NUCLEAR HORMONE RECEPTORS

Abstract: The invention provides human nuclear hormone receptors (NHREC) and polynucleotides which identify and encode NHREC. The invention also provides expression vectors, host cells, antibodies, agonists, and antagonists. The invention also provides methods for diagnosing, treating or preventing disorders associated with aberrant expression of NHREC.

Description: NUCLEAR HORMONE RECEPTORS TECHNICAL FIELD This invention relates to nucleic acid and amino acid sequences of nuclear hormone receptors and to the use of these sequences in the diagnosis, treatment, and prevention of metabolic, endocrine, reproductive, developmental, immunological, and cell proliferative disorders, and in the assessment of the effects of exogenous compounds on the expression of nucleic acid and amino acid sequences of nuclear hormone receptors. BACKGROUND OF THE INVENTION The nuclear hormone receptors, also known as the nuclear receptors or the intracellular receptors, constitute a protein superfamily whose members are both receptors and transcriptional regulators. Nuclear hormone receptors rely on both their receptor function and their transcriptional regulatory function to affect a broad array of biological processes, including development, homeostasis, cell proliferation, and cell differentiation. (Reviewed in Mangelsdorf, D.J. et al. ( 1995) Cell 83:835-840; Wen, D.X. and D.P. McDonnell (1995) Curr. Opin. Biotechnol. 6:582-589; Perlmann, T. and R.M. Evans (1997) Cell 90:391-397; Tenbaum, S. and A. Baniahmad (1997) Int. J. Biochem. Cell Biol. 29: 1325-1341 ; Moras, D. and H. Gronemeyer (1998) Curr. Opin. Cell Biol. 10:384-391 ; Willy, P.J. and D.J. Mangelsdorf (1998) in: Hormones and Signaling (ed: B.W. O'Malley) vol. 1, Academic Press, San Diego CA, pp. 307-358; Weatherman, RN. et al. (1999) Annu. Rev. Biochem. 68:559-581.) Nuclear hormone receptors as receptors Generally, the term receptor describes a protein that specifically recognizes other molecules. As receptors, nuclear hormone receptors specifically recognize and bind to their cognate ligands. Although nuclear hormone receptors are located intracellularly, many receptors are extracellular cell surface proteins which bind extracellular ligands. Such extracellular receptors produce cellular responses affecting growth, differentiation, endocytosis, and the immune response. Other receptors facilitate the selective transport of proteins out of the endoplasmic reticulum and localize enzymes to particular regions of the cell. Transcriptional regulation by nuclear hormone receptors, propagation of cellular signals by extracellular receptors, and transport and localization of proteins by other receptors, all rely upon specific interactions between the receptors and a variety of cellular components. In many cases, the identity of the cognate ligand to which a receptor binds is unknown. Such receptors are termed orphan receptors. This term also applies to those nuclear hormone receptors which carry out their transcriptional regulatory functions without binding any ligands. Nuclear hormone receptors as transcriptional regulators Multicellular organisms are comprised of diverse cell types that differ dramatically both in structure and function. The identity of a cell is determined by its characteristic pattern of gene expression, and different cell types express overlapping but distinctive sets of genes throughout development. Spatial and temporal regulation of gene expression is critical for the control of cell proliferation, cell differentiation, apoptosis, and other processes that contribute to organismal development. As transcriptional regulators, nuclear hormone receptors play key roles in controlling these fundamental biological processes. Other transcriptional regulators affect gene expression in response to extracellular signals that mediate cell-cell communication and that coordinate the activities of different cell types. In general, transcriptional regulators such as nuclear hormone receptors initiate, activate, repress, or terminate gene transcription by binding to the promoter, enhancer, and upstream regulatory regions of a gene in a sequence-specific manner. However, some transcriptional regulators bind regulatory elements within or downstream of a gene's coding region. Transcriptional regulatory proteins may bind to a specific region of DNA singly, or in a complex with other accessory factors. (Reviewed in Lewin, B. (1990) in: Genes IV, Oxford University Press, New York NY, and Cell Press, Cambridge MA, pp. 554-570.) Mechanism of nuclear hormone receptor function In the unliganded state, a nuclear hormone receptor exists in association with a multiprotein complex of chaperones, including heat shock proteins such as hsp90 and immunophilins such as hsp56. These chaperones maintain the ligand-free receptor in an inactive state which is amenable to binding of free ligand, and prevent the ligand-free receptor from translocating to the nucleus. Upon activation by its cognate ligand, the receptor may form a homodimer or heterodimer which translocates to the nucleus, binds to specific DNA sequences, and exerts its transcriptional regulatory function. In order to effectively carry out its regulatory roles, an activated nuclear hormone receptor dissociates from a histone deacetylase-containing corepressor complex and associates with a histone acetyltransferase-containing coactivator complex (Xu, L. et al. (1999) Curr. Opin. Genet. Dev. 9:140- 147). The association of the activated receptor with coactivator proteins results in remodeling of chromatin so that it adopts an open transcriptionally active state, providing access to the transcriptional regulatory elements of the activated nuclear receptor (Lemon, B.D. and L.P. Freedman (1999) Curr. Opin. Genet. Dev. 9:499-504). Structure of nuclear hormone receptors Nuclear hormone receptors function as signal transducers by converting hormonal signals into transcriptional responses. In general, nuclear hormone receptors consist of a variable amino- terminal domain, a highly conserved DNA-binding domain, and a conserved C-terminal ligand- binding domain. In the steroid-binding nuclear hormone receptors, the amino-terminal domain harbors a trans-activation element termed AF-1. Some nuclear hormone receptors also contain a trans-activation element in the ligand-binding domain termed AF-2. The DNA-binding and ligand- binding domains of nuclear hormone receptors may contain dimerization elements, and the DNA- binding domain may contain a nuclear localization signal (Weatherman, RN. et al. (1999) Annu. Rev. Biochem. 68:559-581). The DΝA-binding domain of nuclear hormone receptors is composed of two zinc finger motifs which mediate recognition of specific DΝA sequences. A zinc finger motif contains periodically spaced cysteine and histidine residues which coordinate Zn +2 . Examples of this sequence pattern include the C2H2-type, C4-type, and C3HC4-type ("RING" finger) zinc fingers, and the PHD domain (Lewin, supra; Aasland, R. et al. (1995) Trends Biochem. Sci. 20:56-59). A zinc finger motif contains an α helix and an antiparallel β sheet whose proximity and conformation are maintained by the zinc ion. Contact with DNA is made by the arginine preceding the α helix and by the second, third, and sixth residues of the α helix. Zinc finger motifs may be repeated in a tandem array within a protein such that the a helix of each zinc finger in the protein makes contact with the major groove of the DNA double helix. This repeated contact between the protein and the DNA produces a strong and specific DNA-protein interaction. The strength and specificity of the interaction can be regulated by the number of zinc finger motifs within the protein. Although zinc fingers were originally identified in DNA-binding proteins as regions that interact directly with DNA, they have since been found in proteins that do not bind to DNA. (See, e.g., Lodish, H. et al. (1995) Molecular Cell Biology, Scientific American Books, New York NY, pp. 447-451.) The ligand-binding domain of nuclear hormone receptors is responsible for binding to ligands, coactivator proteins, and corepressor proteins. This domain is composed of three layers of α helices, with the central layer consisting of two helices containing many hydrophobic side chains (Moras, D. and H. Gronemeyer (1998) Curr. Opin. Cell Biol. 10:384-391). These two central α helices thus create a hydrophobic pocket which is the site of ligand binding. A ligand bound in this hydrophobic ligand-binding site is completely buried inside the receptor protein and is not exposed to solvent. This suggests that large conformational changes in the ligand-binding domain would accompany binding of a ligand. One of the α helices of the ligand-binding domain provides many of the inter-subunit contacts in dimers of nuclear receptors. This α helix contacts the ligand when it is bound in the ligand-binding pocket, suggesting that ligand binding can affect formation of receptor dimers (Weatherman, RN. et al. (1999) Annu. Rev. Biochem. 68:559-581). Classes of nuclear hormone receptors Nuclear hormone receptors can be grouped into three broad classes: the steroid receptors, the RXR-heterodimeric receptors, and the orphan nuclear hormone receptors. The steroid receptors bind to steroid hormones, and this class includes the androgen receptor, mineralocorticoid receptor, estrogen receptor, glucocorticoid receptor, and progesterone receptor The RXR-heterodimeπc receptors bind to nonsteroid ligands, and this class includes the thyroid hormone receptor, retinoic acid receptor, vitamin D receptor, ecdysone receptor, and peroxisome proliferator activated receptor The orphan nuclear hormone receptors include steroidogenic factor 1 , nerve growth factor-induced receptor, and X-hnked orphan receptor DAX-1 The steroid hormone receptors are activated upon binding to specific steroid hormones The conformational change induced by ligand binding leads to dissociation of the receptor from heat shock proteins and formation of receptor homodimers which recognize specific pahndromic DNA sequences called hormone response elements (HREs) Upon binding to an HRE, a steroid hormone receptor homodimer can regulate the transcription of target genes For example, the progesterone receptor (PR) is a steroid hormone receptor which is activated by progesterone, a 4-pregnene-3,20-dιone derived from cholesterol which is a critical oscillating component of the female reproductive cycle These oscillations correlate with anatomical and morphological changes including menstruation and pregnancy The activities of progesterone are mediated through PR In the cytoplasm, PR associates with several other proteins and factors known as the PR heterocomplex This heterocomplex includes heat shock proteins and immunophilins such as hsp70, hsp90, hsp27, p59 (hsp56), p48, and p23 (Johnson, J L et al (1994) Moi Cell Biol 14 1956-1963) Upon binding progesterone, activated PR translocates to the nucleus, binds to canonical DNA transcriptional elements, and regulates progesterone-regulated genes implicated in differentiation and the cell cycle (Moutsatsou, P and C E Sekeπs (1997) Ann N Y Acad Sci 816 99-115) The PR antagonist RU 486, which can be used to terminate a pregnancy, is an example of a commercial therapeutic targeted toward a steroid hormone receptor The RXR-heterodimeπc nuclear receptors are distinguished from the steroid hormone receptors in that members of the former group bind to their target DNA sequences upon formation of heterodimers with retinoid X receptors (RXRs) (Mangelsdorf, D J and R M Evans (1995) Cell 83 841-850) Three different isoforms of RXR have been identified (Minucci, S and K Ozato (1996) Curr Opin Genet Dev 6 567-574) The retinoic acid receptors (RARs) are examples of RXR-heterodimeric nuclear receptors Retinoic acid (RA) is a biologically active metabolite of vitamin A (retinol), a fat-soluble vitamin found mainly in fish liver oils, liver, egg yolk, butter, and cream While 9-cιs-RA binds to RARs and RXRs, all-trans-RA binds only to RXRs RAR/RXR heterodimers bind with high affinity to specific DNA sequences known as retinoic acid response elements (RAREs), thus acting as regulators of RA-dependent transcription Peroxisome proliferator activated receptors (PPARs) are therapeutically important RXR- heterodimeπc nuclear receptors which are induced by fatty acids and eicosanoids There are three known isotypes of PPAR, each with specific expression patterns, and these PPARs are involved in the regulation of genes involved in systemic homeostatis of glucose and lipids (Khewer, S.A. and T.M. Willson ( 1998) Curr Opin. Genet. Dev. 8:576-581 ; Micha k, L. and W. Wahh (1999) Curr. Opin. Biotechnol. 10:564-570). As such, PPARs are therapeutic targets for disorders such as diabetes, dyslipidemia, and obesity (Smith, S.A. (1996) Pharmacol. Rev Commun. 8'57-64; Willson, T.M. and W. Wahh (1997) Curr. Opin. Chem. Biol. 1 :235-241 ; Barroso, I. et al. (1999) Nature 402.880-883) The orphan nuclear receptors either have no known activating ligand, or can exert their transcriptional regulatory activities without benefit of ligand binding. For example, in Caenorhabditis elegans, the X-chromosome encoded nuclear hormone receptor homologue SEX-1 regulates transcription of the sex determination gene xol-1 (Carmi, I. et al. (1998) Nature 396: 168-173) Rather than relying on ligand binding, SEX-1 acts as a transcriptional regulator in a dose-dependent manner, in effect controlling sexual differentiation through an X-chromosome-counting mechanism. Some nuclear hormone receptors lack the conventional DNA-binding domain typically associated with the nuclear hormone receptor family. DAX-1 is one such nuclear hormone receptor lacking the conventional DNA-binding domain, and mutations in DAX-1 have been shown to cause X-linked adrenal hypoplasia congemta (Zanaπa, E.F. et al (1994) Nature 372:635-641). DAX-1 is an orphan nuclear receptor which interacts directly with steroidogenic factor 1 (SF-1) (Ito, M. et al. (1997) Moi. Cell. Biol. 17: 1476-1483), and DAX-1 is capable of modulating the action of SF-1 in sex-specific gene expression (Nachtigal, M.W. et al. (1998) Cell 445-454). SF-1 is an orphan nuclear receptor which acts as a transcπption factor for several steroidogenic enzyme genes in the adrenal gland and gonads (Lala, D.S. et al. (1992) Moi. Endocπnol. 6: 1249-1258; Lynch, J.P. et al. (1993) Moi. Endocπnol. 7.776-786, Clemens, J.W. et al. (1994) Endocrinology 134.1499-1508), and can also regulate several genes expressed in pituitary gonadotrope cells (Barnhart, K.M. and P.L Mellon (1994) Moi. Endocπnol 8.878-885; Ingraham, H.A. et al. (1994) Genes Dev. 8.2302-2312; Halvorson, L.M. et al. (1996) J. Biol. Chem. 271 :6645-6650, Ken, R.A. and J.H. Nilson (1996) J. Biol. Chem. 271 : 10782-10785). SF-1 also acts as a potent transactivator of small heterodimer partner (SHP, short heterodimer partner) (Lee, Y.K. et al. (1999) J Biol. Chem. 274:20869-20873). SHP is another example of a nuclear hormone receptor lacking the conventional DNA-binding domain (Seol, W. et al. ( 1996) Science 272: 1336-1339; Lee, H.