CYTOKINE SIGNAL REGULATORS

Abstract: The invention provides human cytokine signal regulators (CKSR) and polynucleotides which identify and encode CKSR. The invention provides expression vectors, host cells, antibodies, agonists, and antagonists. The invention also provides methods for diagnosing, treating, or preventing disorders associated with expression of CKSR.

Description: CYTOKINE SIGNAL REGULATORS TECHNICAL FIELD This invention relates to nucleic acid and amino acid sequences of cytokine signal regulators and to the use of these sequences in the diagnosis, treatment, and prevention of cell proliferative and immune disorders. BACKGROUND OF THE INVENTION Cytokines are chemicals produced by one cell to affect a response in another cell. Cytokines are secreted proteins, found in the extracellular environment, which interact with specific target cells to communicate information regarding the status of the organism. In this way, cytokines control the survival, growth, and differentiation of cells by eliciting an appropriate biological response in the target tissue. For example, cytokines are produced in response to a microbial infection and trigger increased white blood cell production, function, and chemotaxis. Cytokines may be constitutively produced to maintain a steady state, such as continued cell survival and selection within the nervous system. Examples of cytokines include growth factors, interleukins, and interferons. Cytokines interact with a target through receptors expressed on the surface of the responsive cell. Cytokines bind with hemopoietin receptors, receptor kinases. and tumor necrosis factor (TNF)/nerve growth factor (NGF) receptors by bringing together two receptor subunits. This dimerization of receptor subunits transmits a signal through the plasma membrane to the cell cytoplasm. In the case of protein kinase receptors, such as the receptors for epidermal growth factor (EGF) and insulin, the juxtaposition of the two receptor subunit cytoplasmic domains activates their intrinsic tyrosine kinase activity. As a result, the subunits phosphoryiate each other. The resulting phosphorylated tyrosine residues then interact with cytoplasmic proteins containing src homology 2 (SH2) domains. SH2-containing proteins that interact with phosphorylated receptor molecules include phosphatidylinositol 3'-kinase, src kinase family members. GRB2, and she. These SH2 containing proteins are often associated with other cytoplasmic proteins, such as members of the small, monomeric GTP-binding protein families Ras and Rho, and phosphatases. such as the phosphotyrosine phosphatase SHP-2. The signaling complexes formed by these interactions can initiate signal cascades, such as the kinase cascade involving raf and mitogen activated protein (MAP) kinase, which result in transcriptional regulation and cytoskeleton reorganization. Hemopoietin and TNF/NGF receptors, though they have no intrinsic kinase activity, still activate many of the same signal cascades within responding cells. Many of the kinases involved in cytokine signaling cascades were first identified as products of oncogenes in cancer cells in which kinase activation was no longer subject to normal cellular controls. In fact, about one third of the known oncogenes encode protein kinases. Furthermore, cellular transformation (oncogenesis) is often accompanied by increased tyrosine phosphorylation activity (Carbonneau. H. and N.K. Tonks ( 1992) Annu. Rev. Cell Biol. 8:463-93). Thus, the cell must have regulatory systems which keep the cytokine signaling cascades under appropriate control. Eps8 is a protein which associates with and is phosphorylated by the EGF receptor. Human tumor cell lines contain high constitutive levels of tyrosine-phosphorylated Eps8. and overexpression of Eps8 in NIH3T3 cells expressing the EGF receptor (EGFR) leads to an enhanced mitogenic response and cell overgrowth (Provenzano, C. et al. ( 1998) Exp. Cell Res. 242: 186-200). A family of molecules, which include ABI (Abl interactor protein )- l and ABI-2/e3B l , interact with tyrosine kinases, such as the src-like kinase Abl, and Eps8. Overexpression of ABI-2/e3B l in NIH3T3 cells expressing EGFR inhibits the mitogenic response and cell growth. Thus, the ABI family of proteins function as negative regulators of cytokine signaling (Ziemnicka-Kotula, D. et al. ( 1998) J. Biol. Chem. 273: 13681 - 13692). The SH2-containing phosphotyrosine phosphatases. SHP- 1 and SHP-2. are involved in cytokine signaling. SHP-1 , the hemopoietic cell phosphatase, is a potent inhibitor of signaling, whereas SHP-2 is a positive signal transducer for several cytokines. A family of transmembrane glycoproteins. called SIRPs (signal regulatory proteins), are substrates of tyrosine kinases. Phosphorylated SIRPs bind to SHP-2 and have a negative effect on cell response induced by cytokines. including an inhibition of growth factor-induced DNA synthesis. This inhibition correlates with reduced MAP kinase activation in SIRP-transfected NIH3T3 cells stimulated with insulin or EGF. SIRP overexpression also suppressed transformation of NIH3T3 cells by a retrovirus carrying the v-fms oncogene (Kharitonenkov, A. et al. ( 1997) Nature 386: 181 -186). The discovery of new cytokine signal regulators and the polynucleotides encoding them satisfies a need in the art by providing new compositions which are useful in the diagnosis, prevention, and treatment of cell proliferative and immune disorders. SUMMARY OF THE INVENTION The invention features substantially purified polypeptides, cytokine signal regulators, referred to collectively as "CKSR" and individually as "CKSR- F * and '"CKSR-2." In one aspect, the invention provides a substantially purified polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 1 -2 and fragments thereof. The invention also includes a polypeptide comprising an amino acid sequence that differs by one or more conservative amino acid substitutions from an amino acid sequence selected from the group consisting of SEQ ID NO: 1 -2. The invention further provides a substantially purified variant having at least 90% amino acid identity to at least one of the amino acid sequences selected from the group consisting of SEQ ID NO: 1 -2 and fragments thereof. The invention also provides an isolated and purified polynucleotide encoding the polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 1 -2 and fragments thereof. The invention also includes an isolated and purified polynucleotide variant having at least 70% polynucleotide sequence identity to the polynucleotide encoding the polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 1 -2 and fragments thereof. Additionally, the invention provides an isolated and purified polynucleotide which hybridizes under stringent conditions to the polynucleotide encoding the polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 1 -2 and fragments thereof. The invention also provides an isolated and purified polynucleotide having a sequence which is complementary to the polynucleotide encoding the polypeptide comprising the amino acid sequence selected from the group consisting of SEQ ID NO: 1 -2 and fragments thereof. The invention also provides a method for detecting a polynucleotide in a sample containing nucleic acids, the method comprising the steps of: (a) hybridizing the complement of the polynucleotide sequence to at least one of the polynucleotides of the sample, thereby forming a hybridization complex; and (b) detecting the hybridization complex, wherein the presence of the hybridization complex correlates with the presence of a polynucleotide in the sample. In one aspect, the method further comprises amplifying the polynucleotide prior to hybridization. The invention also provides an isolated and purified polynucleotide comprising a polynucleotide sequence selected from the group consisting of SEQ ID NO:3-4 and fragments thereof. The invention further provides an isolated and purified polynucleotide variant having at least 70% polynucleotide sequence identity to the polynucleotide sequence selected from the group consisting of SEQ ID NO:3-4 and fragments thereof. The invention also provides an isolated and purified polynucleotide having a sequence which is complementary to the polynucleotide comprising a polynucleotide sequence selected from the group consisting of SEQ ID NO:3-4 and fragments thereof. The invention further provides an expression vector containing at least a fragment of the polynucleotide encoding the polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 1 -2. In another aspect, the expression vector is contained within a host cell. The invention also provides a method for producing a polypeptide. the method comprising the steps of: (a) culturing the host cell containing an expression vector containing a polynucleotide of the invention under conditions suitable for the expression of the polypeptide: and (b) recovering the polypeptide from the host cell culture. The inv ention also provides a pharmaceutical composition comprising a substantially purified polypeptide having the amino acid sequence selected from the group consisting of SEQ ID NO 1-2 and fragments thereof in conμmction with a suitable pharmaceutical carrier The invention further includes a purified antibody which binds to a polypeptide selected from the group consisting of SEQ ID NO 1 -2 and fragments thereof The invention also provides a purified agonist and a purified antagonist to the polypeptide The invention also provides a method for treating or preventing a disorder associated with decreased expression or activity of CKSR. the method comprising administering to a subject in need of such treatment an effective amount of a pharmaceutical composition comprising a substantially purified polypeptide having the ammo acid sequence selected from the group consisting of SEQ ID NO 1 -2 and fragments thereof, in conjunction with a suitable pharmaceutical carrier The invention also provides a method for treating or preventing a disorder associated with increased expression or activity of CKSR. the method comprising administering to a subject in need of such treatment an effective amount of an antagonist of a polypeptide having an amino acid sequence selected from the group consisting of SEQ ID NO 1 -2 and fragments thereof BRIEF DESCRIPTION OF THE FIGURES AND TABLE Figures 1 A. I B, I C, I D, I E, I F, and I G show the ammo acid sequence (SEQ ID NO 1 ) and nucleic acid sequence (SEQ ID NO 3) of CKSR- 1 The alignment was produced using MACDNASIS PRO software (Hitachi Software Engineering, South San Francisco CA) Figures 2A, 2B, and 2C show the amino acid sequence (SEQ ID NO 2) and nucleic acid sequence (SEQ ID NO 4) of CKSR-2 The alignment was produced using MACDNASIS PRO software (Hitachi Software Engineering) Figures 3 A, 3B, and 3C show the amino acid sequence alignment between CKSRJ (Incyte Clone ID 2280326, SEQ ID NO 1 ) and human e3B l (GI 2245671 , SEQ ID NO 5), produced using the multisequence alignment program of LASERGENE software (DNASTAR. Madison Wl) Figures 4A and 4B show the amino acid sequence alignment between CKSR-2 (Incyte Clone ID 2462908; SEQ ID NO 2) and human SIRP-β l (GI 2052058. SEQ ID NO 6). produced using the multisequence alignment program of LASERGENE software (DNASTAR) Table 1 shows the tools, programs, and algorithms used to analyze CKSR, along with applicable descriptions, references, and threshold parameters DESCRIPTION OF THE INVENTION Before the present proteins nucleotide sequences, and methods are described, it is understood that this invention is not limited to the particular machines, materials and methods described, as these may vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention which will be limited only by the appended claims. It must be noted that as used herein and in the appended claims, the singular forms "a, " " "an, " and "the" include plural reference unless the context clearly dictates otherwise. Thus, for example, a reference to "a host cell" includes a plurality of such host cells, and a reference to "an antibody" is a reference to one or more antibodies and equivalents thereof known to those skilled in the art. and so forth. Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which this invention belongs- Although any machines, materials, and methods similar or equivalent to those described herein can be used to practice or test the present invention, the preferred machines, materials and methods are now described. All publications mentioned herein are cited for the purpose of describing and disclosing the cell lines, protocols, reagents and vectors which are reported in the publications and which might be used in connection with the invention. Nothing herein is to be construed as an admission that the invention is not entitled to antedate such disclosure by virtue of prior invention. DEFINITIONS "CKSR" refers to the amino acid sequences of substantially purified CKSR obtained from any species, particularly a mammalian species, including bovine, ovine, porcine, murine, equine, and human, and from any source, whether natural, synthetic, semi-synthetic, or recombinant. The term "agonist" refers to a molecule which intensifies or mimics the biological activity of CKSR. Agonists may include proteins, nucleic acids, carbohydrates, small molecules, or any other compound or composition which modulates the activity of CKSR either by directly interacting with CKSR or by acting on components of the biological pathway in which CKSR participates. An "allelic variant" is an alternative form of the gene encoding CKSR. Allelic variants may result from at least one mutation in the nucleic acid sequence and may result in altered mRNAs or in polypeptides whose structure or function may or may not be altered. A gene may have none, one, or many allelic variants of its naturally occurring form. Common mutational changes which give rise to allelic variants are generally ascribed to natural deletions, additions, or substitutions of nucleotides. Each of these types of changes may occur alone, or in combination with the others, one or more times in a given sequence. "Altered " nucleic acid sequences encoding CKSR include those sequences with deletions, insertions, or substitutions of different nucleotides. resulting in a polypeptide the same as CKSR or a polypeptide with at least one functional characteristic of CKSR. Included within this definition are polymorphisms which may or may not be readily detectable using a particular oligonucleotide probe of the polynucleotide encoding CKSR. and improper or unexpected hybridization to allelic variants, with a locus other than the normal chromosomal locus for the polynucleotide sequence encoding CKSR. The encoded protein may also be "altered," and may contain deletions, insertions, or substitutions of amino acid residues which produce a silent change and result in a functionally equivalent CKSR. Deliberate amino acid substitutions may be made on the basis of similarity in polarity, charge, solubility, hydrophobicity, hydrophilicity, and/or the amphipathic nature of the residues, as long as the biological or immunological activity of CKSR is retained. For example, negatively charged amino acids may include aspartic acid and glutamic acid, and positively charged amino acids may include lysine and arginine. Amino acids with uncharged polar side chains having similar hydrophilicity values may include: asparagine and glutamine; and serine and threonine. Amino acids with uncharged side chains having similar hydrophilicity values may include: leucine. isoleucine. and valine; glycine and alanine; and phenylalanine and tyrosine. The terms "amino acid " and "amino acid sequence " refer to an oligopeptide, peptide, polypeptide. or protein sequence, or a fragment of any of these, and to naturally occurring or synthetic molecules. Where "amino acid sequence" is recited to refer to an amino acid sequence of a naturally occurring protein molecule, "amino acid sequence " and like terms are not meant to limit the amino acid sequence to the complete native amino acid sequence associated with the recited protein molecule. "Amplification " relates to the production of additional copies of a nucleic acid sequence. Amplification is generally carried out using polymerase chain reaction (PCR) technologies well known in the art. The term "antagonist " refers to a molecule which inhibits or attenuates the biological activity of CKSR. Antagonists may include proteins such as antibodies, nucleic acids, carbohydrates, small molecules, or any other compound or composition which modulates the activity of CKSR either by directly interacting with CKSR or by acting on components of the biological pathway in which CKSR participates. The term "antibody" refers to intact immunoglobulin molecules as well as to fragments thereof, such as Fab, F(abJ 2 . and Fv fragments, which are capable of binding an epitopic determinant. Antibodies that bind CKSR polypeptides can be prepared using intact polypeptides or using fragments containing small peptides of interest as the immunizing antigen. The polypeptide or oligopeptide used to immunize an animal (e.g., a mouse, a rat, or a rabbit) can be derived from the translation of RNA, or synthesized chemically, and can be conjugated to a carrier protein if desired. Commonly used carriers that are chemically coupled to peptides include bovine serum albumin, thyroglobulin. and keyhole limpet hemocyanin (KLH). The coupled peptide is then used to immunize the animal. The term "antigenic determinant" refers to that region of a molecule (i.e.. an epitope) that makes contact with a particular antibody. When a protein or a fragment of a protein is used to immunize a host animal, numerous regions of the protein may induce the production of antibodies which bind specifically to antigenic determinants (particular regions or three-dimensional structures on the protein). An antigenic determinant may compete with the intact antigen (i.e.. the immunogen used to elicit the immune response) for binding to an antibody. The term "antisense " refers to any composition containing a nucleic acid sequence which is complementary to the "sense " strand of a specific nucleic acid sequence. Antisense molecules may be produced by any method including synthesis or transcription. Once introduced into a cell, the complementary nucleotides combine with natural sequences produced by the cell to form duplexes and to block either transcription or translation. The designation "negative" or "minus " can refer to the antisense strand, and the designation "positive " or "plus " can refer to the sense strand. The term "biologically active " refers to a protein having structural, regulatory, or biochemical functions of a naturally occurring molecule. Likewise, "immunologically active" refers to the capability of the natural, recombinant, or synthetic CKSR, or of any oligopeptide thereof, to induce a specific immune response in appropriate animals or cells and to bind with specific antibodies. The terms "complementary" and "complementarity" refer to the natural binding of polynucleotides by base pairing. For example, the sequence "5' A-G-T 3'" bonds to the complementary sequence "3' T-C-A 5'." Complementarity between two single-stranded molecules may be "partial, " such that only some of the nucleic acids bind, or it may be "complete. " such that total complementarity exists between the single stranded molecules. The degree of complementarity between nucleic acid strands has significant effects on the efficiency and strength of the hybridization between the nucleic acid strands. This is of particular importance in amplification reactions, which depend upon binding between nucleic acid strands, and