such modifications are intended to fall withm the scope of the appended claims

Claims: What is claimed is: 1 An isolated polypeptide composing an ammo acid sequence selected from the group consisting of a) an ammo acid sequence given by SEQ ID NO 2, b) a vaoant of an ammo acid sequence given by SEQ ID NO 2, in which any amino acid specified m the chosen sequence is changed to a different ammo acid, provided that no more than 15% of the amino acid residues in the sequence are so changed, c) a mature form of an ammo acid sequence given by SEQ ID NO 2, and d) a vaoant of a mature form of an ammo acid sequence given by SEQ ID NO 2, wherein any amino acid in the mature form of the chosen sequence is changed to a different ammo acid, provided that no more than 15% of the ammo acid residues in the sequence of the mature form are so changed, and e) a fragment of an amino acid sequence descnbed m paragraphs (a) to (d) 2 A fragment of a polypeptide descobed in claim 1 3 The polypeptide of claim 1, wherein said polypeptide is a naturally occumng allehc vanant of SEQ ID NO 2 4 The polypeptide of claim 3, wherem the vanant is the translation of a single nucleotide polymorphism 5 The polypeptide of claim 1 , wherein said polypeptide is a vanant polypeptide, and wherem one or more of any ammo acid specified in SEQ ID NO 2 is changed to provide a conservative substitution 6 An isolated nucleic acid molecule composing a nucleic acid sequence encoding a polypeptide composing an amino acid sequence selected from the group consisting of a) a polypeptide composing SEQ ID NO 2, b) a vaoant of SEQ ID NO.2. in which any amino acid specified in the chosen sequence is changed to a different amino acid, provided that no more than 15% of the ammo acid residues m the sequence are so changed; c) a mature form of the amino acid sequence given by SEQ ID NO:2; and d) a vaoant of a mature form of the ammo acid sequence given by SEQ ID NO:2, wherem any amino acid in the mature form of the chosen sequence is changed to a different ammo acid, provided that no more than 15% of the amino acid residues in the sequence of the mature form are so changed; e) a fragment of an ammo acid sequence descnbed m (a) to (d); and f) the complement of any one of the nucleic acid molecules descobed in paragraphs (a) to (e) 7 The nucleic acid molecule of claim 6, wherem the nucleic acid molecule comprises the nucleotide sequence of a naturally occurong allehc nucleic acid vanant. 8 The nucleic acid molecule of claim 6, wherem said nucleic acid molecule encodes a vaoant polypeptide that has the polypeptide sequence of a naturally occurong polypeptide vanant. 9 The nucleic acid molecule of claim 6, wherem the nucleic acid molecule compnses a single nucleotide polymorphism encoding said vanant polypeptide 10 The nucleic acid molecule of claim 6, wherein said nucleic acid molecule compnses a nucleotide sequence selected from the group consisting of a) a nucleotide sequence given by SEQ ID NOT , b) a nucleotide sequence wherem one or more nucleotides in a nucleotide sequence given by SEQ ID NO 1 is changed from that given by the chosen sequence to a different nucleotide provided that no more than 20% of the nucleotides are so changed; c) a nucleic acid fragment of the sequence descnbed in (a); d) a nucleic acid fragment of the sequence descnbed in (b); and e) the complement of any one of said nucleic acid molecules. 11 The nucleic acid molecule of claim 6, wherem the nucleic acid molecule compnses a nucleotide sequence in which any nucleotide specified in the coding sequence of the chosen nucleotide sequence is changed from that given by the chosen sequence to a different nucleotide provided that no more than 20% of the nucleotides in the chosen coding sequence are so changed 12 An isolated nucleic acid molecule encoding a fragment of an FGF-CX polypeptide 13 The nucleic acid molecule of claim 12, wherem said FGF-CX polypeptide is a vanant of SEQ ID NO 2 14 The nucleic acid molecule of claim 12,whereιn said FGF-CX polypeptide is a mature FGF-CX polypeptide 15 The nucleic acid molecule of claim 12, wherein said FGF-CX polypeptide is a vanant of a mature form of SEQ ID NO 2 16 A vector compnsmg the nucleic acid molecule of claim 6 17 A cell compnsmg the vector of claim 16 18 An antibody that binds immunospecifically to the polypeptide of claim 1 19 The antibody of claim 18, wherem said antibody is a monoclonal antibody 20 The antibody of claim 18, wherein the antibody is a humanized antibody or a human antibody 21 A method for determining the presence or amount of a polypeptide of claim 1 in a sample, the method compnsmg (a) providing the sample, (b) contacting the sample with an antibody that binds immunospecifically to the polypeptide, and (c) determining the presence or amount of antibody bound to said polypeptide, thereby determining the presence or amount of polypeptide in said sample 22 A method for determining the presence or amount of a nucleic acid molecule of claim o in a sample, the method composing (a) providing the sample, (b) contacting the sample with a probe that binds to said nucleic acid molecule, and (c) determining the presence or amount of the probe bound to said nucleic acid molecule, thereby determining the presence or