-K. et al. (1998) J. Biol. Chem. 273: 14398-14402). SHP interacts with many members of the nuclear hormone receptor family, including retinoid receptors, estrogen receptor, thyroid hormone receptor, and the orphan receptor CAR. SHP acts as an inhibitor of estrogen receptor-mediated transcriptional activation by competing with coactivators for binding to estrogen receptor (Johansson, L. et al. (1999) J. Biol. Chem. 274-345-353). SHP also inhibits transactivation by the orphan receptor hepatocyte nuclear factor 4, and by retinoid X receptor (Lee, Y.K. et al. (2000) Moi. Cell. Biol. 20:187-195). Consequences of defective transcription regulation Many neoplastic disorders in humans can be attributed to inappropriate gene expression. Malignant cell growth may result from either excessive expression of tumor promoting genes or insufficient expression of tumor suppressor genes (Cleary, M.L. (1992) Cancer Surv. 15:89-104). Chromosomal translocations may also produce chimeric loci which fuse the coding sequence of one gene with the regulatory regions of a second unrelated gene. Such an arrangement likely results in inappropriate gene transcription, potentially contributing to malignancy. In addition, the immune system responds to infection or trauma by activating a cascade of events that coordinate the progressive selection, amplification, and mobilization of cellular defense mechanisms. A complex and balanced program of gene activation and repression is involved in this process. However, hyperactivity of the immune system as a result of improper or insufficient regulation of gene expression may result in considerable tissue or organ damage. This damage is well documented in immunological responses associated with arthritis, allergens, heart attack, stroke, and infections. (See, e.g., Isselbacher et al. (1996) Harrison's Principles of Internal Medicine, 13/e, McGraw Hill, Inc. and Teton Data Systems Software.) Furthermore, the growth of multicellular organisms is based upon the induction and coordination of cell differentiation at the appropriate stages of development. Central to this process is differential gene expression, which confers the distinct identities of cells and tissues throughout the body. Failure to regulate gene expression during development could result in developmental disorders. The discovery of new nuclear hormone receptors 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 metabolic, endocrine, reproductive, developmental, immunological, and cell proliferative disorders, and in the assessment of the effects of exogenous compounds on the expression of nucleic acid and amino acid sequences of nuclear hormone receptors. SUMMARY OF THE INVENTION The invention features purified polypeptides, nuclear hormone receptors, referred to collectively as "NHREC" and individually as "NHREC- 1 ," "NHREC-2,"and "NHREC-3." In one aspect, the invention provides an isolated polypeptide comprising an amino acid sequence selected from the group consisting of a) an amino acid sequence selected from the group consisting of SEQ ID NO: 1-3, b) a naturally occurring amino acid sequence having at least 90% sequence identity to an amino acid sequence selected from the group consisting of SEQ ID NO: 1-3, c) a biologically active fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, and d) an immunogenic fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3 In one alternative, the invention provides an isolated polypeptide comprising the amino acid sequence of SEQ ID NO 1-3 The invention further provides an isolated polynucleotide encoding a polypeptide comprising an amino acid sequence selected from the group consisting of a) an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, b) a naturally occumng amino acid sequence having at least 90% sequence identity to an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, c) a biologically active fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, and d) an immunogenic fragment of an am o acid sequence selected from the group consisting of SEQ ID NO 1-3 In one alternative, the polynucleotide encodes a polypeptide selected from the group consisting of SEQ ID NO 1-3 In another alternative, the polynucleotide is selected from the group consisting of SEQ ID NO 4-6 Additionally, the invention provides a recombinant polynucleotide compπsing a promoter sequence operably linked to a polynucleotide encoding a polypeptide comprising an amino acid sequence selected from the group consisting of a) an ammo acid sequence selected from the group consisting of SEQ ID NO 1-3, b) a naturally occurring amino acid sequence having at least 90% sequence identity to an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, c) a biologically active fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, and d) an immunogenic fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3 In one alternative, the invention provides a cell transformed with the recombinant polynucleotide In another alternative, the invention provides a transgenic organism comprising the recombinant polynucleotide The invention also provides a method for producing a polypeptide compπsing an amino acid sequence selected from the group consisting of a) an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, b) a naturally occumng amino acid sequence having at least 90% sequence identity to an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, c) a biologically active fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, and d) an immunogenic fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3 The method comprises a) culturing a cell under conditions suitable for expression of the polypeptide, wherein said cell is transformed with a recombinant polynucleotide compπsing a promoter sequence operably linked to a polynucleotide encoding the polypeptide, and b) recovering the polypeptide so expressed Additionally, the invention provides an isolated antibody which specifically binds to a polypeptide comprising an am o acid sequence selected from the group consisting of a) an amino acid sequence selected from the group consisting of SEQ ID NO: 1-3, b) a naturally occurring amino acid sequence having at least 90% sequence identity to an amino acid sequence selected from the group consisting of SEQ ID NO: 1-3, c) a biologically active fragment of an amino acid sequence selected from the group consisting of SEQ ID NO: 1 -3, and d) an immunogenic fragment of an amino acid sequence selected from the group consisting of SEQ ID NO: 1 -3. The invention further provides an isolated polynucleotide comprising a polynucleotide sequence selected from the group consisting of a) a polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6, b) a naturally occuπing polynucleotide sequence having at least 90% sequence identity to a polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6, c) a polynucleotide sequence complementary to a), d) a polynucleotide sequence complementary to b), and e) an RNA equivalent of a)-d). In one alternative, the polynucleotide comprises at least 60 contiguous nucleotides. Additionally, the invention provides a method for detecting a target polynucleotide in a sample, said target polynucleotide having a sequence of a polynucleotide comprising a polynucleotide sequence selected from the group consisting of a) a polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6, b) a naturally occuπing polynucleotide sequence having at least 90% sequence identity to a polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6, c) a polynucleotide sequence complementary to a), d) a polynucleotide sequence complementary to b), and e) an RNA equivalent of a)-d). The method comprises a) hybridizing the sample with a probe comprising at least 20 contiguous nucleotides comprising a sequence complementary to said target polynucleotide in the sample, and which probe specifically hybridizes to said target polynucleotide, under conditions whereby a hybridization complex is formed between said probe and said target polynucleotide or fragments thereof, and b) detecting the presence or absence of said hybridization complex, and optionally, if present, the amount thereof. In one alternative, the probe comprises at least 60 contiguous nucleotides. The invention further provides a method for detecting a target polynucleotide in a sample, said target polynucleotide having a sequence of a polynucleotide comprising a polynucleotide sequence selected from the group consisting of a) a polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6, b) a naturally occuπing polynucleotide sequence having at least 90% sequence identity to a polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6, c) a polynucleotide sequence complementary to a), d) a polynucleotide sequence complementary to b), and e) an RNA equivalent of a)-d). The method comprises a) amplifying said target polynucleotide or fragment thereof using polymerase chain reaction amplification, and b) detecting the presence or absence of said amplified target polynucleotide or fragment thereof, and, optionally, if present, the amount thereof. The invention further provides a composition compπsing an effective amount of a polypeptide comprising an amino acid sequence selected from the group consisting of a) an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, b) a naturally occurring amino acid sequence having at least 90% sequence identity to an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, c) a biologically active fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, and d) an immunogenic fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, and a pharmaceutically acceptable excipient In one embodiment, the composition comprises an amino acid sequence selected from the group consisting of SEQ ID NO 1-3 The invention additionally provides a method of treating a disease or condition associated with decreased expression of functional NHREC, comprising administering to a patient in need of such treatment the composition The invention also provides a method for screening a compound for effectiveness as an agonist of a polypeptide comprising an amino acid sequence selected from the group consisting of a) an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, b) a naturally occurring amino acid sequence having at least 90% sequence identity to an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, c) a biologically active fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, and d) an immunogenic fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3 The method compπses a) exposing a sample compπsing the polypeptide to a compound, and b) detecting agonist activity in the sample In one alternative, the invention provides a composition comprising an agonist compound identified by the method and a pharmaceutically acceptable excipient In another alternative, the invention provides a method of treating a disease or condition associated with decreased expression of functional NHREC, compπsing administering to a patient in need of such treatment the composition Additionally, the invention provides a method for screening a compound for effectiveness as an antagonist of a polypeptide comprising an amino acid sequence selected from the group consisting of a) an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, b) a naturally occurring amino acid sequence having at least 90% sequence identity to an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, c) a biologically active fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, and d) an immunogenic fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3 The method comprises a) exposing a sample comprising the polypeptide to a compound, and b) detecting antagonist activity in the sample In one alternative, the invention provides a composition comprising an antagonist compound identified by the method and a pharmaceutically acceptable excipient In another alternative, the invention provides a method of treating a disease or condition associated with overexpression of functional NHREC, comprising administering to a patient in need of such treatment the composition. The invention further provides a method of screening for a compound that specifically binds to a polypeptide comprising an amino acid sequence selected from the group consisting of a) an amino acid sequence selected from the group consisting of SEQ ID NO: 1-3, b) a naturally occurring amino acid sequence having at least 90% sequence identity to an amino acid sequence selected from the group consisting of SEQ ID NO: 1-3, c) a biologically active fragment of an amino acid sequence selected from the group consisting of SEQ ID NO: 1-3, and d) an immunogenic fragment of an amino acid sequence selected from the group consisting of SEQ ID NO: 1-3. The method comprises a) combining the polypeptide with at least one test compound under suitable conditions, and b) detecting binding of the polypeptide to the test compound, thereby identifying a compound that specifically binds to the polypeptide. The invention further provides a method of screening for a compound that modulates the activity of a polypeptide comprising an amino acid sequence selected from the group consisting of a) an amino acid sequence selected from the group consisting of SEQ ID NO: 1-3, b) a naturally occuπing amino acid sequence having at least 90% sequence identity to an amino acid sequence selected from the group consisting of SEQ ID NO: 1 -3, c) a biologically active fragment of an amino acid sequence selected from the group consisting of SEQ ID NO: 1-3, and d) an immunogenic fragment of an amino acid sequence selected from the group consisting of SEQ ID NO: 1-3. The method comprises a) combining the polypeptide with at least one test compound under conditions permissive for the activity of the polypeptide, b) assessing the activity of the polypeptide in the presence of the test compound, and c) comparing the activity of the polypeptide in the presence of the test compound with the activity of the polypeptide in the absence of the test compound, wherein a change in the activity of the polypeptide in the presence of the test compound is indicative of a compound that modulates the activity of the polypeptide. The invention further provides a method for screening a compound for effectiveness in altering expression of a target polynucleotide, wherein said target polynucleotide comprises a sequence selected from the group consisting of SEQ ID NO:4-6, the method comprising a) exposing a sample comprising the target polynucleotide to a compound, and b) detecting altered expression of the target polynucleotide. The invention further provides a method for assessing toxicity of a test compound, said method comprising a) treating a biological sample containing nucleic acids with the test compound; b) hybridizing the nucleic acids of the treated biological sample with a probe comprising at least 20 contiguous nucleotides of a polynucleotide comprising a polynucleotide sequence selected from the group consisting of i) a polynucleotide sequence selected from the group consisting of SEQ ID NO:4- 6, ii) a naturally occurring polynucleotide sequence having at least 90% sequence