in the design and use of peptide nucleic acid (PNA) molecules. A "composition comprising a given polynucleotide sequence " and a "composition comprising a given amino acid sequence" refer broadly to any composition containing the given polynucleotide or amino acid sequence. The composition may comprise a dry formulation or an aqueous solution. Compositions comprising polynucleotide sequences encoding CKSR or fragments of CKSR may be employed as hybridization probes. The probes may be stored in freeze-dried form and may be associated with a stabilizing agent such as a carbohydrate. In hybridizations, the probe may be deployed in an aqueous solution containing salts (e.g., NaCl), detergents (e.g.. sodium dodecyl sulfate; SDS). and other components (e.g.. Denhardt's solution, dry milk, salmon sperm DNA. etc.). "Consensus sequence " refers to a nucleic acid sequence which has been resequenced to resolve uncalled bases, extended using the XL-PCR kit (Perkin-Elmer. Norwalk CT) in the 5' and/or the 3' direction- and resequenced. or which has been assembled from the overlapping sequences of one or more Incyte Clones and. in some cases, one or more public domain ESTs. using a computer program for fragment assembly, such as the GELVIEW fragment assembly system (GCG, Madison Wl). Some sequences have been both extended and assembled to produce the consensus sequence. "Conservative amino acid substitutions " are those substitutions that, when made, least interfere with the properties of the original protein, i.e.. the structure and especially the function of the protein is conserved and not significantly changed by such substitutions. The table below shows amino acids w hich may be substituted for an original amino acid in a protein and which are regarded as conservative amino acid substitutions. Original Residue Conservative Substitution Ala Gly, Ser Arg His, Lys Asn Asp, Gin. His Asp Asn, Glu Cys Ala, Ser Gin Asn, Glu. His Glu Asp, Gin. His Gly Ala Leu He, Val Lys Arg, Gin. Glu Met Leu. He Phe His. Met. Leu. Trp, Tyr Ser Cys. Thr Thr Ser, Val Trp Phe, Tyr Tyr His. Phe. Trp Val He. Leu. Thr Conservative amino acid substitutions generally maintain (a) the structure of the polypeptide backbone in the area of the substitution, for example, as a beta sheet or alpha helical conformation, (b) the charge or hydrophobicity of the molecule at the site of the substitution, and/or (c) the bulk of the side chain. A "deletion" refers to a change in the amino acid or nucleotide sequence that results in the absence of one or more amino acid residues or nucleotides. The term "derivative " refers to the chemical modification of a polypeptide sequence, or a polynucleotide sequence. Chemical modifications of a polynucleotide sequence can include, for example, replacement of hydrogen by an alkyl. acyl. hydroxyl. or amino group. A derivative polynucleotide encodes a polypeptide which retains at least one biological or immunological function of the natural molecule. A derivative polypeptide is one modified by glycosylation, pegylation. or any similar process that retains at least one biological or immunological function of the polypeptide from which it was derived. A "fragment" is a unique portion of CKSR or the polynucleotide encoding CKSR which is identical in sequence to but shorter in length than the parent sequence. A fragment may comprise up to the entire length of the defined sequence, minus one nucleotide/amino acid residue. For example, a fragment may comprise from 5 to 1000 contiguous nucleotides or amino acid residues. A fragment used as a probe, primer, antigen, therapeutic molecule, or for other purposes, may be at least 5, 10, 15, 20, 25. 30, 40. 50, 60, 75, 100, 150. 250 or at least 500 contiguous nucleotides or amino acid residues in length. Fragments may be preferentially selected from certain regions of a molecule. For example, a polypeptide fragment may comprise a certain length of contiguous amino acids selected from the first 250 or 500 amino acids (or first 25% or 50% of a polypeptide) as shown in a certain defined sequence. Clearly these lengths are exemplary, and any length that is supported by the specification, including the Sequence Listing, tables, and figures, may be encompassed by the present embodiments. A fragment of SEQ ID NO:3-4 comprises a region of unique polynucleotide sequence that specifically identifies SEQ ID NO:3-4, for example, as distinct from any other sequence in the same genome. A fragment of SEQ ID NO:3-4 is useful, for example, in hybridization and amplification technologies and in analogous methods that distinguish SEQ ID NO:3-4 from related polynucleotide sequences. The precise length of a fragment of SEQ ID NOJ-4 and the region of SEQ ID NOJ-4 to which the fragment corresponds are routinely determinable by one of ordinary skill in the art based on the intended purpose for the fragment. A fragment of SEQ ID NO: 1-2 is encoded by a fragment of SEQ ID NO:3-4. A fragment of SEQ ID NO: 1-2 comprises a region of unique amino acid sequence that specifically identifies SEQ ID NO: 1 -2. For example, a fragment of SEQ ID NO: 1 -2 is useful as an immunogenic peptide for the development of antibodies that specifically recognize SEQ ID NO: 1 -2. The precise length of a fragment of SEQ ID NO: 1-2 and the region of SEQ ID NO: 1 -2 to which the fragment corresponds are routinely determinable by one of ordinary skill in the art based on the intended purpose for the fragment. The term "similarity" refers to a degree of complementarity. There may be partial similarity or complete similarity. The word "identity" may substitute for the word "similarity. " A partially complementary sequence that at least partially inhibits an identical sequence from hybridizing to a target nucleic acid is referred to as ""substantially similar. " The inhibition of hybridization of the completely complementary sequence to the target sequence may be examined using a hybridization assay (Southern or northern blot, solution hybridization, and the like) under conditions of reduced stringency. A substantially similar sequence or hybridization probe will compete for and inhibit the binding of a completely similar (identical) sequence to the target sequence under conditions of reduced stringency. This is not to say that conditions of reduced stringency are such that non-specific binding is permitted, as reduced stringency conditions require that the binding of two sequences to one another be a specific (i.e., a selective) interaction. The absence of non-specific binding may be tested by the use of a second target sequence which lacks even a partial degree of complementarity (e.g., less than about 30% similarity or identity). In the absence of non-specific binding, the substantially similar sequence or probe will not hybridize to the second non-complementary target sequence. The phrases "percent identity " and '"% identity. " as applied to polynucleotide sequences, refer to the percentage of residue matches between at least two polynucleotide sequences aligned using a standardized algorithm. Such an algorithm may insert, in a standardized and reproducible way, gaps in the sequences being compared in order to optimize alignment between two sequences, and therefore achieve a more meaningful comparison of the two sequences. Percent identity between polynucleotide sequences may be determined using the default parameters of the CLUSTAL V algorithm as incorporated into the MEGALIGN version 3.12e sequence alignment program. This program is part of the LASERGENE software package, a suite of molecular biological analysis programs (DNASTAR. Madison Wl). CLUSTAL V is described in Higgins. D.G. and P.M. Sharp ( 1989) CABIOS 5: 151 - 153 and in Higgins. D.G. et al. ( 1992) CABIOS 8: 189- 191. For pairwise alignments of polynucleotide sequences, the default parameters are set as follows: Ktuple=2, gap penalty=5, window=4, and "diagonals saved"=4. The "'weighted" residue weight table is selected as the default. Percent identity is reported by CLUSTAL V as the "percent similarity " between aligned polynucleotide sequence pairs. Alternatively, a suite of commonly used and freely available sequence comparison algorithms is provided by the National Center for Biotechnology Information (NCBI) Basic Local Alignment Search Tool (BLAST) (Altschul. SJ. et al. ( 1990) j. Mol. Biol. 215:403-410). which is available from several sources, including the NCBI, Bethesda, MD, and on the Internet at http://www.ncbi. nlm.nih.gov/BLAST/. The BLAST software suite includes various sequence analysis programs including "blastn," that is used to align a known polynucleotide sequence with other polynucleotide sequences from a variety of databases. Also available is a tool called "BLAST 2 Sequences" that is used for direct pairwise comparison of two nucleotide sequences. "BLAST 2 Sequences " can be accessed and used interactively at http:/Avww. ncbi.nlin.nih.gov/gorf/bl2.html. The "BLAST 2 Sequences " tool can be used for both blastn and blastp (discussed below). BLAST programs are commonly used with gap and other parameters set to default settings. For example, to compare two nucleotide sequences, one may use blastn with the "BLAST 2 Sequences " tool Version 2.0.9 (May-07- 1999) set at default parameters. Such default parameters may be. for example: Matrix: BLOSUM62 Reward for match: J Penalty for mismatch: -2 Open Gap: 5 and Extension Gap: 2 penalties Gap x drop-off: 50 Expect: 10 Word Size: 11 Filter: on Percent identity may be measured over the length of an entire defined sequence, for example. as defined by a particular SEQ ID number, or may be measured over a shorter length, for example, over the length of a fragment taken from a larger, defined sequence, for instance, a fragment of at least 20, at least 30, at least 40, at least 50, at least 70. at ieast 100, or at least 200 contiguous nucleotides. Such lengths are exemplary only, and it is understood that any fragment length supported by the sequences shown herein, in the tables, figures, or Sequence Listing, may be used to describe a length over which percentage identity may be measured. Nucleic acid sequences that do not show a high degree of identity may nevertheless encode similar amino acid sequences due to the degeneracy of the genetic code. It is understood that changes in a nucleic acid sequence can be made using this degeneracy to produce multiple nucleic acid sequences that all encode substantially the same protein. The phrases "percent identity " and "% identity. " as applied to polypeptide sequences, refer to the percentage of residue matches between at least two polypeptide sequences aligned using a standardized algorithm. Methods of polypeptide sequence alignment are well-known. Some alignment methods take into account conservative amino acid substitutions. Such conservative substitutions, explained in more detail above, generally preserve the hydrophobicity and acidity at the site of substitution, thus preserving the structure (and therefore function ) of the polypeptide. Percent identity between polypeptide sequences may be determined using the default parameters of the CLUSTAL V algorithm as incorporated into the MEGALIGN version 3.12e sequence alignment program (described and referenced above). For pairwise alignments of polypeptide sequences using CLUSTAL V, the default parameters are set as follows: Ktuple= l , gap penalty=3. window=5, and "diagonals saved " =5. The PAM250 matrix is selected as the default residue weight table. As with polynucleotide alignments, the percent identity is reported by CLUSTAL V as the "percent similarity " between aligned polypeptide sequence pairs. Alternatively the NCBI BLAST software suite may be used. For example, for a pairwise comparison of two polypeptide sequences, one may use the ' " BLAST 2 Sequences " tool Version 2.0.9 (May-07- 1999) with blastp set at default parameters. Such default parameters may be, for example: Matrix: BLOSUM62 Open Gap: 11 and Extension Gap: 1 penalties Gap x drop-off: 50 Expect: 10 Word Size: 3 Filter: on Percent identity may be measured over the length of an entire defined polypeptide sequence, for example, as defined by a particular SEQ ID number, or may be measured over a shorter length, for example, over the length of a fragment taken from a larger, defined polypeptide sequence, for instance, a fragment of at least 15, at least 20. at least 30. at least 40, at least 50, at least 70 or at least 150 contiguous residues. Such lengths are exemplary only, and it is understood that any fragment length supported by the sequences shown herein, in the tables, figures or Sequence Listing, may be used to describe a length over which percentage identity may be measured. "Human artificial chromosomes" (HACs) are linear microchromosomes which may contain DNA sequences of about 6 kb to 10 Mb in size, and which contain all of the elements required for stable mitotic chromosome segregation and maintenance. The term "'humanized antibody " refers to antibody molecules in which the amino acid sequence in the non-antigen binding regions has been altered so that the antibody more closely resembles a human antibody, and still retains its original binding ability. "Hybridization" refers to the process by which a polynucleotide strand anneals with a complementary strand through base pairing under defined hybridization conditions. Specific hybridization is an indication that two nucleic acid sequences share a high degree of identity. Specific hybridization complexes form under permissive annealing conditions and remain hybridized after the "washing" step(s). The washing step(s) is particularly important in determining the stringency of the hybridization process, with more stringent conditions allowing less non-specific binding, i.e., binding between pairs of nucleic acid strands that are not perfectly matched. Permissive conditions for annealing of nucleic acid sequences are routinely determinable by one of ordinary skill in the art and may be consistent among hybridization experiments, whereas wash conditions may be varied among experiments to achieve the desired stringency, and therefore hybridization specificity. Permissive annealing conditions occur, for example, at 68°C in the presence of about 6 x SSC, about 1% (w/v) SDS. and about 100 μg/mi denatured salmon sperm DNA. Generally, stringency of hybridization is expressed, in part, with reference to the temperature under which the wash step is carried out. Generally, such wash temperatures are selected to be about 5°C to 20°C lower than the thermal melting point (T-J for the specific sequence at a defined ionic strength and pH. The T m is the temperature (under defined ionic strength and pH) at which 50% of the target sequence hybridizes to a perfectly matched probe. An equation for calculating T m and conditions for nucleic acid hybridization are well known and can be found in Sambrook et al., 1989, Molecular Cloning: A Laboratorv Manual. 2 nd ed.. vol. 1 -3. Cold Spring Harbor Press, Plainview NY; specifically see volume 2, chapter 9. High stringency conditions for hybridization between polynucleotides of the present invention include wash conditions of 68°C in the presence of about 0.2 x SSC and about 0.1 % SDS. for 1 hour. Alternatively, temperatures of about 65°C, 60°C, 55°C. or 42°C may be used. SSC concentration may be varied from about 0. 1 to 2 x SSC. with SDS being present at about 0.1 %. Typically, blocking reagents are used to block non-specific hybridization. Such blocking reagents include, for instance, denatured salmon sperm DNA at about 100-200 μg/ml. Organic solvent, such as formamide at a concentration of about 35-50% v/v, may also be used under particular circumstances, such as for RNA:DNA hybridizations. Useful variations on these wash conditions will be readily apparent to those of ordinary skill in the art. Hybridization, particularly under high stringency conditions, may be suggestive of evolutionary similarity between the nucleotides. Such similarity is strongly indicative of a similar role for the nucleotides and their encoded polypeptides. The term "hybridization complex " refers to a complex formed between two nucleic acid sequences by virtue of the formation of hydrogen bonds between complementary bases. A hybridization complex may be formed in solution (e.g., C„t or R 0 t analysis) or formed between one nucleic acid sequence present in solution and another nucleic acid sequence immobilized on a solid support (e.g., paper, membranes, filters, chips, pins or glass slides, or any other appropriate substrate to which cells or their nucleic acids have been fixed). The words "insertion" and "addition" refer to changes in an amino acid or nucleotide sequence resulting in the addition of one or more amino acid residues or nucleotides. respectively. "Immune response " can refer to conditions associated with inflammation, trauma, immune disorders, or infectious or genetic disease, etc. These conditions can be characterized by expression of various factors, e.g., cytokines, chemokines, and other signaling molecules, which may affect cellular and svstemic defense svstems. The term "microarray " refers to an arrangement of distinct polynucleotides on a substrate. The terms "element " and "array element " in a microarray context, refer to hybridizable polynucleotides arranged on the surface of a substrate. The term '"modulate " refers to a change in the activity of CKSR. For example, modulation may cause an increase or a decrease in protein activity, binding characteristics, or any other biological, functional, or immunological properties of CKSR. The phrases "nucleic acid " and "nucleic acid sequence " refer to a nucleotide. oligonucleotide. polynucleotide. or any fragment thereof. These phrases also refer to DNA or RNA of genomic or synthetic origin which may be single-stranded or double-stranded and may represent the sense or the antisense strand, to peptide nucleic acid (PNA), or to any DNA-like or RNA-like material. "Operably linked" refers to the situation in which a first nucleic acid sequence is placed in a functional relationship with the second nucleic acid sequence. For instance, a promoter is operably linked to a coding sequence if the promoter affects the transcription or expression of the coding sequence. Generally, operably linked DNA sequences may be in close proximity or contiguous and. where necessary to join two protein coding regions, in the same reading frame. "Peptide nucleic acid" (PNA) refers to an antisense molecule or anti-gene agent which comprises an oligonucleotide of at least about 5 nucleotides in length linked to a peptide backbone of amino acid residues ending in lysine. The terminal lysine confers solubility to the composition. PNAs preferentially bind complementary single stranded DNA or RNA and stop transcript elongation, and may be pegylated to extend their lifespan in the cell. "Probe" refers to nucleic acid sequences encoding CKSR, their complements, or fragments thereof, which are used to detect identical, allelic or related nucleic acid sequences. Probes are isolated oligonucleotides or polynucleotides attached to a detectable label or reporter molecule. Typical labels include radioactive isotopes, ligands. chemiluminescent agents, and enzymes. "'Primers" are short nucleic acids, usually DNA oligonucleotides, which may be annealed to a target polynucleotide by complementary base-pairing. The primer may then be extended along the target DNA strand by a DNA polymerase enzyme. Primer pairs can be used for amplification (and identification) of a nucleic acid sequence, e.g., by the polymerase chain reaction (PCR). Probes and primers as used in the present invention typically comprise at least 15 contiguous nucleotides of a known sequence. In order to enhance specificity, longer probes and primers may also be employed, such as probes and primers that comprise at least 20. 