amount of the nucleic acid molecule m said sample 23 A method for identifying an agent that binds to a polypeptide of claim 1, the method compnsmg (a) contacting said polypeptide with a candidate substance, and (b) determining whether said candidate substance binds to said polypeptide, wherem a candidate substance that binds is the agent 24 The method of claim 23 wherein the candidate substance has a molecular weight not more than about 1500 Da 25 A method for modulating an activity of the polypeptide of claim 1, the method composing contacting the polypeptide with a compound that binds to the polypeptide in an amount sufficient to modulate the activity of the polypeptide 26 A method for identifying a potential therapeutic agent for use in treatment of a pathology, wherein the pathology is related to abeoant expression, abeoant processing, or abeoant physiological interactions of a polypeptide of claim 1, the method composing (a) providing a cell expressing the polypeptide and having a property or function ascnbable to the polypeptide, (b) contacting the cell provided in step (a) with a test agent, and (c) determining whether the test agent alters the property or function ascobable to the polypeptide, whereby an alteration of the property or function of the polypeptide observed in the presence of the test agent indicates the test agent is a potential therapeutic agent. 27 The method of claim 26, further composing subjecting the potential therapeutic agent to additional tests to identify the therapeutic agent 28. The method of claim 26, wherem the candidate substance is an antibody or has a molecular weight not more than about 1500 Da. 29 The method of claim 26, wherem the property or function composes cell growth or cell proliferation. 30 The method of claim 29, wherem the test agent binds to the polypeptide 31. A therapeutic agent identified according to the method of claim 26. 32 A therapeutic agent identified using the method of claim 27 33 The therapeutic agent of claim 31 , wherem the agent is an antibody or has a molecular weight not more than about 1500 Da. 34 A method of treating or preventing a disorder associated with a polypeptide descobed in claim 1, wherein the disorder is characteozed by insufficient or ineffective growth of a cell or a tissue, said method composing admimsteong to a subject a polypeptide of claim 1 in an amount and for a duration sufficient to treat or prevent said polypeptide-associated disorder in said subject, wherein the subject is thought to be prone to or to be suffeong from the disorder 35. The method of claim 34, wherem said subject is a human. 36 A method of treating or preventing a disorder associated with abeoant expression, abeoant processing, or abeoant physiological interactions of a protein descobed in claim 1 , wherem the disorder is charactenzed by insufficient or ineffective growth of a cell or a tissue, said method compnsmg admimstenng to a subject a nucleic acid descnbed in claim 6 m an amount and for a duration sufficient to treat or prevent said disorder in said subject, wherein the subject is thought to be prone to or to be suffenng from the disorder 37 The method of claim 36, wherem said subject is a human 38 A method of treating or preventing a disorder associated with abeoant expression, abeoant processing, or abeoant physiological interactions of a polypeptide descobed m claim 1. wherein the disorder is characteozed by hyperplasia or neoplasia of a cell or a tissue, said method compnsmg admimstenng to a subject a Therapeutic in an amount sufficient to treat or prevent said disorder in said subject, wherem the subject is thought to be prone to or to be suffenng from the disorder 39 The method descnbed m claim 38 wherein the Therapeutic is the antibody descnbed in claim 18 40 The method of claim 38, wherem the subject is a human 41 A pharmaceutical composition composing the polypeptide of claim 1 and a phaonaceutically acceptable earner 42 A pharmaceutical composition compnsmg the nucleic acid molecule of claim 6 and a phaonaceutically acceptable earner 43 A pharmaceutical composition composing the antibody of claim 18 and a phaonaceutically acceptable earner 44 A pharmaceutical composition composing the therapeutic agent of claim 31 and a pharmaceutically acceptable carrier 45 The pharmaceutical composition of claim 44, wherein the therapeutic agent has a molecular weight not more than about 1500 Da 46 A kit composing in one or more containers a pharmaceutical composition of claim 41 47 A kit composing in one or more containers a pharmaceutical composition of claim 42 48 A kit composing in one or more containers a pharmaceutical composition of claim 43 49 A method for screening for a modulator of latency or predisposition to a disorder associated with abeoant expression, abeoant processing, or aberrant physrological interactions of a polypeptide descobed in claim 1, said method composing a) providing a test animal at increased osk for the disorder and wherem said test animal recombinantly expresses the polypeptide of claim 1 , b) admimstenng a test compound to the test animal, c) measunng an activity of said polypeptide in said test animal after admimstenng the compound of step (a), and d) companng the activity of said protein