identity to a polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6, iii) a polynucleotide sequence complementary to i), iv) a polynucleotide sequence complementary to ii), and v) an RNA equivalent of i)-iv). Hybridization occurs under conditions whereby a specific hybridization complex is formed between said probe and a target polynucleotide in the biological sample, said target polynucleotide comprising a polynucleotide sequence selected from the group consisting of i) a polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6, ii) a naturally occurring polynucleotide sequence having at least 90% sequence identity to a polynucleotide sequence selected from the group consisting of SEQ ID NO:4-6, iii) a polynucleotide sequence complementary to i), iv) a polynucleotide sequence complementary to ii), and v) an RNA equivalent of i)-iv). Alternatively, the target polynucleotide comprises a fragment of a polynucleotide sequence selected from the group consisting of i)-v) above; c) quantifying the amount of hybridization complex; and d) comparing the amount of hybridization complex in the treated biological sample with the amount of hybridization complex in an untreated biological sample, wherein a difference in the amount of hybridization complex in the treated biological sample is indicative of toxicity of the test compound. BRIEF DESCRIPTION OF THE TABLES Table 1 summarizes the nomenclature for the full length polynucleotide and polypeptide sequences of the present invention. Table 2 shows the GenBank identification number and annotation of the nearest GenBank homolog for polypeptides of the invention. The probability score for the match between each polypeptide and its GenBank homolog is also shown. Table 3 shows structural features of polypeptide sequences of the invention, including predicted motifs and domains, along with the methods, algorithms, and searchable databases used for analysis of the polypeptides. Table 4 lists the cDNA and genomic DNA fragments which were used to assemble polynucleotide sequences of the invention, along with selected fragments of the polynucleotide sequences. Table 5 shows the representative cDNA library for polynucleotides of the invention. Table 6 provides an appendix which describes the tissues and vectors used for construction of the cDNA libraries shown in Table 5. Table 7 shows the tools, programs, and algorithms used to analyze the polynucleotides and polypeptides of the invention, 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 prefeπed 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 "NHREC" refers to the amino acid sequences of substantially purified NHREC 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 NHREC. Agonists may include proteins, nucleic acids, carbohydrates, small molecules, or any other compound or composition which modulates the activity of NHREC either by directly interacting with NHREC or by acting on components of the biological pathway in which NHREC participates. An "allelic variant" is an alternative form of the gene encoding NHREC. Allelic variants may result from at least one mutation in the nucleic acid sequence and may result in altered RNAs 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 occuπing 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 NHREC include those sequences with deletions, insertions, or substitutions of different nucleotides, resulting in a polypeptide the same as NHREC or a polypeptide with at least one functional characteristic of NHREC Included within this definition are polymorphisms which may or may not be readily detectable using a particular oligonucleotide probe of the polynucleotide encoding NHREC, and improper or unexpected hybridization to allelic variants, with a locus other than the normal chromosomal locus for the polynucleotide sequence encoding NHREC 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 NHREC 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 NHREC is retained For example, negatively charged amino acids may include aspartic acid and glutamic acid, and positively charged ammo acids may include lysine and arginme Amino acids with uncharged polar side chains having similar hydrophilicity values may include asparagine and glutamine, and seπne 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 ohgopeptide, peptide, polypeptide, or protein sequence, or a fragment of any of these, and to naturally occuπing or synthetic molecules Where "amino acid sequence" is recited to refer to a sequence of a naturally occuπing protein molecule, "am o 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 caπied 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 NHREC Antagonists may include proteins such as antibodies, nucleic acids, carbohydrates, small molecules, or any other compound or composition which modulates the activity of NHREC either by directly interacting with NHREC or by acting on components of the biological pathway in which NHREC participates The term "antibody" refers to intact immunoglobulin molecules as well as to fragments thereof, such as Fab, F(ab') 2 , and Fv fragments, which are capable of binding an epitopic determinant Antibodies that bind NHREC polypeptides can be prepared using intact polypeptides or using fragments containing small peptides of interest as the immunizing antigen The polypeptide or ohgopeptide used to immunize an animal (e g , a mouse, a rat, or a rabbit) can be denved from the translation of RNA, or synthesized chemically, and can be conjugated to a carrier protein if desired Commonly used caπiers that are chemically coupled to peptides include bovine serum albumin thyroglobuhn, 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 (1 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 (1 e , the immunogen used to elicit the immune response) for binding to an antibody The term "antisense" refers to any composition capable of base-pairing with the "sense" (coding) strand of a specific nucleic acid sequence Antisense compositions may include DNA RNA, peptide nucleic acid (PNA), oligonucleotides having modified backbone linkages such as phosphorothioates, methylphosphonates, or benzylphosphonates, oligonucleotides having modified sugar groups such as 2'-methoxyethyl sugars or 2'-methoxyethoxy sugars, or oligonucleotides having modified bases such as 5-methyl cytosine, 2'-deoxyuracιl, or 7-deaza-2'-deoxyguanosme Antisense molecules may be produced by any method including chemical synthesis or transcription Once introduced into a cell, the complementary antisense molecule base-pairs with a naturally occurring nucleic acid sequence produced by the cell to form duplexes which 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 of a reference DNA molecule The term "biologically active" refers to a protein having structural, regulatory, or biochemical functions of a naturally occuπing molecule Likewise, "immunologically active" or "immunogenic" refers to the capability of the natural, recombinant, or synthetic NHREC, or of any ohgopeptide thereof, to induce a specific immune response in appropriate animals or cells and to bind with specific antibodies "Complementary" describes the relationship between two single-stranded nucleic acid sequences that anneal by base-pairing For example, 5'-AGT-3' pairs with its complement, 3'-TCA-5' 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 NHREC or fragments of NHREC may be employed as hybridization probes The probes may be stored in freeze-dπed 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 subjected to repeated DNA sequence analysis to resolve uncalled bases, extended using the XL-PCR kit (Applied Biosystems, Foster City CA) in the 5' and/or the 3' direction, and resequenced, or which has been assembled from one or more overlapping cDNA, EST, or genomic DNA fragments using a computer program for fragment assembly, such as the GELVTEW fragment assembly system (GCG, Madison WI) or Phrap (University of Washington, Seattle WA). Some sequences have been both extended and assembled to produce the consensus sequence. "Conservative amino acid substitutions" are those substitutions that are predicted to 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 which 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 His Asn, Arg, Gin, Glu He Leu, Val 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 a chemically modified polynucleotide or polypeptide. Chemical modifications of a polynucleotide 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 "detectable label" refers to a reporter molecule or enzyme that is capable of generating a measurable signal and is covalently or noncovalently joined to a polynucleotide or polypeptide. A "fragment" is a unique portion of NHREC or the polynucleotide encoding NHREC 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, 16, 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:4-6 comprises a region of unique polynucleotide sequence that specifically identifies SEQ ID NO:4-6, for example, as distinct from any other sequence in the genome from which the fragment was obtained. A fragment of SEQ ID NO:4-6 is useful, for example, in hybridization and amplification technologies and in analogous methods that distinguish SEQ ID NO:4-6 from related polynucleotide sequences. The precise length of a fragment of SEQ ID NO:4-6 and the region of SEQ ID NO:4-6 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: 1-3 is encoded by a fragment of SEQ ID NO:4-6. A fragment of SEQ ID NO: 1-3 comprises a region of unique amino acid sequence that specifically identifies SEQ ID NO: 1-3. For example, a fragment of SEQ ID NO: 1-3 is useful as an immunogenic peptide for the development of antibodies that specifically recognize SEQ ID NO: 1-3. The precise length of a fragment of SEQ ID NO: 1-3 and the region of SEQ ID NO: 1-3 to which the fragment coπesponds are routinely determinable by one of ordinary skill in the art based on the intended purpose for the fragment. A "full length" polynucleotide sequence is one containing at least a translation initiation codon (e.g., methionine) followed by an open reading frame and a translation termination codon. A "full length" polynucleotide sequence encodes a "full length" polypeptide sequence. "Homology" refers to sequence similarity or, interchangeably, sequence identity, between two or more polynucleotide sequences or two or more polypeptide sequences. The terms "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 incoφorated 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 WI). 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 sequences. 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, S.F. et al. (1990) J. Moi. 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://www.ncbi.nlm.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 2.0.12 (April-21-2000) set at default parameters. Such default parameters may be, for example: Matrix: BLOSUM62 Reward for match: 1 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 least 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 charge and iydrophobicity 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 MEG ALIGN 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 2.0.12 (April-21-2000) 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 chromosome replication, segregation and maintenance The term "humanized antibody" refers to an antibody molecule 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 complementarity 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 stπngency of the hybridization process, with more stringent conditions allowing less non-specific binding, l 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/ml sheared, denatured salmon sperm DNA Generally, stringency of hybridization is expressed, in part, with reference to the temperature under which the wash step is caπied out Such wash temperatures are typically selected to be about 5°C to 20°C lower than the thermal melting point (T m ) 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, J et al (1989) Molecular Cloning A Laboratory 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, sheared and 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 0 t or Rgt 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 systemic defense systems. An "immunogenic fragment" is a polypeptide or ohgopeptide fragment of NHREC which is capable of eliciting an immune response when introduced into a living organism, for example, a mammal. The term "immunogenic fragment" also includes any polypeptide or ohgopeptide fragment of NHREC which is useful in any of the antibody production methods disclosed herein or known in the art. The term "microaπay" refers to an aπangement of a plurality of polynucleotides, polypeptides, or other chemical compounds on a substrate. The terms "element" and "aπay element" refer to a polynucleotide, polypeptide, or other chemical compound having a unique and defined position on a microaπay. The term "modulate" refers to a change in the activity of NHREC. For example, modulation may cause an increase or a decrease in protein activity, binding characteristics, or any other biological, functional, or immunological properties of NHREC. 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 a 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. 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. "Post-translational modification" of an NHREC may involve lipidation, glycosylation, phosphorylation, acetylation, racemization, proteolytic cleavage, and other modifications known in the art. These processes may occur synthetically or biochemically. Biochemical modifications will vary by cell type depending on the enzymatic milieu of NHREC. "Probe" refers to nucleic acid sequences encoding NHREC, 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, J. et al. (1989) Molecular Cloning: A Laboratory Manual, 2 nd ed., vol. 1-3, Cold Spring Harbor Press, Plainview NY; Ausubel, F.M. et al. (1987) Cuπent Protocols in Molecular Biology, Greene Publ. Assoc. & Wiley-Intersciences, New York NY; Innis, M. 