25. 30, 40. 50. 60. 70, 80, 90, 100, or at least 150 consecutive nucleotides of the disclosed nucleic acid sequences. Probes and primers may be considerably longer than these examples, and it is understood that any length supported by the specification, including the tables, figures, and Sequence Listing, may be used. Methods for preparing and using probes and primers are described in the references, for example Sambrook et al., 1989. Molecular Cloning: A Laboratorv Manual. 2 nd ed.. vol. 1-3, Cold Spring Harbor Press. Plainview NY: Ausubel et al., 1987. Current Protocols in Molecular Biology, Greene Publ. Assoc. & Wiley-lntersciences, New York NY; Innis et al.. 1990. PCR Protocols. A Guide to Methods and Applications. Academic Press. San Diego CA. PCR primer pairs can be derived from a known sequence, for example, by using computer programs intended for that purpose such as Primer (Version 0.5. 1991. Whitehead Institute for Biomedical Research. Cambridge MA). Oligonucleotides for use as primers are selected using software known in the art for such purpose. For example. OLIGO 4.06 software is useful for the selection of PCR primer pairs of up to 100 nucleotides each, and for the analysis of oligonucleotides and larger polynucleotides of up to 5.000 nucleotides from an input polynucleotide sequence of up to 32 kilobases. Similar primer selection programs have incorporated additional features for expanded capabilities. For example, the PrimOU primer selection program (available to the public from the Genome Center at University of Texas South West Medical Center, Dallas TX) is capable of choosing specific primers from megabase sequences and is thus useful for designing primers on a genome-wide scope. The Primer3 primer selection program (available to the public from the Whitehead Institute/MIT Center for Genome Research, Cambridge MA) allows the user to input a "mispriming library, " in which sequences to avoid as primer binding sites are user-specified. Primer3 is useful, in particular, for the selection of oligonucleotides for microarrays. (The source code for the latter two primer selection programs may also be obtained from their respective sources and modified to meet the user ' s specific needs.) The PrimeGen program (available to the public from the UK Human Genome Mapping Project Resource Centre, Cambridge UK) designs primers based on multiple sequence alignments, thereby allowing selection of primers that hybridize to either the most conserved or least conserved regions of aligned nucleic acid sequences. Hence, this program is useful for identification of both unique and conserved oligonucleotides and polynucleotide fragments. The oligonucleotides and polynucleotide fragments identified by any of the above selection methods are useful in hybridization technologies, for example, as PCR or sequencing primers, microarray elements, or specific probes to identify fully or partially complementary polynucleotides in a sample of nucleic acids. Methods of oligonucleotide selection are not limited to those described above. A "recombinant nucleic acid" is a sequence that is not naturally occurring or has a sequence that is made by an artificial combination of two or more otherwise separated segments of sequence. This artificial combination is often accomplished by chemical synthesis or, more commonly, by the artificial manipulation of isolated segments of nucleic acids, e.g., by genetic engineering techniques such as those described in Sambrook, supra. The term recombinant includes nucleic acids that have been altered solely by addition, substitution, or deletion of a portion of the nucleic acid- Frequently, a recombinant nucleic acid may include a nucleic acid sequence operably linked to a promoter sequence. Such a recombinant nucleic acid may be part of a vector that is used, for example, to transform a cell. Alternatively, such recombinant nucleic acids may be part of a viral vector, e.g., based on a vaccinia virus, that could be use to vaccinate a mammai wherein the recombinant nucleic acid is expressed, inducing a protective immunological response in the mammal. The term "sample " is used in its broadest sense. A sample suspected of containing nucleic acids encoding CKSR. or fragments thereof, or CKSR itself, may comprise a bodily fluid; an extract from a cell, chromosome, organelle. or membrane isolated from a cell a cell: genomic DNA, RNA, or cDNA, in solution or bound to a substrate; a tissue: a tissue print; etc. The terms "specific binding " and "specifically binding" refer to that interaction between a protein or peptide and an agonist, an antibody, an antagonist, a small molecule, or any natural or synthetic binding composition. The interaction is dependent upon the presence of a particular structure of the protein, e.g., the antigenic determinant or epitope, recognized by the binding molecule. For example, if an antibody is specific for epitope "A," the presence of a polypeptide containing the epitope A, or the presence of free unlabeled A, in a reaction containing free labeled A and the antibody will reduce the amount of labeled A that binds to the antibody. The term "substantially purified" refers to nucleic acid or amino acid sequences that are removed from their natural environment and are isolated or separated, and are at least about 60% free, preferably about 75% free, and most preferably about 90% free from other components with which they are naturally associated. A "substitution " refers to the replacement of one or more amino acids or nucleotides by different amino acids or nucleotides, respectively. "Substrate" refers to any suitable rigid or semi-rigid support including membranes, filters, chips, slides, wafers, fibers, magnetic or nonmagnetic beads, geis, tubing, plates, polymers, microparticles and capillaries. The substrate can have a variety of surface forms, such as wells, trenches, pins, channels and pores, to which polynucleotides or polypeptides are bound. "Transformation " describes a process by which exogenous DNA enters and changes a recipient cell. Transformation may occur under natural or artificial conditions according to various methods well known in the art. and may rely on any known method for the insertion of foreign nucleic acid sequences into a prokaryotic or eukaryotic host cell. The method for transformation is selected based on the type of host cell being transformed and may include, but is not limited to, viral infection, electroporation. heat shock, lipofection. and particle bombardment. The term "transformed" cells includes stably transformed cells in which the inserted DNA is capable of replication either as an autonomously replicating plasmid or as part of the host chromosome, as well as transiently transformed cells which express the inserted DNA or RNA for limited periods of time. A "variant " of a particular nucleic acid sequence is defined as a nucleic acid sequence having at least 40% sequence identity to the particular nucleic acid sequence over a certain length of one of the nucleic acid sequences using blastn with the "BLAST 2 Sequences " tool Version 2.0.9 (May-07- 1999) set at default parameters. Such a pair of nucleic acids may show, for example, at least 50%. at least 60%. at least 70%, at least 80%. at least 85%. at least 90%. at least 95% or at least 98% or greater sequence identity over a certain defined length. A variant may be described as, for example, an "allelic" (as defined above), "splice," "species," or " " polymorphic" variant. A splice variant may have significant identity to a reference molecule, but will generally have a greater or lesser number of polynucleotides due to alternate splicing of exons during mRNA processing. The corresponding polypeptide may possess additional functional domains or lack domains that are present in the reference molecule. Species variants are polynucleotide sequences that vary from one species to another. The resulting polypeptides generally will have significant amino acid identity relative to each other. A polymorphic variant is a variation in the polynucleotide sequence of a particular gene between individuals of a given species. Polymorphic variants also may encompass "single nucleotide polymorphisms " (SNPs) in which the polynucleotide sequence varies by one nucleotide base. The presence of SNPs may be indicative of, for example, a certain population, a disease state, or a propensity for a disease state. A "variant" of a particular polypeptide sequence is defined as a polypeptide sequence having at least 40% sequence identity to the particular polypeptide sequence over a certain length of one of the polypeptide sequences using blastp with the "BLAST 2 Sequences" tool Version 2.0.9 (May-07- 1999) set at default parameters. Such a pair of polypeptides may show, for example, at least 50%, at least 60%, at least 10%, at least 80%, at least 90%, at least 95%, or at least 98% or greater sequence identity over a certain defined length of one of the polypeptides. THE INVENTION The invention is based on the discovery of new human cytokine signal regulators (CKSR), the polynucleotides encoding CKSR, and the use of these compositions for the diagnosis, treatment, or prevention of cell proliferative and immune disorders. Nucleic acids encoding the CKSR-1 of the present invention were identified in Incyte Clone 2280326 from the prostate cDNA library (PROSNON01 ) using a computer search for nucleotide and/or amino acid sequence alignments. A consensus sequence. SEQ ID NOJ, was derived from the following overlapping and/or extended nucleic acid sequences: incyte Clones 3865321 H I (BRAITUT07). 2454448F6 (ENDANOT01 ). 2280326H 1 (PROSNON01 ). 3677077H 1 (PLACNOT07). 825309R1 (PROSNOT06), 1675605F6 (BLADNOT05), 3 187881 H1 (THYMNON04), 151301 1 T1 (PANCTUT01 ), and 2189346T6 (PROSNOT26). In one embodiment, the invention encompasses a polypeptide comprising the amino acid sequence of SEQ ID NO: 1 , as shown in Figures 1 A- 1 G. CKSR is 476 amino acids in length and has one potential N-glycosylation site at residue N 132: one potential cAMP- and cGMP-dependent protein kinase phosphorylation site at residue S452; nine potential casein kinase II phosphorylation sites at residues S51. S58, T95, T124. S349. T368. S418. S431 , and S438; and nine potential protein kinase C phosphorylation sites at residues T73, Tl 24, Tl 51 , Tl 82, S277. S280. T335, S431. and T448. PFAM, BLOCKS, and PRINTS identify a potential Src homology 3 (SH3) domain from residue E421 through S475. As shown in Figures 3 A. 3B, and 3C, CKSR- 1 has chemical and structural similarity with human e3B l (GI 2245671 : SEQ ID NO:5). In particular. CKSR-1 and e3Bl share 32% identity. A fragment of SEQ ID NOJ from about nucleotide 447 to about nucleotide 509 is useful in hybridization or amplification technologies to identify SEQ ID NOJ and to distinguish between SEQ ID NOJ and a related sequence. Northern analysis shows the expression of CKSR- 1 in various libraries, at least 50% of which are associated with cancer and at least 38% of which are associated with the immune response. Of particular note is the expression of CKSR-1 in cardiovascular, gastrointestinal, reproductive, and hematopoietic/immune tissues. Nucleic acids encoding the CKSR-2 of the present invention were identified in Incyte Clone 2462908 from the thyroid tissue cDNA library (THYRNOT08) using a computer search for nucleotide and/or amino acid sequence alignments. A consensus sequence, SEQ ID NOJ, was derived from the following overlapping and/or extended nucleic acid sequences: Incyte Clones 2462908X302D1 and 2462908H l (THYRNOT08). and 1735760X301 B2 (COLNNOT22). In one embodiment, the invention encompasses a polypeptide comprising the amino acid sequence of SEQ ID NO:2, as shown in Figures 2A. 2B, and 2C. CKSR-2 is 170 amino acids in length and has one potential cAMP- and cGMP-dependent protein kinase phosphorylation site at residues S I 26; two potential casein kinase II phosphorylation sites at residues T90 and Tl 10; and two potential protein kinase C phosphorylation sites at residues T95 and S I 03. SPScan and HMM-based analysis identify a potential signal peptide from residue M 1 through G28. and PFAM identifies a potential immunoglobulin signature from residue G46 through K121. As shown in Figures 4A and 4B, CKSR-2 has chemical and structural similarity with human SIRP-βl (GI 2052058; SEQ ID NO:6). In particular, CKSR-2 and SIRP-βl share 69% identity. A fragment of SEQ ID NOJ from about nucleotide 438 to about nucleotide 482 is useful in hybridization or amplification technologies to identify SEQ ID NOJ and to distinguish between SEQ ID NOJ and a related sequence. Northern analysis shows the expression of CKSR-2 in various libraries, at least 67% of which are associated with cancer and at least 33% of which are associated with the immune response. Of particular note is the expression of CKSR-2 in cardiovascular, gastrointestinal, and endocrine tissues. The invention also encompasses CKSR variants. A preferred CKSR variant is one which has at least about 80%. or alternatively at least about 90%. or even at least about 95% amino acid sequence identity to the CKSR amino acid sequence, and which contains at least one functional or structural characteristic of CKSR. The invention also encompasses polynucleotides which encode CKSR. In a particular embodiment, the invention encompasses a polynucleotide sequence comprising a sequence selected from the group consisting of SEQ ID NO:3-4, which encodes CKSR. The invention also encompasses a variant of a polynucleotide sequence encoding CKSR. In particular, such a variant polynucleotide sequence will have at least about 70%. or alternatively at least about 85%>, or even at least about 95%> polynucleotide sequence identity to the polynucleotide sequence encoding CKSR. A particular aspect of the invention encompasses a variant of a polynucleotide sequence comprising a sequence selected from the group consisting of SEQ ID NO:3- 4 which has at least about 70%, or alternatively at least about 85%, or even at least about 95% polynucleotide sequence identity to a nucleic acid sequence selected from the group consisting of SEQ ID NO:3-4. Any one of the polynucleotide variants described above can encode an amino acid sequence which contains at least one functional or structural characteristic of CKSR. It will be appreciated by those skilled in the art that as a result of the degeneracy of the genetic code, a multitude of polynucleotide sequences encoding CKSR, some bearing minimal similarity to the polynucleotide sequences of any known and naturally occurring gene, may be produced. Thus, the invention contemplates each and every possible variation of polynucleotide sequence that could be made by selecting combinations based on possible codon choices. These combinations are made in accordance with the standard triplet genetic code as applied to the polynucleotide sequence of naturally occurring CKSR, and all such variations are to be considered as being specifically disclosed. Although nucleotide sequences which encode CKSR and its variants are generally capable of hybridizing to the nucleotide sequence of the naturally occurring CKSR under appropriately selected conditions of stringency, it may be advantageous to produce nucleotide sequences encoding CKSR or its derivatives possessing a substantially different codon usage, e.g., inclusion of non-naturally occurring codons. Codons may be selected to increase the rate at which expression of the peptide occurs in a particular prokaryotic or eukaryotic host in accordance with the frequency with which particular codons are utilized by the host. Other reasons for substantially altering the nucleotide sequence encoding CKSR and its derivatives without altering the encoded amino acid sequences include the production of RNA transcripts having more desirable properties, such as a greater half-life, than transcripts produced from the naturally occurring sequence. The invention also encompasses production of DNA sequences which encode CKSR and CKSR derivatives, or fragments thereof, entirely by synthetic chemistry. After production, the synthetic sequence may be inserted into any of the many available expression vectors and cell systems using reagents well known in the art. Moreover, synthetic chemistry may be used to introduce mutations into a sequence encoding CKSR or any fragment thereof. Also encompassed by the invention are polynucleotide sequences that are capable of hybridizing to the claimed polynucleotide sequences, and, in particular, to those shown in SEQ ID NO:3-4 and fragments thereof under various conditions of stringency. (See, e.g., Wahl, G.M. and S.L. Berger ( 1987) Methods Enzymol. 152:399-407; Kimmel, A.R. (1987) Methods Enzy ol. 152:507-51 1.) Hybridization conditions, including annealing and wash conditions, are described in "Definitions." Methods for DNA sequencing are well known in the art and may be used to practice any of the embodiments of the invention. The methods may employ such enzymes as the Klenow fragment of DNA polymerase I, SEQUENASE (US Biochemical. Cleveland OH), Taq polymerase (Perkin- Elmer), thermostable T7 polymerase (Amersham Pharmacia Biotech, Piscataway NJ), or combinations of polymerases and proofreading exonucleases such as those found in the ELONGASE amplification system (Life Technologies, Gaithersburg MD). Preferably, sequence preparation is automated with machines such as the MICROLAB 2200 liquid transfer system (Hamilton. Reno NV), PTC200 thermal cycler (MJ Research, Watertown MA) and ABI CATALYST 800 thermal cycler (Perkin-Elmer). Sequencing is then carried out using either the ABI 373 or 377 DNA sequencing system (Perkin-Elmer), the MEGABACE 1000 DNA sequencing system (Molecular Dynamics, Sunnyvale CA), or other systems known in the art. The resulting sequences are analyzed using a variety of algorithms which are well known in the art. (See, e.g., Ausubel, F.M. ( 1997) Short Protocols in Molecular Biology. John Wiley & Sons, New York NY. unit 1.1; Meyers, R.A. (1995) Molecular Biology and Biotechnology. Wiley VCH. New York NY, pp. 856-853.) The nucleic acid sequences encoding CKSR may be extended utilizing a partial nucleotide sequence and employing various PCR-based methods known in the art to detect upstream sequences, such as promoters and regulatory elements. For example, one method which may be employed, restriction-site PCR, uses universal and nested primers to amplify unknown sequence from genomic DNA within a cloning vector. (See. e.g., Sarkar. G. ( 1993) PCR Methods Applic. 2:318-322.) Another method, inverse PCR, uses primers that extend in divergent directions to amplify unknown sequence from a circularized template. The template is derived from restriction fragments comprising a known genomic locus and surrounding sequences. (See, e.g., Triglia. T. et al. ( 1988) Nucleic Acids Res. 16:8186.) A third method, capture PCR, involves PCR amplification of DNA fragments adjacent to known sequences in human and yeast artificial chromosome DNA. (See, e.g., Lagerstrom, M. et al. ( 1991 ) PCR Methods Applic. 