in said test animal with the activity of said polypeptide in a control animal not administered said compound, wherem a change in the activity of said polypeptide in said test animal relative to said control animal indicates the test compound is a modulator of latency of or predisposition to the disorder 50 The method of claim 49, wherem said test animal is a recombinant test animal that expresses a test protein transgene or expresses said transgene under the control of a promoter at an increased level relative to a wild-type test animal, and wherein said promoter is not the native gene promoter of said transgene 51 A method for determining the presence of or predisposition to a disease associated with altered levels of a polypeptide descnbed in claim 1 m a first mammalian subject, the method compnsmg a) measunng the level of expression of the polypeptide in a sample from the first mammalian subject, and b) companng the amount of said polypeptide in the sample of step (a) to the amount of the polypeptide present in a control sample from a second mammalian subject known not to have, or not to be predisposed to, said disease, wherem an alteration in the expression level of the polypeptide in the first subject as compared to the control sample indicates the presence of or predisposition to said disease 52 A method for determining the presence of or predisposition to a disease associated with altered levels of a nucleic acid molecule descnbed in claim 6 in a first mammalian subject, the method compnsmg a) measunng the amount of the nucleic acid in a sample from the first mammalian subject, and b) companng the amount of said nucleic acid in the sample of step (a) to the amount of the nucleic acid present in a control sample from a second mammalian subject known not to have or not be predisposed to, the disease, wherem an alteration in the level of the nucleic acid in the first subject as compared to the control sample indicates the presence of or predisposition to the disease 53 A method of treating a pathological state in a mammal, wherem the pathology is related to abeoant expression, abeoant processing, or abeoant physiological interactions of a polypeptide descobed in claim 1 , the method composing admimsteong to the mammal a polypeptide m an amount that is sufficient to alleviate the pathological state, wherem the polypeptide is a polypeptide having an ammo acid sequence at least 95% identical to a polypeptide composing an ammo acid sequence of SEQ ID NO 2, or a biologically active fragment thereof 54 A method of treating a pathological state m a mammal, wherein the pathology is related to abeoant expression, abeoant processing, or abeoant physiological interactions of an FGF-CX polypeptide, the method composing admimsteong to the mammal an antibody descobed in claim 18 in an amount and for a duration sufficient to alleviate the pathological state. 55. A method of promoting growth of cells in a subject composing administering to a subject in need thereof a polypeptide descobed in claim 1 in an amount and for a duration that are effective to promote cell growth. 56. The method of claim 55, wherein the subject is a human. 57. The method described in claim 55 wherein the cells whose growth is to be promoted are chosen from the group consisting of cells in the vicinity of a wound, cells in the vascular system, cells involved in hematopoiesis, cells involved in erythropoiesis, cells in the lining of the gastrointestinal tract, and cells in hair follicles. 58. A method of inhibiting growth of cells in a subject, wherein the growth is related to expression of a polypeptide described in claim 1, comprising administering to the subject a composition in an amount sufficient to inhibit growth of cells in said subject. 59. The method of claim 58, wherein the composition inhibits the cleavage of an FGF-CX polypeptide. 60. The method of claim 58, wherein the composition comprises an ant FGF-CX antibody or a FGF-CX therapeutic agent. 61. The method of claim 58, wherein the subject is a human. 62. The method of claim 58, wherein the cells whose growth is to be inhibited are chosen from the group consisting of transformed cells, hyperplastic cells, tumor cells, and neoplastic cells.

Inventors: BOLDOG FERENC L, BURGESS CATHERINE, FERNANDES ELMA, HERRMANN JOHN L, JEFFERS MICHAEL, LAROCHELLE WILLIAM J, LICHENSTEIN HENRI, PRAYAGA SUDHIRDAS K, SHIMKETS RICHARD A, YANG MEIJIA, BOLDOG, FERENC, L., BURGESS, CATHERINE, FERNANDES, ELMA, HERRMANN, JOHN, L., JEFFERS, MICHAEL, LAROCHELLE, WILLIAM, J., LICHENSTEIN, HENRI, PRAYAGA, SUDHIRDAS, K., SHIMKETS, RICHARD, A., YANG, MEIJIA
Applicants: BOLDOG FERENC L, BURGESS CATHERINE, CURAGEN CORP, FERNANDES ELMA, HERRMANN JOHN L, JEFFERS MICHAEL, LAROCHELLE WILLIAM J, LICHENSTEIN HENRI, PRAYAGA SUDHIRDAS K, SHIMKETS RICHARD A, YANG MEIJIA, BOLDOG, FERENC, L., BURGESS, CATHERINE, CURAGEN CORPORATION, FERNANDES, ELMA, HERRMANN, JOHN, L., JEFFERS, MICHAEL, LAROCHELLE, WILLIAM, J., LICHENSTEIN, HENRI, PRAYAGA, SUDHIRDAS, K., SHIMKETS, RICHARD, A., YANG, MEIJIA
Application year: 2000
Main classification: C12N15
IPC codes: A01K67, A61K31, A61K38, A61K39, A61K45, A61K48, A61P1, A61P7, A61P9, A61P17, A61P35, A61P43, C07K14, C07K16, C12N1, C12N5, C12N15, C12P21, C12Q1, G01N33