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 incoφorated 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 microaπay s. (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, microaπay 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 mammal wherein the recombinant nucleic acid is expressed, inducing a protective immunological response in the mammal. A "regulatory element" refers to a nucleic acid sequence usually derived from untranslated regions of a gene and includes enhancers, promoters, introns, and 5' and 3' untranslated regions (UTRs). Regulatory elements interact with host or viral proteins which control transcription, translation, or RNA stability. "Reporter molecules" are chemical or biochemical moieties used for labeling a nucleic acid, amino acid, or antibody. Reporter molecules include radionuclides; enzymes; fluorescent, chemiluminescent, or chromogenic agents; substrates; cofactors; inhibitors; magnetic particles; and other moieties known in the art. An "RNA equivalent," in reference to a DNA sequence, is composed of the same linear sequence of nucleotides as the reference DNA sequence with the exception that all occuπences of the nitrogenous base thymine are replaced with uracil, and the sugar backbone is composed of ribose instead of deoxyribose. The term "sample" is used in its broadest sense. A sample suspected of containing NHREC, nucleic acids encoding NHREC, or fragments thereof 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 comprising 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 60% free, preferably at least 75% free, and most preferably at least 90% free from other components with which they are naturally associated. A "substitution" refers to the replacement of one or more amino acid residues or nucleotides by different amino acid residues or nucleotides, respectively. "Substrate" refers to any suitable rigid or semi-rigid support including membranes, filters, chips, slides, wafers, fibers, magnetic or nonmagnetic beads, gels, 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. A "transcript image" refers to the collective pattern of gene expression by a particular cell type or tissue under given conditions at a given time. "Transformation" describes a process by which exogenous DNA is introduced into 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, bacteriophage or 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 "transgenic organism," as used herein, is any organism, including but not limited to animals and plants, in which one or more of the cells of the organism contains heterologous nucleic acid introduced by way of human intervention, such as by transgenic techniques well known in the art. The nucleic acid is introduced into the cell, directly or indirectly by introduction into a precursor of the cell, by way of deliberate genetic manipulation, such as by microinjection or by infection with a recombinant virus. The term genetic manipulation does not include classical cross-breeding, or in vitro fertilization, but rather is directed to the introduction of a recombinant DNA molecule. The transgenic organisms contemplated in accordance with the present invention include bacteria, cyanobacteria, fungi, plants and animals. The isolated DNA of the present invention can be introduced into the host by methods known in the art, for example infection, transfection, transformation or transconjugation. Techniques for transferring the DNA of the present invention into such organisms are widely known and provided in references such as Sambrook et al. (1989), supra. 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 "polymoφhic" 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 alternative splicing of exons during mRNA processing. The coπesponding 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 will generally have significant amino acid identity relative to each other A polymoφhic variant is a variation in the polynucleotide sequence of a particular gene between individuals of a given species Polymoφhic variants also may encompass "single nucleotide polymoφhisms" (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 70%, 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 nuclear hormone receptors (NHREC), the polynucleotides encoding NHREC, and the use of these compositions for the diagnosis, treatment, or prevention of metabolic, endocrine, reproductive, developmental, immunological, and cell proliferative disorders Table 1 summarizes the nomenclature for the full length polynucleotide and polypeptide sequences of the invention Each polynucleotide and its coπesponding polypeptide are correlated to a single Incyte project identification number (Incyte Project ID) Each polypeptide sequence is denoted by both a polypeptide sequence identification number (Polypeptide SEQ ID NO ) and an Incyte polypeptide sequence number (Incyte Polypeptide ID) as shown Each polynucleotide sequence is denoted by both a polynucleotide sequence identification number (Polynucleotide SEQ ID NO ) and an Incyte polynucleotide consensus sequence number (Incyte Polynucleotide ID) as shown Table 2 shows sequences with homology to the polypeptides of the invention as identified by BLAST analysis against the GenBank protein (genpept) database Columns 1 and 2 show the polypeptide sequence identification number (Polypeptide SEQ ID NO ) and the coπesponding Incyte polypeptide sequence number (Incyte Polypeptide ID) for polypeptides of the invention Column 3 shows the GenBank identification number (Genbank ID NO ) of the nearest GenBank homolog Column 4 shows the probability score for the match between each polypeptide and its GenBank homolog Column 5 shows the annotation of the GenBank homolog along with relevant citations where applicable, all of which are expressly incoφorated by reference herein Table 3 shows various structural features of the polypeptides of the invention Columns 1 and 2 show the polypeptide sequence identification number (SEQ ID NO:) and the coπesponding Incyte polypeptide sequence number (Incyte Polypeptide ID) for each polypeptide of the invention. Column 3 shows the number of amino acid residues in each polypeptide. Column 4 shows potential phosphorylation sites, and column 5 shows potential glycosylation sites, as determined by the MOTIFS program of the GCG sequence analysis software package (Genetics Computer Group, Madison WI). Column 6 shows amino acid residues comprising signature sequences, domains, and motifs. Column 7 shows analytical methods for protein structure/function analysis and in some cases, searchable databases to which the analytical methods were applied. Together, Tables 2 and 3 summarize the properties of polypeptides of the invention, and these properties establish that the claimed polypeptides are nuclear hormone receptors. For example, SEQ ID NO:3 is 91 % identical to Rattus norvegicus farnesoid X activated receptor (GenBank ID g868032) as determined by the Basic Local Alignment Search Tool (BLAST). (See Table 2.) The BLAST probability score is 3.8e-236, which indicates the probability of obtaining the observed polypeptide sequence alignment by chance. SEQ ID NO:3 also contains a nuclear hormone receptor ligand- binding domain as determined by searching for statistically significant matches in the hidden Markov model (HMM)-based PFAM database of conserved protein family domains. (See Table 3.) Data from BLIMPS, MOTIFS, and PROFJLESCAN analyses provide further coπoborative evidence that SEQ ID NO:3 is a steroid hormone receptor. SEQ ID NO: 1 and SEQ ID NO:2 were analyzed and annotated in a similar manner. The algorithms and parameters for the analysis of SEQ ID NO: 1 -3 are described in Table 7. As shown in Table 4, the full length polynucleotide sequences of the present invention were assembled using cDNA sequences or coding (exon) sequences derived from genomic DNA, or any combination of these two types of sequences. Columns 1 and 2 list the polynucleotide sequence identification number (Polynucleotide SEQ ID NO:) and the coπesponding Incyte polynucleotide consensus sequence number (Incyte Polynucleotide ID) for each polynucleotide of the invention. Column 3 shows the length of each polynucleotide sequence in basepairs. Column 4 lists fragments of the polynucleotide sequences which are useful, for example, in hybridization or amplification technologies that identify SEQ ID NO:4-6 or that distinguish between SEQ ID NO:4-6 and related polynucleotide sequences. Column 5 shows identification numbers coπesponding to cDNA sequences, coding sequences (exons) predicted from genomic DNA, and/or sequence assemblages comprised of both cDNA and genomic DNA. These sequences were used to assemble the full length polynucleotide sequences of the invention. Columns 6 and 7 of Table 4 show the nucleotide start (5') and stop (3') positions of the cDNA and genomic sequences in column 5 relative to their respective full length sequences. The identification numbers in Column 5 of Table 4 may refer specifically, for example, to Incyte cDNAs along with their coπesponding cDNA libraries. For example, 6812329H1 is the identification number of an Incyte cDNA sequence, and ADRETUR01 is the cDNA library from which it is derived. Incyte cDNAs for which cDNA libraries are not indicated were derived from pooled cDNA libraries (e.g., 71218724V1). Alternatively, the identification numbers in column 5 may refer to GenBank cDNAs or ESTs (e.g., g2368743) which contributed to the assembly of the full length polynucleotide sequences. Alternatively, the identification numbers in column 5 may refer to coding regions predicted by Genscan analysis of genomic DNA. For example, g4096054.vl 13.gs_2.nt is the identification number of a Genscan-predicted coding sequence, with g4096054 being the GenBank identification number of the sequence to which Genscan was applied. The Genscan-predicted coding sequences may have been edited prior to assembly. (See Example IV.) Alternatively, the identification numbers in column 5 may refer to assemblages of both cDNA and Genscan-predicted exons brought together by an "exon stitching" algorithm. (See Example V.) Alternatively, the identification numbers in column 5 may refer to assemblages of both cDNA and Genscan-predicted exons brought together by an "exon-stretching" algorithm. (See Example V.) In some cases, Incyte cDNA coverage redundant with the sequence coverage shown in column 5 was obtained to confirm the final consensus polynucleotide sequence, but the relevant Incyte cDNA identification numbers are not shown. Table 5 shows the representative cDNA libraries for those full length polynucleotide sequences which were assembled using Incyte cDNA sequences. The representative cDNA library is the Incyte cDNA library which is most frequently represented by the Incyte cDNA sequences which were used to assemble and confirm the above polynucleotide sequences. The tissues and vectors which were used to construct the cDNA libraries shown in Table 5 are described in Table 6. The invention also encompasses NHREC variants. A prefeπed NHREC 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 NHREC amino acid sequence, and which contains at least one functional or structural characteristic of NHREC. The invention also encompasses polynucleotides which encode NHREC. In a particular embodiment, the invention encompasses a polynucleotide sequence comprising a sequence selected from the group consisting of SEQ ID NO:4-6, which encodes NHREC. The polynucleotide sequences of SEQ ID NO:4-6, as presented in the Sequence Listing, embrace the equivalent RNA sequences, wherein occuπences of the nitrogenous base thymine are replaced with uracil, and the sugar backbone is composed of ribose instead of deoxyribose. The invention also encompasses a variant of a polynucleotide sequence encoding NHREC. 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 NHREC. 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:4- 6 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:4-6. Any one of the polynucleotide variants described above can encode an amino acid sequence which contains at least one functional or structural characteristic of NHREC. 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 NHREC, some bearing minimal similarity to the polynucleotide sequences of any known and naturally occuπing 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 occuπing NHREC, and all such variations are to be considered as being specifically disclosed. Although nucleotide sequences which encode NHREC and its variants are generally capable of hybridizing to the nucleotide sequence of the naturally occuπing NHREC under appropriately selected conditions of stringency, it may be advantageous to produce nucleotide sequences encoding NHREC or its derivatives possessing a substantially different codon usage, e.g., inclusion of non- naturally occuπing 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 NHREC 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 NHREC and NHREC 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 NHREC 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:4-6 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 Enzymol. 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 (Applied Biosystems), 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 (Applied Biosystems). Sequencing is then caπied out using either the ABI 373 or 377 DNA sequencing system (Applied Biosystems), 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 7.7; Meyers, R.A. (1995) Molecular Biology and Biotechnology. Wiley VCH, New York NY, pp. 856-853.) The nucleic acid sequences encoding NHREC 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 suπounding 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 al. ( 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, Applied Biosystems), 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 NHREC may be cloned in recombinant DNA molecules that direct expression of NHREC, 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 NHREC. The nucleotide sequences of the present invention can be engineered using methods generally known in the art in order to alter NHREC-encoding sequences for a variety of puφoses 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. The nucleotides of the present invention may be subjected to DNA shuffling techniques such as MOLECULARBREEDING (Maxygen Inc., Santa Clara CA; described in U.S. Patent Number 5,837,458; Chang, C-C. et al. (1999) Nat. Biotechnol. 17:793-797; Christians, F.C. et al. (1999) Nat. Biotechnol. 17:259-264; and Crameri, A. et al. (1996) Nat. Biotechnol. 14:315-319) to alter or improve the biological properties of NHREC, such as its biological or enzymatic activity or its ability to bind to other molecules or compounds. DNA shuffling is a process by which a library of gene variants is produced using PCR-mediated recombination of gene fragments. The library is then subjected to selection or screening procedures that identify those gene variants with the desired properties. These prefeπed variants may then be pooled and further subjected to recursive rounds of DNA shuffling and selection/screening Thus, genetic diversity is created through "artificial" breeding and rapid molecular evolution For example, fragments of a single gene containing random point mutations may be recombined, screened, and then reshuffled until the desired properties are optimized Alternatively, fragments of a given gene may be recombined with fragments of homologous genes in the same gene family, either from the same or different species, thereby maximizing the genetic diversity of multiple naturally occuπing genes in a directed and controllable manner In another embodiment, sequences encoding NHREC 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, NHREC itself or a fragment thereof may be synthesized using chemical methods For example, peptide synthesis can be performed using various solution-phase or solid-phase techniques (See, e g , Creighton, T (1984) Proteins, Structures and Molecular Properties, WH Freeman, New York NY, pp 55-60, and Roberge, J Y et al (1995) Science 269 202-204 ) Automated synthesis may be achieved using the ABI 431 A peptide synthesizer (Applied Biosystems) Additionally, the amino acid sequence of NHREC, 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 or a polypeptide having a sequence of a naturally occuπing 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, supra, pp 28-53 ) In order to express a biologically active NHREC, the nucleotide sequences encoding NHREC or derivatives thereof may be inserted into an appropriate expression vector, l 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 NHREC Such elements may vary in their strength and specificity Specific initiation signals may also be used to achieve more efficient translation of sequences encoding NHREC Such signals include the ATG initiation codon and adjacent sequences, e g the Kozak sequence In cases where sequences encoding NHREC 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 m- frame ATG initiation codon should be 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 NHREC and appropriate transcriptional and translational control elements. These methods include in vitro recombinant DNA techniques, synthetic techniques, and in vivo genetic recombination. (See, e.g., Sambrook, J. et al. (1989) Molecular Cloning, A Laboratory Manual, Cold Spring Harbor Press, Plainview NY, ch. 4, 8, and 16-17; Ausubel, F.M. et al. (1995) Cuπent 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 NHREC. 