1 : 1 1 1- 1 19.) In this method, multiple restriction enzyme digestions and ligations may be used to insert an engineered double-stranded sequence into a region of unknown sequence before performing PCR. Other methods which may be used to retrieve unknown sequences are known in the art. (See, e.g., Parker, J.D. et alJ 1991 ) Nucleic Acids Res. 19:3055-3060). Additionally, one may use PCR. nested primers, and PROMOTERFINDER libraries (Clontech, Palo Alto CA) to walk genomic DNA. This procedure avoids the need to screen libraries and is useful in finding intron/exon junctions. For all PCR-based methods, primers may be designed using commercially available software, such as OLIGO 4.06 Primer Analysis software (National Biosciences, Plymouth MN) or another appropriate program, to be about 22 to 30 nucleotides in length, to have a GC content of about 50% or more, and to anneal to the template at temperatures of about 68°C to 72°C. When screening for full-length cDNAs, it is preferable to use libraries that have been size-selected to include larger cDNAs. In addition, random-primed libraries, which often include sequences containing the 5' regions of genes, are preferable for situations in which an oligo d(T) library does not yield a full-length cDNA. Genomic libraries may be useful for extension of sequence into 5' non-transcribed regulatory regions. Capillary electrophoresis systems which are commercially available may be used to analyze the size or confirm the nucleotide sequence of sequencing or PCR products. In particular, capillary sequencing may employ flowable polymers for electrophoretic separation, four different nucleotide- specific, laser-stimulated fluorescent dyes, and a charge coupled device camera for detection of the emitted wavelengths. Output/light intensity may be converted to electrical signal using appropriate software (e.g., GENOTYPER and SEQUENCE NAVIGATOR, Perkin-Elmer), and the entire process from loading of samples to computer analysis and electronic data display may be computer controlled. Capillary electrophoresis is especially preferable for sequencing small DNA fragments which may be present in limited amounts in a particular sample. In another embodiment of the invention, polynucleotide sequences or fragments thereof which encode CKSR may be cloned in recombinant DNA molecules that direct expression of CKSR, or fragments or functional equivalents thereof, in appropriate host cells. Due to the inherent degeneracy of the genetic code, other DNA sequences which encode substantially the same or a functionally equivalent amino acid sequence may be produced and used to express CKSR. The nucleotide sequences of the present invention can be engineered using methods generally known in the art in order to alter CKSR-encoding sequences for a variety of purposes including, but not limited to. modification of the cloning, processing, and/or expression of the gene product. DNA shuffling by random fragmentation and PCR reassembly of gene fragments and synthetic oligonucleotides may be used to engineer the nucleotide sequences. For example, oligonucleotide- mediated site-directed mutagenesis may be used to introduce mutations that create new restriction sites, alter glycosylation patterns, change codon preference, produce splice variants, and so forth. In another embodiment, sequences encoding CKSR may be synthesized, in whole or in part, using chemical methods well known in the art. (See, e.g., Caruthers. M.H. et al. (1980) Nucleic Acids Symp. Ser. 7:215-223; and Horn, T. et al. (1980) Nucleic Acids Symp. Ser. 7:225-232.) Alternatively. CKSR itself or a fragment thereof may be synthesized using chemical methods. For example, peptide synthesis can be performed using various solid-phase techniques. (See, e.g., Roberge. J.Y. et al. (1995) Science 269:202-204.) Automated synthesis may be achieved using the ABI 431 A peptide synthesizer (Perkin-Elmer). Additionally, the amino acid sequence of CKSR, or any part thereof, may be altered during direct synthesis and/or combined with sequences from other proteins, or any part thereof, to produce a variant polypeptide. The peptide may be substantially purified by preparative high performance liquid chromatography. (See, e.g., Chiez, R.M. and F.Z. Regnier (1990) Methods Enzymol. 182:392-421.) The composition of the synthetic peptides may be confirmed by amino acid analysis or by sequencing. (See, e.g., Creighton, T. ( 1984) Proteins. Structures and Molecular Properties. WH Freeman, New York NY.) In order to express a biologically active CKSR, the nucleotide sequences encoding CKSR or derivatives thereof may be inserted into an appropriate expression vector, i.e., a vector which contains the necessary elements for transcriptional and translational control of the inserted coding sequence in a suitable host. These elements include regulatory sequences, such as enhancers, constitutive and inducible promoters, and 5' and 3' untranslated regions in the vector and in polynucleotide sequences encoding CKSR. Such elements may vary in their strength and specificity. Specific initiation signals may also be used to achieve more efficient translation of sequences encoding CKSR. Such signals include the ATG initiation codon and adjacent sequences, e.g. the Kozak sequence. In cases where sequences encoding CKSR and its initiation codon and upstream regulatory sequences are inserted into the appropriate expression vector, no additional transcriptional or translational control signals may be needed. However, in cases where only coding sequence, or a fragment thereof, is inserted, exogenous translational control signals including an in-frame ATG initiation codon should be ■ yy provided by the vector. Exogenous translational elements and initiation codons may be of various origins, both natural and synthetic. The efficiency of expression may be enhanced by the inclusion of enhancers appropriate for the particular host cell system used. (See, e.g., Scharf, D. et al. (1994) Results Probl. Cell Differ. 20: 125-162.) Methods which are well known to those skilled in the art may be used to construct expression vectors containing sequences encoding CKSR and appropriate transcriptional and translational control elements. These methods include in vitro recombinant DNA techniques, synthetic techniques, andjn vivo genetic recombination. (See, e.g., Sambrook, J. et al. ( 1989) Molecular Cloning, A Laboratorv Manual, Cold Spring Harbor Press, Plainview NY, ch. 4, 8, and 16- 17; Ausubel, F.M. et al. (1995) Current Protocols in Molecular Biology, John Wiley & Sons. New York NY, ch. 9, 13, and 16.) A variety of expression vector/host systems may be utilized to contain and express sequences encoding CKSR. These include, but are not limited to. microorganisms such as bacteria transformed with recombinant bacteriophage. plasmid. or cosmid DNA expression vectors; yeast transformed with yeast expression vectors; insect cell systems infected with viral expression vectors (e.g., baculovirus); plant cell systems transformed with viral expression vectors (e.g., cauliflower mosaic virus, CaMV, or tobacco mosaic virus, TMV) or with bacterial expression vectors (e.g., Ti or pBR322 plasmids); or animal cell systems. The invention is not limited by the host cell employed. In bacterial systems, a number of cloning and expression vectors may be selected depending upon the use intended for polynucleotide sequences encoding CKSR. For example, routine cloning, subcloning, and propagation of polynucleotide sequences encoding CKSR can be achieved using a multifunctional E. coli vector such as PBLUESCRIPT (Stratagene, La Jolla CA) or PSPORT1 plasmid (Life Technologies). Ligation of sequences encoding CKSR into the vector's multiple cloning site disrupts the lacZ gene, allowing a colorimetric screening procedure for identification of transformed bacteria containing recombinant molecules. In addition, these vectors may be useful for in vitro transcription, dideoxy sequencing, single strand rescue with helper phage, and creation of nested deletions in the cloned sequence. (See, e.g., Van Heeke, G. and S.M. Schuster (1989) J. Biol. Chem. 264:5503-5509.) When large quantities of CKSR are needed, e.g. for the production of antibodies, vectors which direct high level expression of CKSR may be used. For example, vectors containing the strong, inducible T5 or T7 bacteriophage promoter may be used. Yeast expression systems may be used for production of CKSR. A number of vectors containing constitutive or inducible promoters, such as alpha factor, alcohol oxidase, and PGH promoters, may be used in the yeast Saccharomvces cerevisiae or Pichia pastoris. In addition, such vectors direct either the secretion or intracellular retention of expressed proteins and enable integration of foreign sequences into the host genome for stable propagation. (See, e.g., Ausubel, 1995. supra: Bitter. G.A. et al. ( 1987) Methods Enzymol. 153:516-544: and Scorer. CA. et al. (1994) Bio/Technology 12: 181- 184.) Plant systems may also be used for expression of CKSR. Transcription of sequences encoding CKSR may be driven viral promoters, e.g.. the 35S and 19S promoters of CaMV used alone or in combination with the omega leader sequence from TMV (Takamatsu, N. (1987) EMBO J. 6:307-31 1 ). Alternatively, plant promoters such as the small subunit of RUBISCO or heat shock promoters may be used. (See, e.g., Coruzzi. G. et al. ( 1984) EMBO J. 3: 1671-1680; Broglie, R. et al. ( 1984) Science 224:838-843; and Winter. J. et al. (1991 ) Results Probl. Cell Differ. 17:85-105.) These constructs can be introduced into plant cells by direct DNA transformation or pathogen-mediated transfection. (See, e.g.. The McGraw Hill Yearbook of Science and Technology (1992) McGraw Hill, New York NY, pp. 191-196.) In mammalian cells, a number of viral-based expression systems may be utilized. In cases where an adenovirus is used as an expression vector, sequences encoding CKSR may be ligated into an adenovirus transcription/translation complex consisting of the late promoter and tripartite leader sequence. Insertion in a non-essential El or E3 region of the viral genome may be used to obtain infective virus which expresses CKSR in host cells. (See, e.g., Logan, J. and T. Shenk ( 1984) Proc. Natl. Acad. Sci. USA 81 :3655-3659.) In addition, transcription enhancers, such as the Rous sarcoma virus (RSV) enhancer, may be used to increase expression in mammalian host cells. SV40 or EBV- based vectors may also be used for high-level protein expression. Human artificial chromosomes (HACs) may also be employed to deliver larger fragments of DNA than can be contained in and expressed from a plasmid. HACs of about 6 kb to 10 Mb are constructed and delivered via conventional delivery methods (liposomes, polycationic amino polymers, or vesicles) for therapeutic purposes. (See, e.g., Harrington, J.J. et al. (1997) Nat. Genet. 15:345-355.) For long term production of recombinant proteins in mammalian systems, stable expression of CKSR in cell lines is preferred. For example, sequences encoding CKSR can be transformed into cell lines using expression vectors which may contain viral origins of replication and/or endogenous expression elements and a selectable marker gene on the same or on a separate vector. Following the introduction of the vector, cells may be allowed to grow for about 1 to 2 days in enriched media before being switched to selective media. The purpose of the selectable marker is to confer resistance to a selective agent, and its presence allows growth and recovery of cells which successfully express the introduced sequences. Resistant clones of stably transformed cells may be propagated using tissue culture techniques appropriate to the cell type. Any number of selection systems may be used to recover transformed cell lines. These include, but are not limited to. the herpes simplex virus thymidine kinase and adenine phosphoribosyltransferase genes, for use in tk and apr cells, respectively. (See. e.g., Wigler, M. et al. (1977) Cell 1 1 :223-232; Lowy, I. et aIJ 1980) Cell 22:817-823.) Also, antimetabolite. antibiotic, or herbicide resistance can be used as the basis for selection. For example, dhfr confers resistance to methotrexate: neo confers resistance to the aminoglycosides neomycin and G-418; and als and /rat confer resistance to chlorsulfuron and phosphinotricin acetyltransferase, respectively. (See, e.g., Wigler, M. et al. (1980) Proc. Natl. Acad. Sci. USA 77:3567-3570; Colbere-Garapin, F. et al. (1981) j. Mol. Biol. 150: 1-14.) Additional selectable genes have been described, e.g.. trpB and hisD, which alter cellular requirements for metabolites. (See, e.g., Hartman, S.C. and R.C. Mulligan ( 1988) Proc. Natl. Acad. Sci. USA 85:8047-8051.) Visible markers, e.g.. anthocyanins, green fluorescent proteins (GFP; Clontech), β glucuronidase and its substrate β-glucuronide, or luciferase and its substrate luciferin may be used. These markers can be used not only to identify transformants, but also to quantify the amount of transient or stable protein expression attributable to a specific vector system. (See, e.g., Rhodes. C.AJ 1995) Methods Mol. Biol. 55: 121-131.) Although the presence/absence of marker gene expression suggests that the gene of interest is also present, the presence and expression of the gene may need to be confirmed. For example, if the sequence encoding CKSR is inserted within a marker gene sequence, transformed cells containing sequences encoding CKSR can be identified by the absence of marker gene function. Alternatively, a marker gene can be placed in tandem with a sequence encoding CKSR under the control of a single promoter. Expression of the marker gene in response to induction or selection usually indicates expression of the tandem gene as well. In general, host cells that contain the nucleic acid sequence encoding CKSR and that express CKSR may be identified by a variety of procedures known to those of skill in the art. These procedures include, but are not limited to, DNA-DNA or DNA-RNA hybridizations, PCR amplification, and protein bioassay or immunoassay techniques which include membrane, solution, or chip based technologies for the detection and/or quantification of nucleic acid or protein sequences. Immunological methods for detecting and measuring the expression of CKSR using either specific polyclonal or monoclonal antibodies are known in the art. Examples of such techniques include enzyme-linked immunosorbent assays (ELISAs), radioimmunoassays (RIAs), and fluorescence activated cell sorting (FACS). A two-site, monoclonal-based immunoassay utilizing monoclonal antibodies reactive to two non-interfering epitopes on CKSR is preferred, but a competitive binding assay may be employed. These and other assays are well known in the art. (See, e.g., Hampton, R. et al. (1990) Serological Methods, a Laboratorv Manual. APS Press, St. Paul MN, Sect. IV; Coligan, J.E. et al. ( 1997) Current Protocols in Immunology, Greene Pub. Associates and Wiley-Interscience. New York NY: and Pound, J.D. ( 1998) Immunochemical Protocols. Humana Press, Totowa NJ.) A wide variety of labels and conjugation techniques are known by those skilled in the art and may be used in various nucleic acid and amino acid assays. Means for producing labeled hybridization or PCR probes for detecting sequences related to polynucleotides encoding CKSR include oligolabeling, nick translation, end-labeling, or PCR amplification using a labeled nucleotide. Alternatively, the sequences encoding CKSR, or any fragments thereof, may be cloned into a vector for the production of an mRNA probe. Such vectors are known in the art, are commercially available, and may be used to synthesize RNA probes in vitro by addition of an appropriate RNA polymerase such as T7, T3, or SP6 and labeled nucleotides. These procedures may be conducted using a variety of commercially available kits, such as those provided by Amersham Pharmacia Biotech, Promega (Madison Wl). and US Biochemical. Suitable reporter molecules or labels which may be used for ease of detection include radionuclides. enzymes, fluorescent, chemiluminescent. or chromogenic agents, as well as substrates, cofactors, inhibitors, magnetic particles, and the like. Host cells transformed with nucleotide sequences encoding CKSR may be cultured under conditions suitable for the expression and recovery of the protein from cell culture. The protein produced by a transformed cell may be secreted or retained intracellularly depending on the sequence and/or the vector used. As will be understood by those of skill in the art, expression vectors containing polynucleotides which encode CKSR may be designed to contain signal sequences which direct secretion of CKSR through a prokaryotic or eukaryotic cell membrane. In addition, a host cell strain may be chosen for its ability to modulate expression of the inserted sequences or to process the expressed protein in the desired fashion. Such modifications of the polypeptide include, but are not limited to, acetylation, carboxylation, glycosylation, phosphorylation, lipidation. and acylation. Post-translational processing which cleaves a "prepro" or "pro" form of the protein may also be used to specify protein targeting, folding, and/or activity. Different host cells which have specific cellular machinery and characteristic mechanisms for post-translational activities (e.g., CHO, HeLa, MDCK, HEK293, and WI38) are available from the American Type Culture Collection (ATCC, Manassas VA) and may be chosen to ensure the correct modification and processing of the foreign protein. In another embodiment of the invention, natural, modified, or recombinant nucleic acid sequences encoding CKSR may be ligated to a heterologous sequence resulting in translation of a fusion protein in any of the aforementioned host systems. For example, a chimeric CKSR protein containing a heterologous moiety that can be recognized by a commercially available antibody may facilitate the screening of peptide libraries for inhibitors of CKSR activity. Heterologous protein and peptide moieties may also facilitate purification of fusion proteins using commercially available affinity matrices. Such moieties include, but are not limited to, glutathione S-transferase (GST), maltose binding protein (MBP), thioredoxin (Trx). calmodulin binding peptide (CBP), 6-His, FLAG, c-myc, and hemagglutinin (HA). GST. MBP, Trx, CBP, and 6-His enable purification of their cognate fusion proteins on immobilized glutathione, maltose, phenylarsine oxide, calmodulin. and metal- chelate resins, respectively. FLAG, c-myc, and hemagglutinin (HA) enable immunoaffinity purification of fusion proteins using commercially available monoclonal and polyclonal antibodies that specifically recognize these epitope tags. A fusion protein may also be engineered to contain a proteolytic cleavage site located between the CKSR encoding sequence and the heterologous protein sequence, so that CKSR may be cleaved away from the heterologous moiety following purification. Methods for fusion protein expression and purification are discussed in Ausubel ( 1995, supra, ch. 10). A variety of commercially available kits may also be used to facilitate expression and purification of fusion proteins. In a further embodiment of the invention, synthesis of radiolabeled CKSR may be achieved jn vitro using the TNT rabbit reticulocyte lysate or wheat germ extract system (Promega). These systems couple transcription and translation of protein-coding sequences operably associated with the T7, T3, or SP6 promoters. Translation takes place in the presence of a radiolabeled amino acid precursor, for example, 35 S-methionine. Fragments of CKSR may be produced not only by recombinant means, but also by direct peptide synthesis using solid-phase techniques. (See, e.g.. Creighton, supra, pp. 55-60.) Protein synthesis may be performed by manual techniques or by automation. Automated synthesis may be achieved, for example, using the ABI 431 A peptide synthesizer (Perkin-Elmer). Various fragments of CKSR may be synthesized separately and then combined to produce the full length molecule. THERAPEUTICS Chemical and structural similarity, e.g., in the context