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. (See, e.g., Sambrook, supra; Ausubel, supra; Van Heeke, G. and S.M. Schuster (1989) J. Biol. Chem. 264:5503-5509; 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; Takamatsu, N. (1987) EMBO J. 6:307-31 1 : The McGraw Hill Yearbook of Science and Technology (1992) McGraw Hill, New York NY, pp. 191-196; Logan, J. and T. Shenk (1984) Proc. Natl. Acad. Sci. USA 81 :3655-3659; and Haπington, J.J. et al. (1997) Nat. Genet. 15:345-355.) 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. (See, e.g., Di Nicola, M. et al. (1998) Cancer Gen. Ther. 5(6):350-356; Yu, M. et al. (1993) Proc. Natl. Acad. Sci. USA 90(13):6340-6344; Buller, R.M. et al. (1985) Nature 317(6040):813-815; McGregor, D.P. et al. (1994) Moi. Immunol. 31(3):219-226; and Verma, I.M. and N. Somia (1997) Nature 389:239-242.) 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 NHREC. For example, routine cloning, subcloning, and propagation of polynucleotide sequences encoding NHREC can be achieved using a multifunctional E. coli vector such as PBLUESCRff (Stratagene, La Jolla CA) or PSPORT1 plasmid (Life Technologies). Ligation of sequences encoding NHREC into the vector's multiple cloning site disrupts the lacL 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 NHREC are needed, e.g. for the production of antibodies, vectors which direct high level expression of NHREC may be used. For example, vectors containing the strong, inducible SP6 or T7 bacteriophage promoter may be used. Yeast expression systems may be used for production of NHREC. A number of vectors containing constitutive or inducible promoters, such as alpha factor, alcohol oxidase, and PGH promoters, may be used in the yeast Saccharomyces 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 NHREC. Transcription of sequences encoding NHREC may be driven by 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 NHREC 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 NHREC 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 puφoses. (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 NHREC in cell lines is prefeπed For example, sequences encoding NHREC 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 puφose 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 heφes simplex virus thymidine kinase and ademne 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 al (1980) Cell 22 817-823 ) Also, antimetabohte, 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 pat confer resistance to chlorsulfuron and phosphinotπcin 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 Moi 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 , anthocyamns, 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 A (1995) Methods Moi 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 NHREC is inserted within a marker gene sequence, transformed cells containing sequences encoding NHREC can be identified by the absence of marker gene function Alternatively, a marker gene can be placed in tandem with a sequence encoding NHREC 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 NHREC and that express NHREC 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 lmmunoassay 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 NHREC 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 NHREC is prefeπed, 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 Laboratory Manual, APS Press, St Paul MN, Sect PV, Cohgan, J E et al (1997) Cuπent 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 NHREC include ohgolabehng, nick translation, end-labeling, or PCR amplification using a labeled nucleotide Alternatively, the sequences encoding NHREC, 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 WI), and US Biochemical Suitable reporter molecules or labels which may be used for ease of detection include radionuchdes, enzymes, fluorescent, chemiluminescent, or chromogenic agents, as well as substrates, cofactors, inhibitors, magnetic particles, and the like Host cells transformed with nucleotide sequences encoding NHREC 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 NHREC may be designed to contain signal sequences which direct secretion of NHREC 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, hpidation, 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 Ameπcan Type Culture Collection (ATCC, Manassas VA) and may be chosen to ensure the coπect modification and processing of the foreign protein In another embodiment of the invention, natural, modified, or recombinant nucleic acid sequences encoding NHREC 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 NHREC protein containing a heterologous moiety that can be recognized by a commercially available antibody may facilitate the screening of peptide libraries for inhibitors of NHREC 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), calmodulm binding peptide (CBP), 6-Hιs, FLAG, c-myc, and hemagglutinm (HA) GST, MBP, Trx, CBP, and 6-Hιs enable purification of their cognate fusion proteins on immobilized glutathione, maltose, phenylarsine oxide, calmodulm, and metal-chelate resins, respectively FLAG, c-myc, and hemagglutinm (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 NHREC encoding sequence and the heterologous protein sequence, so that NHREC 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 NHREC may be achieved in 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-methιonιne NHREC of the present invention or fragments thereof may be used to screen for compounds that specifically bind to NHREC At least one and up to a plurality of test compounds may be screened for specific binding to NHREC Examples of test compounds include antibodies, oligonucleotides, proteins (e g , receptors), or small molecules In one embodiment, the compound thus identified is closely related to the natural ligand of NHREC, e g , a ligand or fragment thereof, a natural substrate, a structural or functional mimetic, or a natural binding partner (See, e g , Cohgan, J E et al (1991) Cuπent Protocols in Immunology 1(2) Chapter 5 ) Similarly, the compound can be closely related to the natural receptor to which NHREC binds, or to at least a fragment of the receptor, e g , the ligand binding site In either case, the compound can be rationally designed using known techniques In one embodiment, screening for these compounds involves producing appropriate cells which express NHREC, either as a secreted protein or on the cell membrane. Prefeπed cells include cells from mammals, yeast, Drosophila, or E. coli. Cells expressing NHREC or cell membrane fractions which contain NHREC are then contacted with a test compound and binding, stimulation, or inhibition of activity of either NHREC or the compound is analyzed. An assay may simply test binding of a test compound to the polypeptide, wherein binding is detected by a fluorophore, radioisotope, enzyme conjugate, or other detectable label. For example, the assay may comprise the steps of combining at least one test compound with NHREC, either in solution or affixed to a solid support, and detecting the binding of NHREC to the compound. Alternatively, the assay may detect or measure binding of a test compound in the presence of a labeled competitor. Additionally, the assay may be caπied out using cell-free preparations, chemical libraries, or natural product mixtures, and the test compound(s) may be free in solution or affixed to a solid support. NHREC of the present invention or fragments thereof may be used to screen for compounds that modulate the activity of NHREC. Such compounds may include agonists, antagonists, or partial or inverse agonists. In one embodiment, an assay is performed under conditions permissive for NHREC activity, wherein NHREC is combined with at least one test compound, and the activity of NHREC in the presence of a test compound is compared with the activity of NHREC in the absence of the test compound. A change in the activity of NHREC in the presence of the test compound is indicative of a compound that modulates the activity of NHREC. Alternatively, a test compound is combined with an in vitro or cell-free system comprising NHREC under conditions suitable for NHREC activity, and the assay is performed. In either of these assays, a test compound which modulates the activity of NHREC may do so indirectly and need not come in direct contact with the test compound. At least one and up to a plurality of test compounds may be screened. In another embodiment, polynucleotides encoding NHREC or their mammalian homologs may be "knocked out" in an animal model system using homologous recombination in embryonic stem (ES) cells. Such techniques are well known in the art and are useful for the generation of animal models of human disease. (See, e.g., U.S. Patent Number 5,175,383 and U.S. Patent Number 5,767,337.) For example, mouse ES cells, such as the mouse 129/SvJ cell line, are derived from the early mouse embryo and grown in culture. The ES cells are transformed with a vector containing the gene of interest disrupted by a marker gene, e.g., the neomycin phosphotransferase gene (neo; Capecchi, M.R. (1989) Science 244:1288-1292). The vector integrates into the coπesponding region of the host genome by homologous recombination. Alternatively, homologous recombination takes place using the Cre-loxP system to knockout a gene of interest in a tissue- or developmental stage- specific manner (Marth, J.D. (1996) Clin. Invest. 97: 1999-2002; Wagner, K.U. et al. (1997) Nucleic Acids Res. 25:4323-4330). Transformed ES cells are identified and microinjected into mouse cell blastocysts such as those from the C57BL/6 mouse strain. The blastocysts are surgically transfeπed to pseudopregnant dams, and the resulting chimeric progeny are genotyped and bred to produce heterozygous or homozygous strains. Transgenic animals thus generated may be tested with potential therapeutic or toxic agents. Polynucleotides encoding NHREC may also be manipulated in vitro in ES cells derived from human blastocysts. Human ES cells have the potential to differentiate into at least eight separate cell lineages including endoderm, mesoderm, and ectodermal cell types. These cell lineages differentiate into, for example, neural cells, hematopoietic lineages, and cardiomyocytes (Thomson, J.A. et al. (1998) Science 282: 1 145-1 147). Polynucleotides encoding NHREC can also be used to create "knockin" humanized animals (pigs) or transgenic animals (mice or rats) to model human disease. With knockin technology, a region of a polynucleotide encoding NHREC is injected into animal ES cells, and the injected sequence integrates into the animal cell genome. Transformed cells are injected into blastulae, and the blastulae are implanted as described above. Transgenic progeny or inbred lines are studied and treated with potential pharmaceutical agents to obtain information on treatment of a human disease. Alternatively, a mammal inbred to overexpress NHREC, e.g., by secreting NHREC in its milk, may also serve as a convenient source of that protein (Janne, J. et al. ( 1998) Biotechnol. Annu. Rev. 4:55- 74). THERAPEUTICS Chemical and structural similarity, e.g., in the context of sequences and motifs, exists between regions of NHREC and nuclear hormone receptors. In addition, the expression of NHREC is closely associated with digestive tract disorders and with gastrointestinal tissue. Therefore, NHREC appears to play a role in metabolic, endocrine, reproductive, developmental, immunological, and cell proliferative disorders. In the treatment of disorders associated with increased NHREC expression or activity, it is desirable to decrease the expression or activity of NHREC. In the treatment of disorders associated with decreased NHREC expression or activity, it is desirable to increase the expression or activity of NHREC. Therefore, in one embodiment, NHREC 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 NHREC. Examples of such disorders include, but are not limited to, a metabolic disorder such as Addison's disease, cerebrotendinous xanthomatosis, congenital adrenal hypeφlasia, coumarin resistance, cystic fibrosis, diabetes, fatty hepatociπhosis, fructose- 1,6-diphosphatase deficiency, galactosemia, goiter, glucagonoma, glycogen storage diseases, hereditary fructose intolerance, hyperadrenalism, hypoadrenalism, hypeφarathyroidism, hypoparathyroidism, hypercholesterolemia, hyperthyroidism, hypoglycemia, hypothyroidism, hyperlipidemia, hyperlipemia, lipid myopathies, lipodystrophies, lysosomal storage diseases, mannosidosis, neuraminidase deficiency, obesity, pentosuria phenylketonuria, and pseudovitamin D-deficiency rickets; an endocrine disorder such as a disorder of the hypothalamus and pituitary resulting from lesions such as primary brain tumors, an adenoma, infarction associated with pregnancy, hypophysectomy, aneurysms, vascular malformations, thrombosis, infections, immunological disorders, and complications due to head trauma, disorders associated with hypopituitarism including hypogonadism, Sheehan syndrome, diabetes insipidus, Kallman's disease, Hand-Schuller-Christian disease, Letterer-Siwe disease, sarcoidosis, empty sella syndrome, and dwarfism, disorders associated with hypeφituitarism including acromegaly, giantism, and syndrome of inappropriate antidiuretic hormone (ADH) secretion (SIADH) often caused by benign adenoma, disorders associated with hypothyroidism including goiter, myxedema, acute thyroiditis associated with bacterial infection, subacute thyroiditis associated with viral infection, autoimmune thyroiditis (Hashimoto's disease), and cretinism, disorders associated with hyperthyroidism including thyrotoxicosis and its various forms, Grave's disease, pretibial myxedema, toxic multinodular goiter, thyroid carcinoma, and Plummer's disease, disorders associated with hypeφarathyroidism including Conn disease (chronic hypercalemia), pancreatic disorders such as Type I or Type II diabetes mellitus and associated complications, disorders associated with the adrenals such as hypeφlasia, carcinoma, or adenoma of the adrenal cortex, hypertension associated with alkalosis, amyloidosis, hypokalemia, Cushing's disease, Liddle's syndrome, and Arnold-Healy-Gordon syndrome, pheochromocytoma tumors, and Addison's disease, disorders associated with gonadal steroid hormones such as: in women, abnormal prolactin production, infertility, endometriosis, perturbations of the menstrual cycle, polycystic ovarian disease, hypeφrolactinemia, isolated gonadotropin deficiency, amenoπhea, galactoπhea, hermaphroditism, hirsutism and virilization, breast cancer, and, in post-menopausal women, osteoporosis, and, in men, Leydig cell deficiency, male climacteric phase, and germinal cell aplasia, hypergonadal disorders associated with Leydig cell tumors, androgen resistance associated with absence of androgen receptors, syndrome of 5 α-reductase, and gynecomastia; a reproductive disorder such as a disorder of prolactin production, infertility, including tubal disease, ovulatory defects, and endometriosis, a disruption of the estrous cycle, a disruption of the menstrual cycle, polycystic ovary syndrome, ovarian hyperstimulation syndrome, an endometrial or ovarian tumor, a uterine fibroid, autoimmune disorders, an ectopic pregnancy, and teratogenesis, cancer of the breast, fibrocystic breast disease, and galactorrhea, a disruption of spermatogenesis, abnormal sperm physiology, cancer of the testis, cancer of the prostate, benign prostatic hypeφlasia, prostatitis, Peyronie's disease, impotence, carcinoma of the male breast, and gynecomastia; a developmental disorder such as renal tubular acidosis, anemia, Cushing's syndrome, achondroplastic dwarfism, Duchenne and Becker muscular dystrophy, epilepsy, gonadal dysgenesis, WAGR syndrome (Wilms' tumor, aniπdia, genitourinary abnormalities, and mental retardation), Smith-Magenis syndrome, myelodysplastic syndrome, hereditary mucoepithehal dysplasia, hereditary keratodermas, hereditary neuropathies such as Charcot-Maπe-Tooth disease and neurofibromatosis, hypothyroidism, hydrocephalus, seizure disorders such as Syndenham's chorea and cerebral palsy, spma bifida, anencephaly, craniorachischisis, congenital glaucoma, cataract, and sensoπneural heaπng loss, an immunological disorder such as acquired immunodeficiency syndrome (AIDS), Addison's disease, adult respiratory distress syndrome, allergies, ankylosmg spondyhtis, amyloidosis, anemia, asthma, atherosclerosis, autoimmune hemolytic anemia, autoimmune thyroiditis, autoimmune polyendocπnopathy- candidiasis-ectodermal dystrophy (APECED), bronchitis, cholecystitis, contact dermatitis, Crohn's disease, atopic dermatitis, dermatomyositis, diabetes mellitus, emphysema, episodic lymphopenia with lymphocytotoxms, erythroblastosis fetalis, erythema nodosum, atrophic gastritis, glomerulonephπtis, Goodpasture's syndrome, gout, Graves' disease, Hashimoto's thyroiditis, hypereosinophiha, irritable bowel syndrome, multiple sclerosis, myasthenia gravis, myocardial or pericardial inflammation, osteoarthritis, osteoporosis, pancreatitis, polymyositis, psoriasis, Reiter's syndrome, rheumatoid arthπtis, scleroderma, Sjogren's syndrome, systemic anaphylaxis, systemic lupus erythematosus, systemic sclerosis, thrombocytopenic puφura, ulcerative colitis, uveitis, Werner syndrome, complications of cancer, hemodialysis, and extracoφoreal circulation, viral, bacterial, fungal, parasitic, protozoal, and helminthic infections, and trauma, and a cell proliferative disorder such as actinic keratosis, arteriosclerosis, atherosclerosis, bursitis, ciπhosis, hepatitis, mixed connective tissue disease (MCTD), myelofibrosis, paroxysmal nocturnal hemoglobinuπa, 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 maπow, 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 In another embodiment, a vector capable of expressing NHREC 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 NHREC including, but not limited to, those described above In a further embodiment, a composition comprising a substantially puπfied NHREC in conjunction with a suitable pharmaceutical caπier may be administered to a subject to treat or prevent a disorder associated with decreased expression or activity of NHREC including, but not limited to, those provided above In still another embodiment, an agonist which modulates the activity of NHREC may be administered to a subject to treat or prevent a disorder associated with decreased expression or activity of NHREC including, but not limited to, those listed above. In a further embodiment, an antagonist of NHREC may be administered to a subject to treat or prevent a disorder associated with increased expression or activity of NHREC. Examples of such disorders include, but are not limited to, those metabolic, endocrine, reproductive, developmental, immunological, and cell proliferative disorders described above. In one aspect, an antibody which specifically binds NHREC 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 NHREC. In an additional embodiment, a vector expressing the complement of the polynucleotide encoding NHREC may be administered to a subject to treat or prevent a disorder associated with increased expression or activity of NHREC 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 NHREC may be produced using methods which are generally known in the art. In particular, purified NHREC may be used to produce antibodies or to screen libraries of pharmaceutical agents to identify those which specifically bind NHREC. Antibodies to NHREC 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 prefeπed for therapeutic use. For the production of antibodies, various hosts including goats, rabbits, rats, mice, humans, and others may be immunized by injection with NHREC or with any fragment or ohgopeptide 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 Corynebacterium parvum are especially preferable. It is preferred that the oligopeptides, peptides, or fragments used to induce antibodies to NHREC 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. Short stretches of NHREC 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 NHREC 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, RJ. et al. ( 1983) Proc. Natl. Acad. Sci. USA 80:2026-2030; and Cole, S.P. et al. (1984) Moi. 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., Moπison, 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 NHREC-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 NHREC 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 NHREC and its specific antibody. A two-site, monoclonal-based immunoassay utilizing monoclonal antibodies reactive to two non-interfering NHREC 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 NHREC. Affinity is expressed as an association constant, K a , which is defined as the molar concentration of NHREC-antibody complex divided by the molar concentrations of free antigen and free antibody under equilibrium conditions. The K a determined for a preparation of polyclonal antibodies, which are heterogeneous in their affinities for multiple NHREC epitopes, represents the average affinity, or avidity, of the antibodies for NHREC. The K a determined for a preparation of monoclonal antibodies, which are monospecific for a particular NHREC 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 prefeπed for use in immunoassays in which the NHREC-antibody complex must withstand rigorous manipulations. Low-affinity antibody preparations with K a ranging from about 10 6 to 10 7 L/mole are prefeπed for use in immunopurification and similar procedures which ultimately require dissociation of NHREC, preferably in active form, from the antibody (Catty, D. (1988) Antibodies, Volume I: A Practical Approach, IRL Press, Washington DC; Liddell, J.E. and A. Cryer (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 NHREC-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 NHREC, or any fragment or complement thereof, may be used for therapeutic puφoses. In one aspect, modifications of gene expression can be achieved by designing complementary sequences or antisense molecules (DNA, RNA, PNA, or modified oligonucleotides) to the coding or regulatory regions of the gene encoding NHREC. Such technology is well known in the art, and antisense oligonucleotides or larger fragments can be designed from various locations along the coding or control regions of sequences encoding NHREC. (See, e.g., Agrawal, S., ed. (1996) Antisense Therapeutics, Humana Press Inc., Totawa NJ.) In therapeutic use, any gene delivery system suitable for introduction of the antisense sequences into appropriate target cells can be used. Antisense sequences can be delivered intracellularly in the form of an expression plasmid which, upon transcription, produces a sequence complementary to at least a portion of the cellular sequence encoding the target protein. (See, e.g., Slater, J.E. et al. (1998) J. Allergy Cli. Immunol. 102(3):469-475; and Scanlon, K.J. et al. (1995) 9(13): 1288-1296.) Antisense sequences can also be introduced intracellularly through the use of viral vectors, such as retrovirus and adeno-associated virus vectors. (See, e.g., Miller, A.D. (1990) Blood 76:271 ; Ausubel, supra; Uckert, W. and W. Walther (1994) Pharmacol. Ther. 63(3):323-347.) Other gene delivery mechanisms include liposome-derived systems, artificial viral envelopes, and other systems known in the art. (See, e.g., Rossi, J.J. (1995) Br. Med. Bull. 51 ( 1):217-225; Boado, R.J. et al. (1998) J. Pharm. Sci. 87(1 1): 1308-1315; and Moπis, M.C et al. (1997) Nucleic Acids Res. 25(14):2730-2736.) In another embodiment of the invention, polynucleotides encoding NHREC may be used for somatic or germline gene therapy. Gene therapy may be performed to (i) coπect a genetic deficiency (e.g., in the cases of severe combined immunodeficiency (SCID)-Xl disease characterized by X- linked inheritance (Cavazzana-Calvo, M. et al. (2000) Science 288:669-672), severe combined immunodeficiency syndrome associated with an inherited adenosine deaminase (ADA) deficiency (Blaese, R.M. et al. (1995) Science 270:475-480; Bordignon, C et al. (1995) Science 270:470-475), cystic fibrosis (Zabner, J. et al. (1993) Cell 75:207-216; Crystal, R.G. et al. (1995) Hum. Gene Therapy 6:643-666; Crystal, R.G. et al. (1995) Hum. Gene Therapy 6:667-703), thalassamias, familial hypercholesterolemia, and hemophilia resulting from Factor VIII or Factor IX deficiencies (Crystal, R.G. (1995) Science 270:404-410; Verma, I.M. and N. Somia (1997) Nature 389:239-242)), (ii) express a conditionally lethal gene product (e.g., in the case of cancers which result from unregulated cell proliferation), or (iii) express a protein which affords protection against intracellular parasites (e.g., against human retroviruses, such as human immunodeficiency virus (HIV) (Baltimore, D. (1988) Nature 335:395-396; Poeschla, E. et al. (1996) Proc. Natl. Acad. Sci. USA. 93:1 1395-1 1399), hepatitis B or C virus (HBV, HCV); fungal parasites, such as Candida albicans and Paracoccidioides brasiliensis; and protozoan parasites such as Plasmodium falciparum and Trvpanosoma cruzi). In the case where a genetic deficiency in NHREC expression or regulation causes disease, the expression of NHREC from an appropriate population of transduced cells may alleviate the clinical manifestations caused by the genetic deficiency. In a further embodiment of the invention, diseases or disorders caused by deficiencies in NHREC are treated by constructing mammalian expression vectors encoding NHREC and introducing these vectors by mechanical means into NHREC-deficient cells. Mechanical transfer technologies for use with cells in vivo or ex vitro include (i) direct DNA microinjection into individual cells, (ii) ballistic gold particle delivery, (iii) liposome-mediated transfection, (iv) receptor- mediated gene transfer, and (v) the use of DNA transposons (Morgan, R.A. and W.F. Anderson (1993) Annu. Rev. Biochem. 62: 191-217; Ivies, Z. (1997) Cell 91 :501-510; Boulay, J-L. and H. Recipon (1998) Cuπ. Opin. Biotechnol. 9:445-450). Expression vectors that may be effective for the expression of NHREC include, but are not limited to, the PCDNA 3.1, EPITAG, PRCCMV2, PREP, PVAX vectors (hivitrogen, Carlsbad CA), PCMV-SCRrPT, PCMV-TAG, PEGSH/PERV (Stratagene, La Jolla CA), and PTET-OFF, PTET-ON, PTRE2, PTRE2-LUC, PTK-HYG (Clontech, Palo Alto CA). NHREC may be expressed using (i) a constitutively active promoter, (e.g., from cytomegalovirus (CMV), Rous sarcoma virus (RSV), SV40 virus, thymidine kinase (TK), or β-actin genes), (ii) an inducible promoter (e.g., the tetracycline-regulated promoter (Gossen, M. and H. Bujard (1992) Proc. Natl. Acad. Sci. USA 89:5547-5551 ; Gossen, M. et al. (1995) Science 268: 1766-1769; Rossi, F.M.V. and H.M. Blau (1998) Cuπ. Opin. Biotechnol. 9:451-456), commercially available in the T-REX plasmid (Invitrogen)); the ecdysone-inducible promoter (available in the plasmids PVGRXR and PIND; Invitrogen); the FK506/rapamycin inducible promoter; or the RU486/mifepristone inducible promoter (Rossi, F.M.V. and Blau, H.M. supra)), or (iii) a tissue-specific promoter or the native promoter of the endogenous gene encoding NHREC from a normal individual. Commercially available liposome transformation kits (e.g., the PERFECT LIPID TRANSFECTION KIT, available from Invitrogen) allow one with ordinary skill in the art to deliver polynucleotides to target cells in culture and require minimal effort to optimize experimental parameters. In the alternative, transformation is performed using the calcium phosphate method (Graham, F.L. and A.J. Eb (1973) Virology 52:456-467), or by electroporation (Neumann, E. et al. (1982) EMBO J. 1 :841-845). The introduction of DNA to primary cells requires modification of these standardized mammalian transfection protocols. In another embodiment of the invention, diseases or disorders caused by genetic defects with respect to NHREC expression are treated by constructing a retrovirus vector consisting of (i) the polynucleotide encoding NHREC under the control of an independent promoter or the retrovirus long terminal repeat (LTR) promoter, (ii) appropriate RNA packaging signals, and (iii) a Rev-responsive element (RRE) along with additional retrovirus cis-actmg RNA sequences and coding sequences required for efficient vector propagation. Retrovirus vectors (e.g., PFB and PFBNEO) are commercially available (Stratagene) and are based on published data (Riviere, I. et al. ( 1995) Proc. Natl. Acad. Sci. USA 92:6733-6737), incoφorated by reference herein. The vector is propagated in an appropriate vector producing cell line (VPCL) that expresses an envelope gene with a tropism for receptors on the target cells or a promiscuous envelope protein such as VSVg (Armentano, D. et al. (1987) J. Virol. 61 : 1647-1650; Bender, M.A. et al. ( 1987) J. Virol. 61 : 1639-1646; Adam, M.A. and A.D. Miller (1988) J. Virol. 62:3802-3806; Dull, T. et al. (1998) J. Virol. 72:8463-8471 ; Zufferey, R. et al. (1998) J. Virol. 