of sequences and motifs, exists between regions of CKSR and cytokine signaling proteins. In addition, the expression of CKSR is closely associated with cardiovascular and gastrointestinal tissues, cancer, and the immune response. Therefore, CKSR appears to play a role in cell proliferative and immune disorders. In the treatment of disorders associated with increased CKSR expression or activity, it is desirable to decrease the expression or activity of CKSR. In the treatment of disorders associated with decreased CKSR expression or activity, it is desirable to increase the expression or activity of CKSR. Therefore, in one embodiment, CKSR or a fragment or derivative thereof may be administered to a subject to treat or prevent a disorder associated with decreased expression or activity of CKSR. Examples of such disorders include, but are not limited to. a cell proliferative disorder such as actinic keratosis, arteriosclerosis, atherosclerosis, bursitis, cirrhosis, hepatitis, mixed connective tissue disease (MCTD), myelofibrosis, paroxysmal nocturnal hemoglobinuria, polycythemia vera. psoriasis, primary thrombocythemia. and a cancer including adenocarcinoma, leukemia, lymphoma. melanoma, myeloma, sarcoma, teratocarcinoma, and, in particular, a cancer of the adrenal gland, bladder, bone, bone marrow, brain, breast, cervix, gall bladder, ganglia, gastrointestinal tract, heart, kidney, liver, lung, muscle, ovary, pancreas, parathyroid, penis, prostate, salivary glands, skin, spleen, testis, thymus. thyroid, and uterus; and an immune disorder such as acquired immunodeficiency syndrome (AIDS). Addison ' s disease, adult respiratory distress syndrome, allergies, ankylosing spondylitis, amyloidosis, anemia, asthma, atherosclerosis, autoimmune hemolytic anemia, autoimmune thyroiditis, autoimmune polyenodocrinopathy- candidiasis-ectodermai dystrophy (APECED), bronchitis, cholecystitis, contact dermatitis, Crohn's disease, atopic dermatitis, dermatomyositis, diabetes mellitus. emphysema, episodic lymphopenia with lymphocytotoxins, erythroblastosis fetalis, erythema nodosum, atrophic gastritis, glomerulonephritis, Goodpasture ' s syndrome, gout. Graves' disease, Hashimoto's thyroiditis, hypereosinophilia, irritable bowel syndrome, multiple sclerosis, myasthenia gravis, myocardial or pericardial inflammation, osteoarthritis, osteoporosis, pancreatitis, polymyositis, psoriasis, Reiter's syndrome, rheumatoid arthritis, scleroderma, Sjδgren ' s syndrome, systemic anaphylaxis, systemic lupus erythematosus, systemic sclerosis, thrombocytopenic purpura, ulcerative colitis, uveitis. Werner syndrome, complications of cancer, hemodialysis, and extracorporeal circulation, viral, bacterial, fungal, parasitic, protozoal, and helminthic infections, and trauma. In another embodiment, a vector capable of expressing CKSR or a fragment or derivative thereof may be administered to a subject to treat or prevent a disorder associated with decreased expression or activity of CKSR including, but not limited to, those described above. In a further embodiment, a pharmaceutical composition comprising a substantially purified CKSR in conjunction with a suitable pharmaceutical carrier may be administered to a subject to treat or prevent a disorder associated with decreased expression or activity of CKSR including, but not limited to, those provided above. In still another embodiment, an agonist which modulates the activity of CKSR may be administered to a subject to treat or prevent a disorder associated with decreased expression or activity of CKSR including, but not limited to, those listed above. In a further embodiment, an antagonist of CKSR may be administered to a subject to treat or prevent a disorder associated with increased expression or activity of CKSR. Examples of such disorders include, but are not limited to, those cell proliferative and immune disorders described above. In one aspect, an antibody which specifically binds CKSR may be used directly as an antagonist or indirectly as a targeting or delivery mechanism for bringing a pharmaceutical agent to cells or tissues which express CKSR. In an additional embodiment, a vector expressing the complement of the polynucleotide encoding CKSR may be administered to a subject to treat or prevent a disorder associated with increased expression or activity of CKSR including, but not limited to, those described above. In other embodiments, any of the proteins, antagonists, antibodies, agonists, complementary sequences, or vectors of the invention may be administered in combination with other appropriate therapeutic agents. Selection of the appropriate agents for use in combination therapy may be made by one of ordinary skill in the art, according to conventional pharmaceutical principles. The combination of therapeutic agents may act synergistically to effect the treatment or prevention of the various disorders described above. Using this approach, one may be able to achieve therapeutic efficacy with lower dosages of each agent, thus reducing the potential for adverse side effects. An antagonist of CKSR may be produced using methods which are generally known in the art. In particular, purified CKSR may be used to produce antibodies or to screen libraries of pharmaceutical agents to identify those which specifically bind CKSR. Antibodies to CKSR may also be generated using methods that are well known in the art. Such antibodies may include, but are not limited to, polyclonal, monoclonal, chimeric, and single chain antibodies, Fab fragments, and fragments produced by a Fab expression library. Neutralizing antibodies (i.e.. those which inhibit dimer formation) are generally preferred for therapeutic use. For the production of antibodies, various hosts including goats, rabbits, rats, mice, humans, and others may be immunized by injection with CKSR or with any fragment or oligopeptide thereof which has immunogenic properties. Depending on the host species, various adjuvants may be used to increase immunological response. Such adjuvants include, but are not limited to, Freund's, mineral gels such as aluminum hydroxide, and surface active substances such as lysolecithin, pluronic polyols, polyanions, peptides, oil emulsions, KLH, and dinitrophenol. Among adjuvants used in humans, BCG (bacilli Calmette-Guerin) and Corvnebacterium parvum are especially preferable. It is preferred that the oligopeptides, peptides, or fragments used to induce antibodies to CKSR have an amino acid sequence consisting of at least about 5 amino acids, and generally will consist of at least about 10 amino acids. It is also preferable that these oligopeptides, peptides, or fragments are identical to a portion of the amino acid sequence of the natural protein and contain the entire amino acid sequence of a small, naturally occurring molecule. Short stretches of CKSR amino acids may be fused with those of another protein, such as KLH, and antibodies to the chimeric molecule may be produced. Monoclonal antibodies to CKSR may be prepared using any technique which provides for the production of antibody molecules by continuous cell lines in culture. These include, but are not limited to, the hybridoma technique, the human B-cell hybridoma technique, and the EBV-hybridoma technique. (See, e.g., Kohler, G. et al. (1975) Nature 256:495-497; Kozbor, D. et al. (1985) J. Immunol. Methods 81 :31-42; Cote, R.J. et al. (1983) Proc. Natl. Acad. Sci. USA 80:2026-2030; and Cole, S.P. et al. (1984) Mol. Cell Biol. 62: 109-120.) In addition, techniques developed for the production of "chimeric antibodies." such as the splicing of mouse antibody genes to human antibody genes to obtain a molecule with appropriate antigen specificity and biological activity, can be used. (See, e.g., Morrison, S.L. et al. (1984) Proc. Natl. Acad. Sci. USA 81 :6851-6855; Neuberger, M.S. et al. ( 1984) Nature 312:604-608; and Takeda, S. et al. (1985) Nature 314:452-454.) Alternatively, techniques described for the production of single chain antibodies may be adapted, using methods known in the art, to produce CKSR-specific single chain antibodies. Antibodies with related specificity, but of distinct idiotypic composition, may be generated by chain shuffling from random combinatorial immunoglobulin libraries. (See, e.g., Burton, D.R. (1991) Proc. Natl. Acad. Sci. USA 88: 10134-10137.) Antibodies may also be produced by inducing in vivo production in the lymphocyte population or by screening immunoglobulin libraries or panels of highly specific binding reagents as disclosed in the literature. (See, e.g., Orlandi, R. et al. (1989) Proc. Natl. Acad. Sci. USA 86:3833-3837; Winter. G. et al. (1991) Nature 349:293-299.) Antibody fragments which contain specific binding sites for CKSR may also be generated. For example, such fragments include, but are not limited to, F(ab') 2 fragments produced by pepsin digestion of the antibody molecule and Fab fragments generated by reducing the disulfide bridges of the F(ab')2 fragments. Alternatively, Fab expression libraries may be constructed to allow rapid and easy identification of monoclonal Fab fragments with the desired specificity. (See, e.g., Huse, W.D. et al. ( 1989) Science 246: 1275- 1281.) Various immunoassays may be used for screening to identify antibodies having the desired specificity. Numerous protocols for competitive binding or immunoradiometric assays using either polyclonal or monoclonal antibodies with established specificities are well known in the art. Such immunoassays typically involve the measurement of complex formation between CKSR and its specific antibody. A two-site, monoclonal-based immunoassay utilizing monoclonal antibodies reactive to two non-interfering CKSR epitopes is generally used, but a competitive binding assay may also be employed (Pound, supra). Various methods such as Scatchard analysis in conjunction with radioimmunoassay techniques may be used to assess the affinity of antibodies for CKSR. Affinity is expressed as an association constant, K_, which is defined as the molar concentration of CKSR-antibody complex divided by the moiar concentrations of free antigen and free antibody under equilibrium conditions. The K- determined for a preparation of polyclonal antibodies, which are heterogeneous in their affinities for multiple CKSR epitopes. represents the average affinity, or avidity, of the antibodies for CKSR. The K a determined for a preparation of monoclonal antibodies, which are monospecific for a particular CKSR epitope, represents a true measure of affinity. High-affinity antibody preparations with K a ranging from about 10 9 to 10 12 L/mole are preferred for use in immunoassays in which the CKSR-antibody complex must withstand rigorous manipulations. Low-affinity antibody preparations with K a ranging from about 10 6 to 10 7 L/mole are preferred for use in immunopurification and similar procedures which ultimately require dissociation of CKSR, preferably in active form, from the antibody (Catty, DJ 1988) Antibodies. Volume I: A Practical Approach. IRL Press, Washington, DC; Liddell, J.E. and Cryer, A. ( 1991 ) A Practical Guide to Monoclonal Antibodies. John Wiley & Sons, New York NY). The titer and avidity of polyclonal antibody preparations may be further evaluated to determine the quality and suitability of such preparations for certain downstream applications. For example, a polyclonal antibody preparation containing at least 1-2 mg specific antibody/ml, preferably 5-10 mg specific antibody/ml, is generally employed in procedures requiring precipitation of CKSR- antibody complexes. Procedures for evaluating antibody specificity, titer, and avidity, and guidelines for antibody quality and usage in various applications, are generally available. (See, e.g., Catty, supra, and Coligan et al. supra.) In another embodiment of the invention, the polynucleotides encoding CKSR, or any fragment or complement thereof, may be used for therapeutic purposes. In one aspect, the complement of the polynucleotide encoding CKSR may be used in situations in which it would be desirable to block the transcription of the mRNA. In particular, cells may be transformed with sequences complementary to polynucleotides encoding CKSR. Thus, complementary molecules or fragments may be used to modulate CKSR activity, or to achieve regulation of gene function. Such technology is now well known in the art. and sense or antisense oligonucleotides or larger fragments can be designed from various locations along the coding or control regions of sequences encoding CKSR. Expression vectors derived from retroviruses. adenoviruses, or heφes or vaccinia viruses, or from various bacterial plasmids, may be used for delivery of nucleotide sequences to the targeted organ, tissue, or cell population. Methods which are well known to those skilled in the art can be used to construct vectors to express nucleic acid sequences complementary to the polynucleotides encoding CKSR. (See, e.g., Sambrook. supra; Ausubel, 1995, supra.) Genes encoding CKSR can be turned off by transforming a cell or tissue with expression vectors which express high levels of a polynucleotide. or fragment thereof, encoding CKSR. Such constructs may be used to introduce untranslatable sense or antisense sequences into a cell. Even in the absence of integration into the DNA, such vectors may continue to transcribe RNA molecules until they are disabled by endogenous nucleases. Transient expression may last for a month or more with a non-replicating vector, and may last even longer if appropriate replication elements are part of the vector system. As mentioned above, modifications of gene expression can be obtained by designing complementary sequences or antisense molecules (DNA. RNA. or PNA) to the control, 5', or regulatory regions of the gene encoding CKSR. Oligonucleotides derived from the transcription initiation site, e.g., between about positions - 10 and + 10 from the start site, may be employed. Similarly, inhibition can be achieved using triple helix base-pairing methodology. Triple helix pairing is useful because it causes inhibition of the ability of the double helix to open sufficiently for the binding of polymerases, transcription factors, or regulatory molecules. Recent therapeutic advances using triplex DNA have been described in the literature. (See. e.g., Gee, J.E. et al. (1994) in Huber, B.E. and B.I. Carr. Molecular and Immunologic Approaches, Futura Publishing, Mt. Kisco NY, pp. 163-177.) A complementary sequence or antisense molecule may also be designed to block translation of mRNA by preventing the transcript from binding to ribosomes. Ribozymes, enzymatic RNA molecules, may also be used to catalyze the specific cleavage of RNA. The mechanism of ribozyme action involves sequence-specific hybridization of the ribozyme molecule to complementary target RNA, followed by endonucleolytic cleavage. For example, engineered hammerhead motif ribozyme molecules may specifically and efficiently catalyze endonucleolytic cleavage of sequences encoding CKSR. Specific ribozyme cleavage sites within any potential RNA target are initially identified by scanning the target molecule for ribozyme cleavage sites, including the following sequences: GUA, GUU, and GUC. Once identified, short RNA sequences of between 15 and 20 ribonucleotides, corresponding to the region of the target gene containing the cleavage site, may be evaluated for secondary structural features which may render the oligonucleotide inoperable. The suitability of candidate targets may also be evaluated by testing accessibility to hybridization with complementary oligonucleotides using ribonuclease protection assays. Complementary ribonucleic acid molecules and ribozymes of the invention may be prepared by any method known in the art for the synthesis of nucleic acid molecules. These include techniques for chemically synthesizing oligonucleotides such as solid phase phosphoramidite chemical synthesis. Alternatively, RNA molecules may be generated by in vitro and in vivo transcription of DNA sequences encoding CKSR. Such DNA sequences may be incorporated into a wide variety of vectors with suitable RNA polymerase promoters such as T7 or SP6. Alternatively, these cDNA constructs that synthesize complementary RNA. constitutively or inducibly, can be introduced into cell lines, cells, or tissues. RNA molecules may be modified to increase intracellular stability and half-life. Possible modifications include, but are not limited to, the addition of flanking sequences at the 5' and/or 3' ends of the molecule, or the use of phosphorothioate or 2' O-methyl rather than phosphodiesterase linkages within the backbone of the molecule. This concept is inherent in the production of PNAs and can be extended in all of these molecules by the inclusion of nontraditional bases such as inosine, queosine. and wybutosine, as well as acetyl-, methyl-, thio-, and similarly modified forms of adenine, cytidine, guanine. thymine. and uridine which are not as easily recognized by endogenous endonucleases. Many methods for introducing vectors into cells or tissues are available and equally suitable for use in vivo, in vitro, and ex vivo. For ex vivo therapy, vectors may be introduced into stem cells taken from the patient and clonally propagated for autologous transplant back into that same patient. Delivery by transfection, by liposome injections, or by polycationic amino polymers may be achieved using methods which are well known in the art. (See, e.g., Goldman, C.K. et al. (1997) Nat. Biotechnol. 