72:9873-9880). U.S. Patent Number 5,910,434 to Rigg ("Method for obtaining retrovirus packaging cell lines producing high transducing efficiency retroviral supernatant") discloses a method for obtaining retrovirus packaging cell lines and is hereby incoφorated by reference. Propagation of retrovirus vectors, transduction of a population of cells (e.g., CD4 + T- cells), and the return of transduced cells to a patient are procedures well known to persons skilled in the art of gene therapy and have been well documented (Ranga, U et al (1997) J Virol 71 :7020- 7029, Bauer, G et al ( 1997) Blood 89:2259-2267, Bonyhadi, M L (1997) J Virol 71 :4707-4716, Ranga, U et al ( 1998) Proc Natl Acad Sci USA 95 1201-1206, Su, L ( 1997) Blood 89:2283- 2290) In the alternative, an adenovirus-based gene therapy delivery system is used to deliver polynucleotides encoding NHREC to cells which have one or more genetic abnormalities with respect to the expression of NHREC The construction and packaging of adenovirus-based vectors are well known to those with ordinary skill in the art Replication defective adenovirus vectors have proven to be versatile for importing genes encoding immunoregulatory proteins into intact islets in the pancreas (Csete, M E et al ( 1995) Transplantation 27 263-268) Potentially useful adenoviral vectors are described in U S Patent Number 5,707,618 to Armentano ("Adenovirus vectors for gene therapy"), hereby incoφorated by reference For adenoviral vectors, see also Antinozzi, P A et al ( 1999) Annu Rev Nutr 19 51 1 -544 and Verma, I M and N Somia ( 1997) Nature 18 389 239-242, both incoφorated by reference herein In another alternative, a heφes-based, gene therapy delivery system is used to deliver polynucleotides encoding NHREC to target cells which have one or more genetic abnormalities with respect to the expression of NHREC The use of heφes simplex virus (HSV)-based vectors may be especially valuable for introducing NHREC to cells of the central nervous system, for which HSV has a tropism The construction and packaging of heφes-based vectors are well known to those with ordinary skill in the art A replication-competent heφes simplex virus (HSV) type 1 -based vector has been used to deliver a reporter gene to the eyes of primates (Liu, X et al ( 1999) Exp Eye Res 169 385-395) The construction of a HSV-1 virus vector has also been disclosed in detail in U S Patent Number 5,804,413 to DeLuca ("Heφes simplex virus strains for gene transfer"), which is hereby incoφorated by reference U S Patent Number 5,804,413 teaches the use of recombinant HSV d92 which consists of a genome containing at least one exogenous gene to be transferred to a cell under the control of the appropriate promoter for puφoses including human gene therapy Also taught by this patent are the construction and use of recombinant HSV strains deleted for ICP4, ICP27 and ICP22 For HSV vectors, see also Goins, W F et al ( 1999) J Virol 73 519-532 and Xu, H et al (1994) Dev Biol 163 152-161 , hereby incoφorated by reference The manipulation of cloned heφesvirus sequences, the generation of recombinant virus following the transfection of multiple plasmids containing different segments of the large heφesvirus genomes, the growth and propagation of heφesvirus, and the infection of cells with heφesvirus are techniques well known to those of ordinary skill in the art In another alternative, an alphavirus (positive, single-stranded RNA virus) vector is used to deliver polynucleotides encoding NHREC to target cells The biology of the prototypic alphavirus, Semhki Forest Virus (SFV), has been studied extensively and gene transfer vectors have been based on the SFV genome (Garoff, H and K -J Lι (1998) Cuπ Opin Biotechnol 9 464-469) During alphavirus RNA replication, a subgenomic RNA is generated that normally encodes the viral capsid proteins This subgenomic RNA replicates to higher levels than the full length genomic RNA, resulting in the oveφroduction of capsid proteins relative to the viral proteins with enzymatic activity (e g , protease and polymerase) Similarly, inserting the coding sequence for NHREC into the alphavirus genome in place of the capsid-coding region results in the production of a large number of NHREC-coding RNAs and the synthesis of high levels of NHREC in vector transduced cells While alphavirus infection is typically associated with cell lysis within a few days, the ability to establish a persistent infection in hamster normal kidney cells (BHK-21) with a variant of Sindbis virus (SIN) indicates that the lytic replication of alphaviruses can be altered to suit the needs of the gene therapy application (Dryga, S A et al ( 1997) Virology 228 74-83) The wide host range of alphaviruses will allow the introduction of NHREC into a variety of cell types The specific transduction of a subset of cells in a population may require the sorting of cells prior to transduction The methods of manipulating infectious cDNA clones of alphaviruses, performing alphavirus cDNA and RNA transfections, and performing alphavirus infections, are well known to those with ordinary skill in the art Oligonucleotides derived from the transcription initiation site, e g , between about positions -10 and +10 from the start site, may also be employed to inhibit gene expression 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 Can, 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 πbosomes 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 πbozyme molecules may specifically and efficiently catalyze endonucleolytic cleavage of sequences encoding NHREC Specific πbozyme 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 πbonucleotides, coπesponding 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 NHREC. Such DNA sequences may be incoφorated 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. An additional embodiment of the invention encompasses a method for screening for a compound which is effective in altering expression of a polynucleotide encoding NHREC. Compounds which may be effective in altering expression of a specific polynucleotide may include, but are not limited to, oligonucleotides, antisense oligonucleotides, triple helix-forming oligonucleotides, transcription factors and other polypeptide transcriptional regulators, and non- macromolecular chemical entities which are capable of interacting with specific polynucleotide sequences. Effective compounds may alter polynucleotide expression by acting as either inhibitors or promoters of polynucleotide expression. Thus, in the treatment of disorders associated with increased NHREC expression or activity, a compound which specifically inhibits expression of the polynucleotide encoding NHREC may be therapeutically useful, and in the treament of disorders associated with decreased NHREC expression or activity, a compound which specifically promotes expression of the polynucleotide encoding NHREC may be therapeutically useful. At least one, and up to a plurality, of test compounds may be screened for effectiveness in altering expression of a specific polynucleotide. A test compound may be obtained by any method commonly known in the art, including chemical modification of a compound known to be effective in altering polynucleotide expression; selection from an existing, commercially-available or proprietary library of naturally-occurring or non-natural chemical compounds; rational design of a compound based on chemical and/or structural properties of the target polynucleotide; and selection from a library of chemical compounds created combinatorially or randomly. A sample comprising a polynucleotide encoding NHREC is exposed to at least one test compound thus obtained. The sample may comprise, for example, an intact or permeabihzed cell, or an in vitro cell-free or reconstituted biochemical system. Alterations in the expression of a polynucleotide encoding NHREC are assayed by any method commonly known in the art. Typically, the expression of a specific nucleotide is detected by hybridization with a probe having a nucleotide sequence complementary to the sequence of the polynucleotide encoding NHREC. The amount of hybridization may be quantified, thus forming the basis for a comparison of the expression of the polynucleotide both with and without exposure to one or more test compounds. Detection of a change in the expression of a polynucleotide exposed to a test compound indicates that the test compound is effective in altering the expression of the polynucleotide. A screen for a compound effective in altering expression of a specific polynucleotide can be caπied out, for example, using a Schizosaccharomyces pombe gene expression system (Atkins, D. et al. (1999) U.S. Patent No. 5,932,435; Arndt, G.M. et al. (2000) Nucleic Acids Res. 28:E15) or a human cell line such as HeLa cell (Clarke, M.L. et al. (2000) Biochem. Biophys. Res. Commun. 268:8-13). A particular embodiment of the present invention involves screening a combinatorial library of oligonucleotides (such as deoxyribonucleotides, ribonucleotides, peptide nucleic acids, and modified oligonucleotides) for antisense activity against a specific polynucleotide sequence (Bruice, T.W. et al. (1997) U.S. Patent No. 5,686,242; Bruice, T.W. et al. (2000) U.S. Patent No. 6,022,691). 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 composition which generally comprises an active ingredient formulated with a pharmaceutically acceptable excipient. Excipients may include, for example, sugars, starches, celluloses, gums, and proteins. Various formulations are commonly known and are thoroughly discussed in the latest edition of Remington's Pharmaceutical Sciences (Maack Publishing, Easton PA). Such compositions may consist of NHREC, antibodies to NHREC, and mimetics, agonists, antagonists, or inhibitors of NHREC. The 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, pulmonary, transdermal, subcutaneous, intraperitoneal, intranasal, enteral, topical, sublingual, or rectal means. Compositions for pulmonary administration may be prepared in liquid or dry powder form. These compositions are generally aerosolized immediately prior to inhalation by the patient. In the case of small molecules (e.g. traditional low molecular weight organic drugs), aerosol delivery of fast-acting formulations is well-known in the art. In the case of macromolecules (e.g. larger peptides and proteins), recent developments in the field of pulmonary delivery via the alveolar region of the lung have enabled the practical delivery of drugs such as insulin to blood circulation (see, e.g., Patton, J.S. et al., U.S. Patent No. 5,997,848). Pulmonary delivery has the advantage of administration without needle injection, and obviates the need for potentially toxic penetration enhancers. Compositions suitable for use in the invention include compositions wherein the active ingredients are contained in an effective amount to achieve the intended puφose. The determination of an effective dose is well within the capability of those skilled in the art. Specialized forms of compositions may be prepared for direct intracellular delivery of macromolecules comprising NHREC or fragments thereof. For example, liposome preparations containing a cell-impermeable macromolecule may promote cell fusion and intracellular delivery of the macromolecule. Alternatively, NHREC or a fragment thereof may be joined to a short cationic N- terminal portion from the HIV Tat-1 protein. Fusion proteins thus generated have been found to transduce into the cells of all tissues, including the brain, in a mouse model system (Schwarze, S.R. et al. (1999) Science 285: 1569-1572). 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, monkeys, 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 NHREC or fragments thereof, antibodies of NHREC, and agonists, antagonists or inhibitors of NHREC, 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 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 of the 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 of the active moiety or to maintain the desired effect Factors which may be taken into account include the seventy of the disease state, the general health of the subject, the age, weight, and gender of the subject, time and frequency of administration, drug combιnatιon(s), reaction sensitivities, and response to therapy Long-acting compositions may be administered every 3 to 4 days, every week, or biweekly depending on the half-life and clearance rate of the 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 NHREC may be used for the diagnosis of disorders characterized by expression of NHREC, or in assays to monitor patients being treated with NHREC or agonists, antagonists, or inhibitors of NHREC Antibodies useful for diagnostic puφoses may be prepared in the same manner as described above for therapeutics Diagnostic assays for NHREC include methods which utilize the antibody and a label to detect NHREC 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 vaπety of protocols for measuring NHREC, including ELISAs, RIAs, and FACS, are known in the art and provide a basis for diagnosing altered or abnormal levels of NHREC expression Normal or standard values for NHREC expression are established by combining body fluids or cell extracts taken from normal mammalian subjects, for example, human subjects, with antibodies to NHREC under conditions suitable for complex formation The amount of standard complex formation may be quantitated by vaπous methods, such as photometric means Quantities of NHREC 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 NHREC may be used for diagnostic puφoses. 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 NHREC may be coπelated with disease. The diagnostic assay may be used to determine absence, presence, and excess expression of NHREC, and to monitor regulation of NHREC levels during therapeutic intervention. In one aspect, hybridization with PCR probes which are capable of detecting polynucleotide sequences, including genomic sequences, encoding NHREC or closely related molecules may be used to identify nucleic acid sequences which encode NHREC. 