15:462-466.) Any of the therapeutic methods described above may be applied to any subject in need of such therapy, including, for example, mammals such as humans, dogs, cats, cows, horses, rabbits, and monkeys. An additional embodiment of the invention relates to the administration of a pharmaceutical or sterile composition, in conjunction with a pharmaceutically acceptable carrier, for any of the therapeutic effects discussed above. Such pharmaceutical compositions may consist of CKSR, antibodies to CKSR. and mimetics, agonists, antagonists, or inhibitors of CKSR. The compositions may be administered alone or in combination with at least one other agent, such as a stabilizing compound, which may be administered in any sterile, biocompatible pharmaceutical carrier including, but not limited to, saline, buffered saline, dextrose, and water. The compositions may be administered to a patient alone, or in combination with other agents, drugs, or hormones. The pharmaceutical compositions utilized in this invention may be administered by any number of routes including, but not limited to, oral, intravenous, intramuscular, intra-arterial, intramedullary, intrathecal, intraventricular, transdermal, subcutaneous, intraperitoneal, intranasal, enteral, topical, sublingual, or rectal means. In addition to the active ingredients, these pharmaceutical compositions may contain suitable pharmaceutically-acceptable carriers comprising excipients and auxiliaries which facilitate processing of the active compounds into preparations which can be used pharmaceutically. Further details on techniques for formulation and administration may be found in the latest edition of Remington's Pharmaceutical Sciences (Maack Publishing, Easton PA). Pharmaceutical compositions for oral administration can be formulated using pharmaceutically acceptable carriers well known in the art in dosages suitable for oral administration. Such carriers enable the pharmaceutical compositions to be formulated as tablets, pills, dragees, capsules, liquids, gels, syrups, slurries, suspensions, and the like, for ingestion by the patient. Pharmaceutical preparations for oral use can be obtained through combining active compounds with solid excipient and processing the resultant mixture of granules (optionally, after grinding) to obtain tablets or dragee cores. Suitable auxiliaries can be added, if desired. Suitable excipients include carbohydrate or protein fillers, such as sugars, including lactose, sucrose, mannitol, and sorbitol; starch from corn, wheat, rice, potato, or other plants; cellulose, such as methyl cellulose, hydroxypropylmethyl-cellulose. or sodium carboxymethylcellulose; gums, including arabic and tragacanth; and proteins, such as gelatin and collagen. If desired, disintegrating or solubilizing agents may be added, such as the cross-linked polyvinyl pyrrolidone. agar, and alginic acid or a salt thereof, such as sodium alginate. Dragee cores may be used in conjunction with suitable coatings, such as concentrated sugar solutions, which may also contain gum arabic, talc, polyvinylpyrrolidone, carbopol gel, polyethylene glycol, and/or titanium dioxide, lacquer solutions, and suitable organic solvents or solvent mixtures. Dyestuffs or pigments may be added to the tablets or dragee coatings for product identification or to characterize the quantity of active compound, i.e., dosage. Pharmaceutical preparations which can be used orally include push-fit capsules made of gelatin, as well as soft, sealed capsules made of gelatin and a coating, such as glycerol or sorbitol. Push-fit capsules can contain active ingredients mixed with fillers or binders, such as lactose or starches, lubricants, such as talc or magnesium stearate, and, optionally, stabilizers. In soft capsules, the active compounds may be dissolved or suspended in suitable liquids, such as fatty oils, liquid, or liquid polyethylene glycol with or without stabilizers. Pharmaceutical formulations suitable for parenteral administration may be formulated in aqueous solutions, preferably in physiologically compatible buffers such as Hanks' solution, Ringer's solution, or physiologically buffered saline. Aqueous injection suspensions may contain substances which increase the viscosity of the suspension, such as sodium carboxymethyl cellulose, sorbitol, or dextran. Additionally, suspensions of the active compounds may be prepared as appropriate oily injection suspensions. Suitable lipophilic solvents or vehicles include fatty oils, such as sesame oil, or synthetic fatty acid esters, such as ethyl oleate. triglycerides, or liposomes. Non-lipid polycationic amino polymers may also be used for delivery. Optionally, the suspension may also contain suitable stabilizers or agents to increase the solubility of the compounds and allow for the preparation of highly concentrated solutions. For topical or nasal administration, penetrants appropriate to the particular barrier to be permeated are used in the formulation. Such penetrants are generally known in the art. The pharmaceutical compositions ofthe present invention may be manufactured in a manner that is known in the art. e.g., by means of conventional mixing, dissolving, granulating, dragee-making, levigating, emulsifying, encapsulating, entrapping, or lyophilizing processes. The pharmaceutical composition may be provided as a salt and can be formed with many acids, including but not limited to. hydrochloric, sulfuric, acetic, lactic, tartaric, malic, and succinic acids. Salts tend to be more soluble in aqueous or other protonic solvents than are the corresponding free base forms. In other cases, the preparation may be a lyophilized powder which may contain any or all ofthe following: 1 mM to 50 mM histidine. 0.1 % to 2% sucrose, and 2%> to 7% mannitol. at a pH range of 4.5 to 5.5, that is combined with buffer prior to use. After pharmaceutical compositions have been prepared, they can be placed in an appropriate container and labeled for treatment of an indicated condition. For administration of CKSR, such labeling would include amount, frequency, and method of administration. Pharmaceutical compositions suitable for use in the invention include compositions wherein the active ingredients are contained in an effective amount to achieve the intended purpose. The determination of an effective dose is well within the capability of those skilled in the art. For any compound, the therapeutically effective dose can be estimated initially either in cell culture assays, e.g., of neoplastic cells, or in animal models such as mice. rats, rabbits, dogs, or pigs. An animal model may also be used to determine the appropriate concentration range and route of administration. Such information can then be used to determine useful doses and routes for administration in humans. A therapeutically effective dose refers to that amount of active ingredient, for example CKSR or fragments thereof, antibodies of CKSR, and agonists, antagonists or inhibitors of CKSR, which ameliorates the symptoms or condition. Therapeutic efficacy and toxicity may be determined by standard pharmaceutical procedures in cell cultures or with experimental animals, such as by calculating the ED 50 (the dose therapeutically effective in 50% of the population) or LD 50 (the dose lethal to 50% of the population) statistics. The dose ratio of toxic to therapeutic effects is the therapeutic index, which can be expressed as the LD 50 /ED 50 ratio. Pharmaceutical compositions which exhibit large therapeutic indices are preferred. The data obtained from cell culture assays and animal studies are used to formulate a range of dosage for human use. The dosage contained in such compositions is preferably within a range of circulating concentrations that includes the ED 50 with little or no toxicity. The dosage varies within this range depending upon the dosage form employed, the sensitivity ofthe patient, and the route of administration. The exact dosage will be determined by the practitioner, in light of factors related to the subject requiring treatment. Dosage and administration are adjusted to provide sufficient levels ofthe active moiety or to maintain the desired effect. Factors which may be taken into account include the severity ofthe disease state, the general health of the subject, the age, weight, and gender ofthe subject, time and frequency of administration, drug combination(s), reaction sensitivities, and response to therapy. Long-acting pharmaceutical compositions may be administered every 3 to 4 days, every week, or biweekly depending on the half-life and clearance rate ofthe particular formulation. Normal dosage amounts may vary from about 0.1 μg to 100,000 μg, up to a total dose of about 1 gram, depending upon the route of administration. Guidance as to particular dosages and methods of delivery is provided in the literature and generally available to practitioners in the art. Those skilled in the art will employ different formulations for nucleotides than for proteins or their inhibitors. Similarly, delivery of polynucleotides or polypeptides will be specific to particular cells, conditions, locations, etc. DIAGNOSTICS In another embodiment, antibodies which specifically bind CKSR may be used for the diagnosis of disorders characterized by expression of CKSR. or in assays to monitor patients being treated with CKSR or agonists, antagonists, or inhibitors of CKSR. Antibodies useful for diagnostic purposes may be prepared in the same manner as described above for therapeutics. Diagnostic assays for CKSR include methods which utilize the antibody and a label to detect CKSR in human body fluids or in extracts of cells or tissues. The antibodies may be used with or without modification, and may be labeled by covalent or non-covalent attachment of a reporter molecule. A wide variety of reporter molecules, several of which are described above, are known in the art and may be used. A variety of protocols for measuring CKSR. including ELISAs, RIAs, and FACS. are known in the art and provide a basis for diagnosing altered or abnormal levels of CKSR expression. Normal or standard values for CKSR expression are established by combining body fluids or cell extracts taken from normal mammalian subjects, for example, human subjects, with antibody to CKSR under conditions suitable for complex formation. The amount of standard complex formation may be quantitated by various methods, such as photometric means. Quantities of CKSR expressed in subject, control, and disease samples from biopsied tissues are compared with the standard values. Deviation between standard and subject values establishes the parameters for diagnosing disease. In another embodiment of the invention, the polynucleotides encoding CKSR may be used for diagnostic purposes. The polynucleotides which may be used include oligonucleotide sequences, complementary RNA and DNA molecules, and PNAs. The polynucleotides may be used to detect and quantify gene expression in biopsied tissues in which expression of CKSR may be correlated with disease. The diagnostic assay may be used to determine absence, presence, and excess expression of CKSR. and to monitor regulation of CKSR levels during therapeutic intervention. In one aspect, hybridization with PCR probes which are capable of detecting polynucleotide sequences, including genomic sequences, encoding CKSR or closely related molecules may be used to identify nucleic acid sequences which encode CKSR. The specificity of the probe, whether it is made from a highly specific region, e.g., the 5' regulatory region, or from a less specific region, e.g., a conserved motif, and the stringency of the hybridization or amplification will determine whether the probe identifies only naturally occurring sequences encoding CKSR. allelic variants, or related sequences. Probes may also be used for the detection of related sequences, and may have at least 50% sequence identity to any of the CKSR encoding sequences. The hybridization probes of the subject invention may be DNA or RNA and may be derived from the sequence of SEQ ID NO:3-4 or from genomic sequences including promoters, enhancers, and introns ofthe CKSR gene. Means for producing specific hybridization probes for DNAs encoding CKSR include the cloning of polynucleotide sequences encoding CKSR or CKSR derivatives into vectors for the production of mRNA probes. Such vectors are known in the art, are commercially available, and may be used to synthesize RNA probes in vitro by means of the addition of the appropriate RNA polymerases and the appropriate labeled nucleotides. Hybridization probes may be labeled by a variety of reporter groups, for example, by radionuclides such as 32 P or 5 S, or by enzymatic labels, such as alkaline phosphatase coupled to the probe via avidin/biotin coupling systems, and the like. Polynucleotide sequences encoding CKSR may be used for the diagnosis of disorders associated with expression of CKSR. Examples of such disorders include, but are not limited to, a cell proliferative disorder such as actinic keratosis, arteriosclerosis, atherosclerosis, bursitis, cirrhosis, hepatitis, mixed connective tissue disease (MCTD), myelofibrosis, paroxysmal nocturnal hemoglobinuria, polycythemia vera, psoriasis, primary thrombocythemia, and a cancer including adenocarcinoma. leukemia, lymphoma, melanoma, myeloma, sarcoma, teratocarcinoma, and, in particular, a cancer of the adrenal gland, bladder, bone, bone marrow, brain, breast, cervix, gall bladder, ganglia, gastrointestinal tract, heart, kidney, liver, lung, muscle, ovary, pancreas, parathyroid, penis, prostate, salivary glands, skin, spleen, testis, thymus, thyroid, and uterus: and an immune disorder such as acquired immunodeficiency syndrome (AIDS), Addison's disease, adult respiratory distress syndrome, allergies, ankylosing spondylitis. amyloidosis. anemia, asthma, atherosclerosis, autoimmune hemolytic anemia, autoimmune thyroiditis. autoimmune polyenodocrinopathy- candidiasis-ectodermal dystrophy (APECED), bronchitis, cholecystitis, contact dermatitis, Crohn's disease, atopic dermatitis, dermatomyositis. diabetes mellitus, emphysema, episodic lymphopenia with lymphocytotoxins. erythroblastosis fetalis. erythema nodosum. atrophic gastritis. glomerulonephritis, Goodpasture ' s syndrome, gout, Graves ' disease. Hashimoto ' s thyroiditis, hypereosinophilia, irritable bowel syndrome, multiple sclerosis, myasthenia gravis. myocardial or pericardial inflammation, osteoarthritis. osteoporosis, pancreatitis, polymyositis, psoriasis, Reiter ' s syndrome, rheumatoid arthritis, scleroderma, Sjδgren ' s syndrome, systemic anaphylaxis, systemic lupus erythematosus. systemic sclerosis, thrombocytopenic purpura, ulcerative colitis, uveitis, Werner syndrome, complications of cancer, hemodialysis, and extracorporeal circulation, viral, bacterial, fungal, parasitic, protozoal, and helminthic infections, and trauma. The polynucleotide sequences encoding CKSR may be used in Southern or northern analysis, dot blot, or other membrane-based technologies: in PCR technologies; in dipstick, pin, and multiformat ELISA-Iike assays; and in microarrays utilizing fluids or tissues from patients to detect altered CKSR expression. Such qualitative or quantitative methods are well known in the art. In a particular aspect, the nucleotide sequences encoding CKSR may be useful in assays that detect the presence of associated disorders, particularly those mentioned above. The nucleotide sequences encoding CKSR may be labeled by standard methods and added to a fluid or tissue sample from a patient under conditions suitable for the formation of hybridization complexes. After a suitable incubation period, the sample is washed and the signal is quantified and compared with a standard value. If the amount of signal in the patient sample is significantly altered in comparison to a control sample then the presence of altered levels of nucleotide sequences encoding CKSR in the sample indicates the presence of the associated disorder. Such assays may also be used to evaluate the efficacy of a particular therapeutic treatment regimen in animal studies, in clinical trials, or to monitor the treatment of an individual patient. In order to provide a basis for the diagnosis of a disorder associated with expression of CKSR, a normal or standard profile for expression is established. This may be accomplished by combining body fluids or cell extracts taken from normal subjects, either animal or human, with a sequence, or a fragment thereof, encoding CKSR, under conditions suitable for hybridization or amplification. Standard hybridization may be quantified by comparing the values obtained from normal subjects with values from an experiment in which a known amount of a substantially purified polynucleotide is used. Standard values obtained in this manner may be compared with values obtained from samples from patients who are symptomatic for a disorder. Deviation from standard values is used to establish the presence of a disorder. Once the presence of a disorder is established and a treatment protocol is initiated, hybridization assays may be repeated on a regular basis to determine if the level of expression in the patient begins to approximate that which is observed in the normal subject. The results obtained from successive assays may be used to show the efficacy of treatment over a period ranging from several days to months. With respect to cancer, the presence of an abnormal amount of transcript (either under- or overexpressed) in biopsied tissue from an individual may indicate a predisposition for the development of the disease, or may provide a means for detecting the disease prior to the appearance of actual clinical symptoms. A more definitive diagnosis of this type may allow health professionals to employ preventative measures or aggressive treatment earlier thereby preventing the development or further progression ofthe cancer. Additional diagnostic uses for oligonucleotides designed from the sequences encoding CKSR may involve the use of PCR. These oligomers may be chemically synthesized, generated enzymaticaliy, or produced in vitro. Oligomers will preferably contain a fragment of a polynucleotide encoding CKSR, or a fragment of a polynucleotide complementary to the polynucleotide encoding CKSR, and will be employed under optimized conditions for identification of a specific gene or condition. Oligomers may also be employed under less stringent conditions for detection or quantification of closely related DNA or RNA sequences. Methods which may also be used to quantify the expression of CKSR include radiolabeling or biotinylating nucleotides, coamplification of a control nucleic acid, and interpolating results from standard curves. (See, e.g., Melby, P.C. et al. (1993) J. Immunol. Methods 159:235-244; Duplaa, C. et al. (1993) Anal. Biochem. 212:229-236.) The speed of quantitation of multiple samples may be accelerated by running the assay in a high-throughput format where the oligomer of interest is presented in various dilutions and a spectrophotometric or colorimetric response gives rapid quantitation. In further embodiments, oligonucleotides or longer fragments derived from any ofthe polynucleotide sequences described herein may be used as targets in a microarray. The microarray can be used to monitor the expression level of large numbers of genes simultaneously and to identify genetic variants, mutations, and polymorphisms. This information may be used to determine gene function, to understand the genetic basis of a disorder, to diagnose a disorder, and to develop and monitor the activities of therapeutic agents. Microarrays may be prepared, used, and analyzed using methods known in the art. (See, e.g., Brennan, T.M. et al. (1995) U.S. Patent No. 5.474,796; Schena, M. et al. (1996) Proc. Natl. Acad. Sci. USA 93: 10614- 10619; Baldeschweiler et al. ( 1995) PCT application W095/251 1 16; Shalon, D. et al. ( 1995) PCT application WO95/35505; Heller. R.A. et al. ( 1997) Proc. Natl. Acad. Sci. USA 94:2150- 2155; and Heller. M.J. et al. ( 1997) U.S. Patent No. 5,605.662.) In another embodiment of the invention, nucleic acid sequences encoding CKSR may be used to generate hybridization probes useful in mapping the naturally occurring genomic sequence. The sequences may be mapped to a particular chromosome, to a specific region of a chromosome, or to artificial chromosome constructions, e.g., human artificial chromosomes (HACs), yeast artificial chromosomes (YACs), bacterial artificial chromosomes (BACs). bacterial PI constructions, or single chromosome cDNA libraries. (See, e.g., Harrington, J.J. et al. (1997) Nat. Genet. 15:345-355; Price, CM. (1993) Blood Rev. 7: 127-134; and Trask, B.JJ 1991 ) Trends Genet. 7: 149-154.) Fluorescent in situ hybridization (FISH) may be correlated with other physical chromosome mapping techniques and genetic map data. (See, e.g., Heinz-Ulrich, et al. ( 1995) in Meyers, supra, pp. 965-968.) Examples of genetic map data can be found in various scientific journals or at the Online Mendelian Inheritance in Man (OMIM) World Wide Web site. Correlation between the location of the gene encoding CKSR on a physical chromosomal map and a specific disorder, or a predisposition to a specific disorder, may help define the region of DNA associated with that disorder. The nucleotide sequences of the invention may be used to detect differences in gene sequences among normal, carrier, and affected individuals. In situ hybridization of chromosomal preparations and physical mapping techniques, such as linkage analysis using established chromosomal markers, may be used for extending genetic maps. Often the placement of a gene on the chromosome of another mammalian species, such as mouse, may reveal associated markers even if the number or arm of a particular human chromosome is not known. New sequences can be assigned to chromosomal arms by physical mapping. This provides valuable information to investigators searching for disease genes using positional cloning or other gene discovery techniques. Once the disease or syndrome has been crudely localized by genetic linkage to a particular genomic region, e.g., ataxia-telangiectasia to 1 lq22-23, any sequences mapping to that area may represent associated or regulatory genes for further investigation. (See, e.g., Gatti, R.A. et al. ( 1988) Nature 336:577-580.) The nucleotide sequence of the subject invention may also be used to detect differences in the chromosomal location due to translocation, inversion, etc., among normal, carrier, or affected individuals. In another embodiment of the invention, CKSR. its catalytic or immunogenic fragments, or oligopeptides thereof can be used for screening libraries of compounds in any of a variety of drug screening techniques. The fragment employed in such screening may be free in solution, affixed to a solid support, borne on a cell surface, or located intracellularly. The formation of binding complexes between CKSR and the agent being tested may be measured. Another technique for drug screening provides for high throughput screening of compounds having suitable binding affinity to the protein of interest. (See, e.g., Geysen. et al. (1984) PCT application WO84/03564.) In this method, large numbers of different small test compounds are synthesized on a solid substrate. The test compounds are reacted with CKSR, or fragments thereof, and washed. Bound CKSR is then detected by methods well known in the art. Purified CKSR can also be coated directly onto plates for use in the aforementioned drug screening techniques. Alternatively, non-neutralizing antibodies can be used to capture the peptide and immobilize it on a solid support. In another embodiment, one may use competitive drug screening assays in which neutralizing antibodies capable of binding CKSR specifically compete with a test compound for binding CKSR. In this manner, antibodies can be used to detect the presence of any peptide which shares one or more antigenic determinants with CKSR. In additional embodiments, the nucleotide sequences which encode CKSR may be used in any molecular biology techniques that have yet to be developed, provided the new techniques rely on properties of nucleotide sequences that are currently known, including, but not limited to, such properties as the triplet genetic code and specific base pair interactions. Without further elaboration, it is believed that one skilled in the art can. using the preceding description, utilize the present invention to its fullest extent. The following preferred specific embodiments are. therefore, to be construed as merely illustrative, and not limitative ofthe remainder ofthe disclosure in any way whatsoever. The disclosures of all patents, applications, and publications mentioned above and below, in particular U.S. Ser. No. 09/189,035, are hereby expressly incoφorated by reference. EXAMPLES I. Construction of cDNA Libraries PROSNON01 The PROSNON01 normalized cDNA library was constructed from prostate tissue obtained from a 28-year-old Caucasian male. The frozen tissue was homogenized and lysed in guanidinium isothiocyanate solution using a Polytron PT-3000 homogenizer (Brinkmann Instruments, Westbury NY). The lysate was centrifuged over a 5.7 M CsCI cushion using an Beckman SW28 rotor in an L8-70M ultracentrifuge (Beckman Instruments) for 18 hours at 25,000 rpm at ambient temperature. The RNA was extracted with acid phenol, precipitated using sodium acetate and ethanol. resuspended in RNAse-free water, and treated with DNase. The RNA was extracted with acid phenol and precipitated as before. Poly(A+) RNA was isolated using the OLIGOTEX kit (QIAGEN. Inc., Chatsworth CA). Poly(A+) RNA was used for cDNA synthesis and library construction according to the recommended protocols in the SUPERSCRIPT plasmid system (Life Technologies). cDNAs were fractionated on a SEPHAROSE CL4B column (Pharmacia Amersham Biotech. Piscataway NJ) and those cDNAs exceeding 400 bp were ligated into PSPORTl (Life Technologies) and subsequently transformed into DH 12S competent cells (Life Technologies). 4.4 X 1 0 6 independent plasmid clones in DH 12S cells (Life Technologies) were grown in liquid culture containing 25 mg/L carbenicillin and 1 mg/ml methicillin until the OD600 reached a value of 0.2. The culture was then superinfected with helper phage M 13K07 at a 5-fold excess. according to the method ofVieira et al. ( 1987. Methods Enzymol. 153:3- 1 I ). To reduce the number of excess cDNA copies according to their abundance levels in the library-, the cDNA library was then normalized in a single round according to the procedure of Soares et al. ( 1 94. Proc. Natl. Acad. Sci. USA 91 :9928-9932). with the following modifications: 1 ) the primer to template ratio in the primer extension reaction was increased from 2: 1 to 10: 1 : 2) the ddNTP concentration was reduced to 150μM each ddNTP; 3) the reannealing hybridization was extended from 13 to 19 hours: and 4) the single stranded DNA circles of the normalized library were purified by hydroxyapatite chromatography and converted to partially double-stranded by random priming, followed by electroporation into DH 10B competent cells (Life Technologies). THYRNOT08 The THYRNOT08 cDNA library was constructed using RNA isolated from thyroid gland tissue obtained from a 13-year-old Caucasian female during a complete thyroidectomy. Pathology indicated lymphocytic thyroiditis. Patient history included attention deficeit disorder. Family history included chronic obstructive asthma, attention deficeit disorder, and depressive disorder. The frozen tissue was homogenized and lysed in TRIZOL reagent (Life Technologies), a monophasic solution of phenol and guanidine isothiocyanate. using a Polytron PT-3000 homogenizer (Brinkmann Instruments). After a brief incubation on ice, chloroform was added ( 1 :5 v/v), and the lysate was centrifuged. The upper chloroform layer was removed and the RNA extracted with isopropanol, resuspended in water, and treated with DNase for 25 min at 37°C. Extraction and precipitation were repeated. Poly(A+) RNA was isolated using the OLIGOTEX kit (QIAGEN). Poly(A+) RNA was used for cDNA synthesis and library construction according to the recommended protocols in the SUPERSCRIPT plasmid system (Life Technologies). cDNAs were fractionated on a SEPHAROSE CL4B column (Pharmacia Amersham Biotech) and those cDNAs exceeding 400 bp were ligated into pINCY (Incyte Pharmaceuticals, Inc., Palo Alto CA) and subsequently transformed into DH5α competent cells (Life Technologies). II. Isolation of cDNA Clones Plasmids were recovered from host cells by in vivo excision using the UNIZAP vector system (Stratagene) or by cell lysis. Plasmids were purified using at least one of the following: a Magic or WIZARD Minipreps DNA purification system (Promega); an AGTC Miniprep purification kit (Edge Biosystems, Gaithersburg MD): and QIAWELL 8 Plasmid. QIAWELL 8 Plus Plasmid, QIAWELL 8 Ultra Plasmid purification systems or the R.E.A.L. PREP 96 plasmid purification kit from QIAGEN. Following precipitation, plasmids were resuspended in 0.1 ml of distilled water and stored, with or without lyophilization, at 4°C. Alternatively, plasmid DNA was amplified from host cell lysates using direct link PCR in a high-throughput format (Rao, V.BJ 1994) Anal. Biochem. 216: 1 -14). Host cell lysis and thermal cycling steps were carried out in a single reaction mixture. Samples were processed and stored in 384- well plates, and the concentration of amplified plasmid DNA was quantified fluorometrically using PICOGREEN dye (Molecular Probes, Eugene OR) and a FLUOROSKAN II fluorescence scanner (Labsystems Oy, Helsinki, Finland). III. Sequencing and Analysis cDNA sequencing reactions were processed using standard methods or high-throughput instrumentation such as the ABI CATALYST 800 (Perkin-Elmer) thermal cycler or the PTC-200 thermal cycler (MJ Research) in conjunction with the HYDRA microdispenser (Robbins Scientific) or the MICROLAB 2200 (Hamilton) liquid transfer system. cDNA sequencing reactions were prepared using reagents provided by Amersham Pharmacia Biotech or supplied in ABI sequencing kits such as the ABI PRISM BIGDYE Terminator cycle sequencing ready reaction kit (Perkin-Elmer). Electrophoretic separation of cDNA sequencing reactions and detection of labeled polynucleotides were carried out using the MEGABACE 1000 DNA sequencing system (Molecular Dynamics); the ABI PRISM 373 or 377 sequencing system (Perkin-Elmer) in conjunction with standard ABI protocols and base calling software; or other sequence analysis systems known in the art. Reading frames within the cDNA sequences were identified using standard methods (reviewed in Ausubel, 1997, supra, unit 1.1). Some ofthe cDNA sequences were selected for extension using the techniques disclosed in Example V. The polynucleotide sequences derived from cDNA sequencing were assembled and analyzed using a combination of software programs which utilize algorithms well known to those skilled in the art. Table 1 summarizes the tools, programs, and algorithms used and provides applicable descriptions, references, and threshold parameters. The first column of Table 1 shows the tools, programs, and algorithms used, the second column provides brief descriptions thereof, the third column presents appropriate references, all of which are incoφorated by reference herein in their entirety, and the fourth column presents, where applicable, the scores, probability values, and other parameters used to evaluate the strength of a match between two sequences (the higher the score, the greater the homology between two sequences). Sequences were analyzed using MACDNASIS PRO software (Hitachi Software Engineering, South San Francisco CA) and LASERGENE software (DNASTAR). Polynucleotide and polypeptide sequence alignments were generated using the default parameters specified by the clustal algorithm as incoφorated into the MEGALIGN multisequence alignment program (DNASTAR), which also calculates the percent identity between aligned sequences. The polynucleotide sequences were validated by removing vector, linker, and polyA sequences and by masking ambiguous bases, using algorithms and programs based on BLAST, dynamic programing, and dinucleotide nearest neighbor analysis. The sequences were then queried against a selection of public databases such as the GenBank primate, rodent, mammalian, vertebrate, and eukaryote databases, and BLOCKS. PRINTS, DOMO, PRODOM, and PFAM to acquire annotation using programs based on BLAST, FASTA, and BLIMPS. The sequences were assembled into full length polynucleotide sequences using programs based on Phred, Phrap. and Consed, and were screened for open reading frames using programs based on GeneMark, BLAST, and FASTA. The full length polynucleotide sequences were translated to derive the corresponding full length amino acid sequences, and these full length sequences were subsequently analyzed by querying against databases such as the GenBank databases (described above). SwissProt. BLOCKS, PRINTS, DOMO, PRODOM, Prosite. and Hidden Markov Model (HMM)-based protein family databases such as PFAM. HMM is a probabilistic approach which analyzes consensus primary structures of gene families. (See. e.g., Eddy, S.R. ( 1996) Curr. Opin. Struct. Biol. 6:361-365.) The programs described above for the assembly and analysis of full length polynucleotide and amino acid sequences were also used to identify polynucleotide sequence fragments from SEQ ID NO:3-4. Fragments from about 20 to about 4000 nucleotides which are useful in hybridization and amplification technologies were described in The Invention section above. IV. Northern Analysis Northern analysis is a laboratory technique used to detect the presence of a transcript of a gene and involves the hybridization of a labeled nucleotide sequence to a membrane on which RNAs from a particular cell type or tissue have been bound. (See, e.g., Sambrook, supra, ch. 7; Ausubel, 1995. supra, ch. 4 and 16.) Analogous computer techniques applying BLAST were used to search for identical or related molecules in nucleotide databases such as GenBank or LIFESEQ (Incyte Pharmaceuticals). This analysis is much faster than multiple membrane-based hybridizations. In addition, the sensitivity of the computer search can be modified to determine whether any particular match is categorized as exact or similar. The basis ofthe search is the product score, which is defined as: % sequence identity x % maximum BLAST score 100 The product score takes into account both the degree of similarity between two sequences and the length of the sequence match. For example, with a product score of 40. the match will be exact within a 1% to 2% error, and, with a product score of 70, the match will be exact. Similar molecules are usually identified by selecting those which show product scores between 15 and 40, although lower scores may identify related molecules. The results of northern analyses are reported as a percentage distribution of libraries in which the transcript encoding CKSR occurred. Analysis involved the categorization of cDNA libraries by organ/tissue and disease. The organ/tissue categories included cardiovascular, dermatologic, developmental, endocrine, gastrointestinal, hematopoietic/immune, musculoskeletal, nervous, reproductive, and urologic. The disease/condition categories included cancer, inflammation, trauma, cell proliferation, neurological, and pooled. For each category, the number of libraries expressing the sequence of interest was counted and divided by the total number of libraries across all categories. Percentage values of tissue-specific and disease- or condition-specific expression are reported in the description of the invention. V. Extension of CKSR Encoding Polynucleotides The full length nucleic acid sequences of SEQ ID NO:3-4 were produced by extension of an appropriate fragment of the full length molecule using oligonucleotide primers designed from this fragment. One primer was synthesized to initiate 5' extension of the known fragment, and the other primer, to initiate 3' extension ofthe known fragment. The initial primers were designed using OLIGO 4.06 software (National Biosciences), or another appropriate program, to be about 22 to 30 nucleotides in length, to have a GC content of about 50% or more, and to anneal to the target sequence at temperatures of about 68 C C to about 72°C. Any stretch of nucleotides which would result in haiφin structures and primer-primer dimerizations was avoided. Selected human cDNA libraries were used to extend the sequence. If more than one extension was necessary or desired, additional or nested sets of primers were designed. High fidelity amplification was obtained by PCR using methods well known in the art. PCR was performed in 96-well plates using the PTC-200 thermal cycler (MJ Research. Inc.). The reaction mix contained DNA template. 200 nmol of each primer, reaction buffer containing Mg 2 \ (NH ) 3 S0 , and β-mercaptoethanol, Taq DNA polymerase (Amersham Pharmacia Biotech), ELONGASE enzyme (Life Technologies), and Pfu DNA polymerase (Stratagene). with the following parameters for primer pair PCI A and PCI B: Step 1 : 94°C, 3 min; Step 2: 94 °C 15 sec: Step 3 : 60 °C, 1 min; Step 4: 68°C, 2 min; Step 5: Steps 2, 3, and 4 repeated 20 times; Step 6: 68°C 5 min; Step 7: storage at 4°C In the alternative, the parameters for primer pair T7 and SK+ were as follows: Step 1 : 94°C, 3 min; Step 2: 94°C, 15 sec; Step 3: 57°C, 1 min; Step 4: 68 °C 2 min; Step 5: Steps 2, 3, and 4 repeated 20 times; Step 6: 68 °C, 5 min; Step 7: storage at 4°C The concentration of DNA in each well was determined by dispensing 100 μl PICOGREEN quantitation reagent (0.25% (v/v) PICOGREEN; Molecular Probes, Eugene OR) dissolved in IX TE and 0.5 μl of undiluted PCR product into each well of an opaque fluorimeter plate (Corning Costar, Acton MA), allowing the DNA to bind to the reagent. The plate was scanned in a Fluoroskan II (Labsystems Oy. Helsinki, Finland) to measure the fluorescence of the sample and to quantify the concentration of DNA. A 5 μl to 10 μl aliquot of the reaction mixture was analyzed by electrophoresis on a 1 % agarose mini-gel to determine which reactions were successful in extending the sequence. The extended nucleotides were desalted and concentrated, transferred to 384-well plates, digested with CviJI cholera virus endonuclease (Molecular Biology Research, Madison Wl), and sonicated or sheared prior to religation into pUC 1 8 vector (Amersham Pharmacia Biotech). For shotgun sequencing, the digested nucleotides were separated on low concentration (0.6 to 0.8%) agarose gels, fragments were excised, and agar digested with Agar ACE (Promega). Extended clones were religated using T4 ligase (New England Biolabs. Beverly MA) into pUC 18 vector (Amersham Pharmacia Biotech), treated with Pfu DNA polymerase (Stratagene) to fill-in restriction site overhangs, and transfected into competent E. coli cells. Transformed cells were selected on antibiotic-containing media, individual colonies were picked and cultured overnight at 37°C in 384- well plates in LB/2x carb liquid media. The cells were lysed, and DNA was amplified by PCR using Taq DNA polymerase (Amersham Pharmacia Biotech) and Pfu DNA polymerase (Stratagene) with the following parameters: Step 1 : 94°C, 3 min; Step 2: 94°C, 15 sec; Step 3: 60°C, 1 min; Step 4: 72°C, 2 min; Step 5: steps 2, 3, and 4 repeated 29 times; Step 6: 72°C, 5 min; Step 7: storage at 4°C DNA was quantified by PICOGREEN reagent (Molecular Probes) as described above. Samples with low DNA recoveries were reamplified using the same conditions as described above. Samples were diluted with 20%> dimethysulfoxide ( 1 :2, v/v), and sequenced using DYENAMIC energy transfer sequencing primers and the DYENAMIC DIRECT kit (Amersham Pharmacia Biotech) or the ABI PRISM BIGDYE Terminator cycle sequencing ready reaction kit (Perkin-Elmer). In like manner, the nucleotide sequences of SEQ ID NO:3-4 are used to obtain 5' regulatory sequences using the procedure above, oligonucleotides designed for such extension, and an appropriate genomic library. VI. Labeling and Use of Individual Hybridization Probes Hybridization probes derived from SEQ ID NO:3-4 are employed to screen cDNAs, genomic DNAs, or mRNAs. Although the labeling of oligonucleotides. consisting of about 20 base pairs, is specifically described, essentially the same procedure is used with larger nucleotide fragments. Oligonucleotides are designed using state-of-the-art software such as OLIGO 4.06 software (National Biosciences) and labeled by combining 50 pmol of each oligomer, 250 μCi of [γ- 32 P] adenosine triphosphate (Amersham Pharmacia Biotech), and T4 polynucleotide kinase (DuPont NEN, Boston MA). The labeled oligonucleotides are substantially purified using a SEPHADEX G-25 superfine size exclusion dextran bead column (Amersham Pharmacia Biotech). An aliquot containing 10 7 counts per minute ofthe labeled probe is used in a typical membrane-based hybridization analysis of human genomic DNA digested with one of the following endonucleases: Ase I. Bgl II, Eco RI. Pst I, Xba I, or Pvu II (DuPont NEN). The DNA from each digest is fractionated on a 0.7% agarose gel and transferred to nylon membranes (Nytran Plus, Schleicher & Schuell, Durham NH). Hybridization is carried out for 16 hours at 40°C To remove nonspecific signals, blots are sequentially washed at room temperature under conditions of up to, for example. 0.1 x saline sodium citrate and 0.5%> sodium dodecyl sulfate. Hybridization patterns are visualized using autoradiography or an alternative imaging means and compared. VII. Microarrays A chemical coupling procedure and an ink jet device can be used to synthesize array elements on the surface of a substrate. (See, e.g., Baldeschweiler. supra.) An array analogous to a dot or slot blot may also be used to arrange and link elements to the surface of a substrate using thermal, UV, chemical, or mechanical bonding procedures. A typical array may be produced by hand or using available methods and machines and contain any appropriate number of elements. After hybridization, nonhybridized probes are removed and a scanner used to determine the levels and patterns of fluorescence. The degree of complementarity and the relative abundance of each probe which hybridizes to an element on the microarray may be assessed through analysis ofthe scanned images. Full-length cDNAs, Expressed Sequence Tags (ESTs), or fragments thereof may comprise the elements ofthe microarray. Fragments suitable for hybridization can be selected using software well known in the art such as LASERGENE software (DNASTAR). Full-length cDNAs, ESTs, or fragments thereof corresponding to one ofthe nucleotide sequences of the present invention, or selected at random from a cDNA library relevant to the present invention, are arranged on an appropriate substrate, e.g., a glass slide. The cDNA is fixed to the slide using, e.g., UV cross-linking followed by thermal and chemical treatments and subsequent drying. (See, e.g., Schena, M. et al. ( 1995) Science 270:467-470: Shalon, D. et al. ( 1996) Genome Res. 6:639-645.) Fluorescent probes are prepared and used for hybridization to the elements on the substrate. The substrate is analyzed by procedures described above. VIII. Complementary Polynucleotides Sequences complementary to the CKSR-encoding sequences, or any parts thereof, are used to detect, decrease, or inhibit expression of naturally occurring CKSR. Although use of oligonucleotides comprising from about 15 to 30 base pairs is described, essentially the same procedure is used with smaller or with larger sequence fragments. Appropriate oligonucleotides are designed using OLIGO 4.06 software (National Biosciences) and the coding sequence of CKSR. To inhibit transcription, a complementary oligonucleotide is designed from the most unique 5' sequence and used to prevent promoter binding to the coding sequence. To inhibit translation, a complementary oligonucleotide is designed to prevent ribosomal binding to the CKSR-encoding transcript. IX. Expression of CKSR Expression and purification of CKSR is achieved using bacterial or virus-based expression systems. For expression of CKSR in bacteria, cDNA is subcloned into an appropriate vector containing an antibiotic resistance gene and an inducible promoter that directs high levels of cDNA transcription. Examples of such promoters include, but are not limited to, the trp-lac (tac) hybrid promoter and the T5 or T7 bacteriophage promoter in conjunction with the lac operator regulatory element. Recombinant vectors are transformed into suitable bacterial hosts, e.g.. BL21 (DE3). Antibiotic resistant bacteria express CKSR upon induction with isopropyl beta-D- thiogalactopyranoside (IPTG). Expression of CKSR in eukaryotic cells is achieved by infecting insect or mammalian cell lines with recombinant Autographica californica nuclear polyhedrosis virus (AcMNPV), commonly known as baculovirus. The nonessential polyhedrin gene of baculovirus is replaced with cDNA encoding CKSR by either homologous recombination or bacterial-mediated transposition involving transfer plasmid intermediates. Viral infectivity is maintained and the strong polyhedrin promoter drives high levels of cDNA transcription. Recombinant baculovirus is used to infect Spodoptera frugiperda (Sf9) insect cells in most cases, or human hepatocytes, in some cases. Infection ofthe latter requires additional genetic modifications to baculovirus. (See Engelhard, E.K. et al. ( 1994) Proc. Natl. Acad. Sci. USA 91 :3224-3227; Sandig, V. et al. ( 1996) Hum. Gene Ther. 7: 1937- 1945.) In most expression systems, CKSR is synthesized as a fusion protein with, e.g., glutathione S-transferase (GST) or a peptide epitope tag, such as FLAG or 6-His, permitting rapid, single-step, affinity-based purification of recombinant fusion protein from crude cell lysates. GST, a 26- kilodalton enzyme from Schistosoma iaponicum, enables the purification of fusion proteins on immobilized glutathione under conditions that maintain protein activity and antigenicity (Amersham Pharmacia Biotech). Following purification, the GST moiety can be proteolytically cleaved from CKSR at specifically engineered sites. FLAG, an 8-amino acid peptide. enables immunoaffinity purification using commercially available monoclonal and polyclonal anti-FLAG antibodies (Eastman Kodak). 6-His. a stretch of six consecutive histidine residues, enables purification on metal-chelate resins (QIAGEN). Methods for protein expression and purification are discussed in Ausubel ( 1995, supra, ch. 10 and 16). Purified CKSR obtained by these methods can be used directly in the following activity assay. X. Demonstration of CKSR Activity CKSR activity may be measured by the induction of growth arrest when CKSR is expressed at physiologically elevated levels in transformed mammalian cell lines. CKSR cDNA is subcloned into a mammalian expression vector containing a strong promoter that drives high levels of cDNA expression, and these constructs are stably transfected into a transformed cell line, such as NIH 3T6 or C6, using methods known in the art. An additional plasmid, containing sequences which encode a selectable marker, such as hygromycin resistance, are co-transfected. Expression of a marker protein provides a means to distinguish transfected cells from nontransfected cells and is a reliable predictor of cDNA expression from the recombinant vector. Cells expressing CKSR are compared with control cells, either non-transfected or transfected with vector alone, for characteristics associated with growth arrest. Such characteristics can include, but are not limited to, a reduction in [ 3 H]-thymidine incoφoration into newly synthesized DNA, lower doubling and generation times, and decreased culture saturation density. The amount of growth arrest measured is proportional to the activity of CKSR. XI. Functional Assays CKSR function is assessed by expressing the sequences encoding CKSR at physiologically elevated levels in mammalian cell culture systems. cDNA is subcloned into a mammalian expression vector containing a strong promoter that drives high levels of cDNA expression. Vectors of choice include pCMV SPORT (Life Technologies) and pCR3.1 (Invitrogen, Carlsbad CA), both of which contain the cytomegalovirus promoter. 5-10 μg of recombinant vector are transiently transfected into a human cell line, for example, an endothelial or hematopoietic cell line, using either liposome formulations or electroporation. 1-2 μg of an additional plasmid containing sequences encoding a marker protein are co-transfected. Expression of a marker protein provides a means to distinguish transfected cells from nontransfected cells and is a reliable predictor of cDNA expression from the recombinant vector. Marker proteins of choice include, e.g.. Green Fluorescent Protein (GFP; Clontech), CD64. or a CD64-GFP fusion protein. Flow cytometry (FCM), an automated, laser optics- based technique, is used to identify transfected cells expressing GFP or CD64-GFP and to evaluate the apoptotic state of the cells and other cellular properties. FCM detects and quantifies the uptake of fluorescent molecules that diagnose events preceding or coincident with cell death. These events include changes in nuclear DNA content as measured by staining of DNA with propidium iodide; changes in cell size and granularity as measured by forward light scatter and 90 degree side light scatter; down-regulation of DNA synthesis as measured by decrease in bromodeoxyuridine uptake; alterations in expression of cell surface and intracellular proteins as measured by reactivity with specific antibodies; and alterations in plasma membrane composition as measured by the binding of fluorescein-conjugated Annexin V protein to the cell surface. Methods in flow cytometry are discussed in Ormerod, M.G. ( 1994) Flow Cvtometrv. Oxford. New York NY. The influence of CKSR on gene expression can be assessed using highly purified populations of cells transfected with sequences encoding CKSR and either CD64 or CD64-GFP. CD64 and CD64-GFP are expressed on the surface of transfected cells and bind to conserved regions of human immunoglobulin G (IgG). Transfected cells are efficiently separated from nontransfected cells using magnetic beads coated with either human IgG or antibody against CD64 (DYNAL, Lake Success NY). mRNA can be purified from the cells using methods well known by those of skill in the art. Expression of mRNA encoding CKSR and other genes of interest can be analyzed by northern analysis or microarray techniques. XII. Production of CKSR Specific Antibodies CKSR substantially purified using polyacrylamide gel electrophoresis (PAGE; see, e.g., Harrington, M.G. ( 1990) Methods Enzymol. 1 82:488-495), or other purification techniques, is used to immunize rabbits and to produce antibodies using standard protocols. Alternatively, the CKSR amino acid sequence is analyzed using LASERGENE software (DNASTAR) to determine regions of high immunogenicity, and a corresponding oligopeptide is synthesized and used to raise antibodies by means known to those of skill in the art. Methods for selection of appropriate epitopes. such as those near the C-terminus or in hydrophilic regions are well described in the art. (See, e.g., Ausubel, 1995, supra, ch. 1 1.) Typically, oligopeptides of about 15 residues in length are synthesized using an ABI 431 A peptide synthesizer (Perkin-Elmer) using fmoc-chemistry and coupled to KLH (Sigma-Aldrich, St. Louis MO) by reaction with N-maleimidobenzoyl-N-hydroxysuccinimide ester (MBS) to increase immunogenicity. (See, e.g., Ausubel, 1995, supra.) Rabbits are immunized with the oligopeptide- KLH complex in complete Freund's adjuvant. Resulting antisera are tested for antipeptide and anti- CKSR activity by, for example, binding the peptide or CKSR to a substrate, blocking with 1 % BSA, reacting with rabbit antisera. washing, and reacting with radio-iodinated goat anti-rabbit IgG. XIII. Purification of Naturally Occurring CKSR Using Specific Antibodies Naturally occurring or recombinant CKSR is substantially purified by immunoaffinity chromatography using antibodies specific for CKSR. An immunoaffinity column is constructed by covalently coupling anti-CKSR antibody to an activated chromatographic resin, such as CNBr-activated SEPHAROSE (Amersham Pharmacia Biotech). After the coupling, the resin is blocked and washed according to the manufacturer's instructions. Media containing CKSR are passed over the immunoaffinity column, and the column is washed under conditions that allow the preferential absorbance of CKSR (e.g.. high ionic strength buffers in the presence of detergent). The column is eluted under conditions that disrupt antibody/CKSR binding (e.g.. a buffer of pH 2 to pH 3. or a high concentration of a chaotrope, such as urea or thiocyanate ion), and CKSR is collected. XIV. Identification of Molecules Which Interact with CKSR CKSR, or biologically active fragments thereof, are labeled with l25 I Bolton-Hunter reagent. (See, e.g., Bolton A.E. and W.M. Hunter ( 1973) Biochem. J. 133:529-539.) Candidate molecules previously arrayed in the wells of a multi-well plate are incubated with the labeled CKSR, washed, and any wells with labeled CKSR complex are assayed. Data obtained using different concentrations of CKSR are used to calculate values for the number, affinity, and association of CKSR with the candidate molecules. Various modifications and variations of the described methods and systems of the invention will be apparent to those skilled in the art without departing from the scope and spirit of the invention. Although the invention has been described in connection with certain embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments. Indeed, various modifications of the described modes for carrying out the invention which are obvious to those skilled in molecular biology or related fields are intended to be within the scope of the following claims. Table 1 Program Description Reference Parameter Threshold ABI FACTURA A program that removes vector sequences and masks Perkin-Elmer Applied Biosj stems, ambiguous bases in nucleic acid sequences Foster City, CA ABl/PARACEL FDF A Fast Data Finder useful in comparing and annotating Perkin-Elmer Applied Biosystems, Mismatch <5()% amino acid or nucleic acid sequences Foster City, CA, Paracel Ine , Pasadena, CA ABI AutoAsseπiblcr A program that assembles nucleic acid sequences Perkin-Elmer Applied Biosystems, Foster Cilv . CA BLAST A Basic Local Alignment Search Tool useful in sequence Altschul, S F ct al (1990) J Mol Biol ESTs Probability \ aluc= 1 OE-8 or similarity search for amino acid and nucleic acid 215 403-410, Altschul, S F et al (1997) less sequences BLAST includes five functions blastp, blastn, Nucleic Acids Res 25 3389-3402 Full Length sequences Probabilit. b istx, tblastn. mid tblastx value= 1 OE-l or less FASTA A Pearson and Lipinan algorithm that searches for Pearson, W R and D J Lipinan (1 88) Proc ESls fasta E valuc=l 06E-6 similarity between a query sequence and a group of NaU Acad Sci 85.2444-2448, Pearson, W R Assembled ES'ls fasla Identi = sequences ofthe same type FASTA comprises as least (1990) Methods En/j mol 183 63-98, and 95% or greater and fi\ e functions fasta, tfasta, fastv tfaslv and sscarch Smith. T F and M S Waterman (1981) Ad\ Match lcngth=20() bases or greater, Appl Math 2 482-489 fastx E \ alue=l OE-8 or less Full Length sequences fastx scorc=l(K) or greater BLIMPS A BLocks IMProv ed Searcher that matches a sequence Henikoff, S and J G. Henikoff, Nucl Acid Score=l()(K) or greater. against those in BLOCKS, PRINTS, DOMO, PRODOM, Res , 1 6565-72, 1991 J G Henikoff and S Ratio of Score/Strength = 0 75 or and PFAM databases to search for gene families, sequence Henikoff (1996) Methods Enzymol 266:88- larger; and, if applicable, homology, and stnictural fingerprint regions 105, and Attvvood, T et al (1997) J Chem Probability value= 1 OE-3 or less Inf Coinput Sci 37 417-424 HMMER An algorithm for searching a query sequence against Krog , A et al (1994) J Mol Biol , Score= I0-5() bits for PFAM hits, hidden Markov model (HMM)-based databases of protein 235: 1501-1531, Sonnhan-iner, E L L et al. depending on individual protein family consensus sequences, such as PFAM (1988) Nucleic Acids Res 26 320-322 families Table 1 (cont.) Program Description Reference Parameter Threshold ProfilcScan An algorithm that searches for stnictural ;md sequence Gribskov. M et al ( 1 88) CABIOS 4 61 -66, Nonnali/ed quality score GCG- motifs in protein sequences dial match sequence patterns Gribsko\ , et al (1 89) Methods Enzymol spccified "HIGH \ aluc for that defined in Prosite 183 146-159, Bairoch, A et al (1997) particular Prosite motif Nucleic Acids Res 25 217-221 General!} . scorc=l 4-2 I Phrcd A base-calling algorithm that examines automated Ewing, B et al (1998) Genome sequencer traces with high sensitivity and probability Res 8 175-185, Ewing, B and P Green (1998) Genome Res 8 186- 194 Phrap A Phils Revised Assembly Program including SWAT and Sinidi, T F and M S Waterman (1981) Adv Score= 120 or greater, CrossMatch, programs based on efficient implementation Appl Maϋi 2 482-489, Smith, T F and M Match lengdι= 56 or greater l-n of the Smith- Waterman algorithm, useful in searching S Waterman (1981) J Mol Biol 147 195- sequence homology and assembling DNA sequences 197, and Green, P , Univ ersity of Washington. Seattle, WA Consed A graphical tool for \ iew uig and editing Phrap assemblies Gordon, D et l ( 1998) Genome Res 8 195-202 SPScan A vv eight matrix anal) sis program that scans protein Nielson, H et al (1997) Protein Engineering Score=3 5 or greater sequences for the presence of secretory signal peptides 10 1-6, ClaverieJ M and S Audic (1997) CABIOS 12 4 1-439 Motifs A program that searches amino acid sequences for patterns Bairoch et al supra. Wisconsin that matched those defined hi Prosite Package Program Manual, version 9, page M51-59, Genetics Computer Group, Madison, Wl

Claims: What is claimed is: 1 . A substantially purified polypeptide comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 1 -2 and fragments thereof. 2. A substantially purified variant having at least 90% amino acid sequence identity to the amino acid sequence of claim 1 . 3. An isolated and purified polynucleotide encoding the polypeptide of claim 1. 4. An isolated and purified polynucleotide variant having at least 70%> polynucleotide sequence identity to the polynucleotide of claim 3. 5. An isolated and purified polynucleotide which hybridizes under stringent conditions to the polynucleotide of claim 3. 6. An isolated and purified polynucleotide having a sequence which is complementary to the polynucleotide of claim 3. 7. A method for detecting a polynucleotide, the method comprising the steps of: (a) hybridizing the polynucleotide of claim 6 to at least one nucleic acid in a sample, thereby forming a hybridization complex; and (b) detecting the hybridization complex, wherein the presence ofthe hybridization complex correlates with the presence of the polynucleotide in the sample. 8. The method of claim 7 further comprising amplifying the polynucleotide prior to hybridization. 9. An isolated and purified polynucleotide comprising a polynucleotide sequence selected from the group consisting of SEQ ID NO:3-4 and fragments thereof. 10. An isolated and purified polynucleotide variant having at least 70% polynucleotide sequence identity to the polynucleotide of claim 9. 1 1 . An isolated and purified polynucleotide having a sequence which is complementary to the polynucleotide of claim 9. 12. An expression vector comprising at least a fragment of the polynucleotide of claim 3. 13. A host cell comprising the expression vector of claim 12. 14. A method for producing a polypeptide. the method comprising the steps of: a) culturing the host cell of claim 13 under conditions suitable for the expression of the polypeptide; and b) recovering the polypeptide from the host cell culture. 15. A pharmaceutical composition comprising the polypeptide of claim 1 in conjunction with a suitable pharmaceutical carrier. 16. A purified antibody which specifically binds to the polypeptide of claim 1. 17. A purified agonist of the polypeptide of claim 1. 18. A purified antagonist of the polypeptide of claim 1. 1 . A method for treating or preventing a disorder associated with decreased expression or activity of CKSR. the method comprising administering to a subject in need of such treatment an effective amount of the pharmaceutical composition of claim 15. 20. A method for treating or preventing a disorder associated with increased expression or activity of CKSR. the method comprising administering to a subject in need of such treatment an effective amount ofthe antagonist of claim 18. -.-.

Inventors: BAUGHN MARIAH R, CORLEY NEIL C, GUEGLER KARL J, YUE HENRY, BAUGHN, MARIAH, R., CORLEY, NEIL, C., GUEGLER, KARL, J., YUE, HENRY
Applicants: BAUGHN MARIAH R, CORLEY NEIL C, GUEGLER KARL J, INCYTE PHARMA INC, YUE HENRY, BAUGHN, MARIAH, R., CORLEY, NEIL, C., GUEGLER, KARL, J., INCYTE PHARMACEUTICALS, INC., YUE, HENRY
Application year: 1999
Main classification: C12N15
IPC codes: A61K38, A61K45, A61P43, C07K14, C07K16, C12N1, C12N5, C12N15, C12P21, C12Q1, G01N33