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 NHREC, 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 NHREC 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:4-6 or from genomic sequences including promoters, enhancers, and introns of the NHREC gene. Means for producing specific hybridization probes for DNAs encoding NHREC include the cloning of polynucleotide sequences encoding NHREC or NHREC 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 35 S, or by enzymatic labels, such as alkaline phosphatase coupled to the probe via avidin/biotin coupling systems, and the like. Polynucleotide sequences encoding NHREC may be used for the diagnosis of disorders associated with expression of NHREC Examples of such disorders include, but are not limited to, a metabolic disorder such as Addison's disease, cerebrotendinous xanthomatosis, congenital adrenal hypeφlasia, coumarin resistance, cystic fibrosis, diabetes, fatty hepatociπhosis, fructose- 1 ,6-diphosphatase deficiency, galactosemia, goiter, glucagonoma, glycogen storage diseases, hereditary fructose intolerance, hyperadrenalism, hypoadrenalism, hypeφarathyroidism, hypoparathyroidism, hypercholesterolemia, hyperthyroidism, hypoglycemia, hypothyroidism, hyperlipidemia, hyperlipemia, lipid myopathies, lipodystrophies, lysosomal storage diseases, mannosidosis, neuraminidase deficiency, obesity, pentosuπa phenylketonuπa, and pseudovitamm D- deficiency rickets, an endocrine disorder such as a disorder of the hypothalamus and pituitary resulting from lesions such as pnmary brain tumors, an adenoma, infarction associated with pregnancy, hypophysectomy, aneurysms, vascular malformations, thrombosis, infections, immunological disorders, and complications due to head trauma, disorders associated with hypopituitaπsm including hypogonadism, Sheehan syndrome, diabetes insipidus, Kallman's disease, Hand-Schuller-Chπstian disease, Letterer-Siwe disease, sarcoidosis, empty sella syndrome, and dwarfism, disorders associated with hypeφituitaπsm including acromegaly, giantism, and syndrome of inappropriate antidiuretic hormone (ADH) secretion (SIADH) often caused by benign adenoma, disorders associated with hypothyroidism including goiter, myxedema, acute thyroiditis associated with bacteπal infection, subacute thyroiditis associated with viral infection, autoimmune thyroiditis (Hashimoto's disease), and cretinism, disorders associated with hyperthyroidism including thyrotoxicosis and its various forms, Grave's disease, pretibial myxedema, toxic multinodular goiter, thyroid carcinoma, and Plummer's disease, disorders associated with hypeφarathyroidism including Conn disease (chronic hypercalemia), pancreatic disorders such as Type I or Type II diabetes mellitus and associated complications, disorders associated with the adrenals such as hypeφlasia, carcinoma, or adenoma of the adrenal cortex, hypertension associated with alkalosis, amyloidosis, hypokalemia, Cushing's disease, Liddle's syndrome, and Arnold-Healy-Gordon syndrome, pheochromocytoma tumors, and Addison's disease, disorders associated with gonadal steroid hormones such as in women, abnormal prolactin production, infertility, endometriosis, perturbations of the menstrual cycle, polycystic ovarian disease, hypeφrolactmemia, isolated gonadotropin deficiency, amenoπhea, galactoπhea, hermaphroditism, hirsutism and viπhzation, breast cancer, and, in post-menopausal women, osteoporosis, and, in men, Leydig cell deficiency, male climacteric phase, and germinal cell aplasia, hypergonadal disorders associated with Leydig cell tumors, androgen resistance associated with absence of androgen receptors, syndrome of 5 α-reductase, and gynecomastia, a reproductive disorder such as a disorder of prolactin production, infertility, including tubal disease, ovulatory defects, and endometriosis, a disruption of the estrous cycle, a disruption of the menstrual cycle, polycystic ovary syndrome, ovarian hyperstimulation syndrome, an endometrial or ovarian tumor, a uteπne fibroid, autoimmune disorders, an ectopic pregnancy, and teratogenesis, cancer of the breast, fibrocystic breast disease, and galactoπhea, a disruption of spermatogenesis, abnormal sperm physiology, cancer of the testis, cancer of the prostate, benign prostatic hypeφlasia, prostatitis, Peyronie's disease, impotence, carcinoma of the male breast, and gynecomastia, a developmental disorder such as renal tubular acidosis, anemia, Cushing's syndrome, achondroplastic dwarfism, Duchenne and Becker muscular dystrophy, epilepsy, gonadal dysgenesis, WAGR syndrome (Wilms' tumor, aniπdia, genitourinary abnormalities, and mental retardation), Smith-Magenis syndrome, myelodysplastic syndrome, hereditary mucoepithelial dysplasia, hereditary keratodermas, hereditary neuropathies such as Charcot-Marie-Tooth disease and neurofibromatosis, hypothyroidism, hydrocephalus, seizure disorders such as Syndenham's chorea and cerebral palsy, spina bifida, anencephaly, craniorachischisis, congenital glaucoma, cataract, and sensorineural hearing loss; an immunological 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 polyendocrinopathy-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, iπitable bowel syndrome, multiple sclerosis, myasthenia gravis, myocardial or pericardial inflammation, osteoarthritis, osteoporosis, pancreatitis, polymyositis, psoriasis, Reiter's syndrome, rheumatoid arthritis, scleroderma, Sjogren's syndrome, systemic anaphylaxis, systemic lupus erythematosus, systemic sclerosis, thrombocytopenic puφura, ulcerative colitis, uveitis, Werner syndrome, complications of cancer, hemodialysis, and extracoφoreal circulation, viral, bacterial, fungal, parasitic, protozoal, and helminthic infections, and trauma; and a cell proliferative disorder such as actinic keratosis, arteriosclerosis, atherosclerosis, bursitis, ciπhosis, 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 maπow, brain, breast, cervix, gall bladder, ganglia, gastrointestinal tract, heart, kidney, liver, lung, muscle, ovary, pancreas, parathyroid, penis, prostate, salivary glands, skin, spleen, testis, thy us, thyroid, and uterus. The polynucleotide sequences encoding NHREC may be used in Southern or northern analysis, dot blot, or other membrane-based technologies; in PCR technologies; in dipstick, pin, and multiformat ELISA-like assays; and in microaπays utilizing fluids or tissues from patients to detect altered NHREC expression. Such qualitative or quantitative methods are well known in the art. In a particular aspect, the nucleotide sequences encoding NHREC may be useful in assays that detect the presence of associated disorders, particularly those mentioned above. The nucleotide sequences encoding NHREC 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 NHREC 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 NHREC, 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 NHREC, 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 of the cancer. Additional diagnostic uses for oligonucleotides designed from the sequences encoding NHREC may involve the use of PCR. These oligomers may be chemically synthesized, generated enzymatically, or produced in vitro. Oligomers will preferably contain a fragment of a polynucleotide encoding NHREC, or a fragment of a polynucleotide complementary to the polynucleotide encoding NHREC, 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. In a particular aspect, oligonucleotide primers derived from the polynucleotide sequences encoding NHREC may be used to detect single nucleotide polymoφhisms (SNPs). SNPs are substitutions, insertions and deletions that are a frequent cause of inherited or acquired genetic disease in humans. Methods of SNP detection include, but are not limited to, single-stranded conformation polymoφhism (SSCP) and fluorescent SSCP (fSSCP) methods. In SSCP, oligonucleotide pnmers derived from the polynucleotide sequences encoding NHREC are used to amplify DNA using the polymerase chain reaction (PCR) The DNA may be derived, for example, from diseased or normal tissue, biopsy samples, bodily fluids, and the like SNPs in the DNA cause differences in the secondary and tertiary structures of PCR products in single-stranded form, and these differences are detectable using gel electrophoresis in non-denaturing gels In fSCCP, the oligonucleotide primers are fiuorescently labeled, which allows detection of the amphmers in high- throughput equipment such as DNA sequencing machines Additionally, sequence database analysis methods, termed in silico SNP (isSNP), are capable of identifying polymoφhisms by comparing the sequence of individual overlapping DNA fragments which assemble into a common consensus sequence These computer-based methods filter out sequence variations due to laboratory preparation of DNA and sequencing eπors using statistical models and automated analyses of DNA sequence chromatograms In the alternative, SNPs may be detected and characterized by mass spectrometry using, for example, the high throughput MASSARRAY system (Sequenom, Inc , San Diego CA) Methods which may also be used to quantify the expression of NHREC include radiolabehng or biotinylating nucleotides, coamplification of a control nucleic acid, and mteφolating 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 ohgomer or polynucleotide of interest is presented in various dilutions and a spectrophotometπc or coloπmetπc response gives rapid quantitation. In further embodiments, oligonucleotides or longer fragments derived from any of the polynucleotide sequences described herein may be used as elements on a microaπay The microaπay can be used in transcript imaging techniques which monitor the relative expression levels of large numbers of genes simultaneously as described below The microaπay may also be used to identify genetic variants, mutations, and polymoφhisms. This information may be used to determine gene function, to understand the genetic basis of a disorder, to diagnose a disorder, to monitor progression/regression of disease as a function of gene expression, and to develop and monitor the activities of therapeutic agents in the treatment of disease. In particular, this information may be used to develop a pharmacogenomic profile of a patient in order to select the most appropriate and effective treatment regimen for that patient For example, therapeutic agents which are highly effective and display the fewest side effects may be selected for a patient based on his/her pharmacogenomic profile. In another embodiment, NHREC, fragments of NHREC, or antibodies specific for NHREC may be used as elements on a microaπay. The microaπay may be used to monitor or measure protein-protein interactions, drug-target interactions, and gene expression profiles, as described above. A particular embodiment relates to the use of the polynucleotides of the present invention to generate a transcript image of a tissue or cell type. A transcript image represents the global pattern of gene expression by a particular tissue or cell type. Global gene expression patterns are analyzed by quantifying the number of expressed genes and their relative abundance under given conditions and at a given time. (See Seilhamer et al., "Comparative Gene Transcript Analysis," U.S. Patent Number 5,840,484, expressly incoφorated by reference herein.) Thus a transcript image may be generated by hybridizing the polynucleotides of the present invention or their complements to the totality of transcripts or reverse transcripts of a particular tissue or cell type. In one embodiment, the hybridization takes place in high-throughput format, wherein the polynucleotides of the present invention or their complements comprise a subset of a plurality of elements on a microaπay. The resultant transcript image would provide a profile of gene activity. Transcript images may be generated using transcripts isolated from tissues, cell lines, biopsies, or other biological samples. The transcript image may thus reflect gene expression in vivo, as in the case of a tissue or biopsy sample, or in vitro, as in the case of a cell line. Transcript images which profile the expression of the polynucleotides of the present invention may also be used in conjunction with in vitro model systems and preclinical evaluation of pharmaceuticals, as well as toxicological testing of industrial and naturally-occuπing environmental compounds. All compounds induce characteristic gene expression patterns, frequently termed molecular fingeφrints or toxicant signatures, which are indicative of mechanisms of action and toxicity (Nuwaysir, E.F. et al. (1999) Moi. Carcinog. 24: 153-159; Steiner, S. and N.L. Anderson (2000) Toxicol. Lett. 1 12-113:467-471 , expressly incoφorated by reference herein). If a test compound has a signature similar to that of a compound with known toxicity, it is likely to share those toxic properties. These fingeφrints or signatures are most useful and refined when they contain expression information from a large number of genes and gene families. Ideally, a genome-wide measurement of expression provides the highest quality signature. Even genes whose expression is not altered by any tested compounds are important as well, as the levels of expression of these genes are used to normalize the rest of the expression data. The normalization procedure is useful for comparison of expression data after treatment with different compounds. While the assignment of gene function to elements of a toxicant signature aids in inteφretation of toxicity mechanisms, knowledge of gene function is not necessary for the statistical matching of signatures which leads to prediction of toxicity. (See, for example, Press Release 00-02 from the National Institute of Environmental Health Sciences, released February 29, 2000, available at http://www.niehs.nih.gov/oc/news/toxchip.htm.) Therefore, it is important and desirable in toxicological screening using toxicant signatures to include all expressed gene sequences. In one embodiment, the toxicity of a test compound is assessed by treating a biological sample containing nucleic acids with the test compound. Nucleic acids that are expressed in the treated biological sample are hybridized with one or more probes specific to the polynucleotides of the present invention, so that transcript levels corresponding to the polynucleotides of the present invention may be quantified. The transcript levels in the treated biological sample are compared with levels in an untreated biological sample. Differences in the transcript levels between the two samples are indicative of a toxic response caused by the test compound in the treated sample. Another particular embodiment relates to the use of the polypeptide sequences of the present invention to analyze the proteome of a tissue or cell type. The term proteome refers to the global pattern of protein expression in a particular tissue or cell type. Each protein component of a proteome can be subjected individually to further analysis. Proteome expression patterns, or profiles, are analyzed by quantifying the number of expressed proteins and their relative abundance under given conditions and at a given time. A profile of a cell's proteome may thus be generated by separating and analyzing the polypeptides of a particular tissue or cell type. In one embodiment, the separation is achieved using two-dimensional gel electrophoresis, in which proteins from a sample are separated by isoelectric focusing in the first dimension, and then according to molecular weight by sodium dodecyl sulfate slab gel electrophoresis in the second dimension (Steiner and Anderson, supra). The proteins are visualized in the gel as discrete and uniquely positioned spots, typically by staining the gel with an agent such as Coomassie Blue or silver or fluorescent stains. The optical density of each protein spot is generally proportional to the level of the protein in the sample. The optical densities of equivalently positioned protein spots from different samples, for example, from biological samples either treated or untreated with a test compound or therapeutic agent, are compared to identify any changes in protein spot density related to the treatment. The proteins in the spots are partially sequenced using, for example, standard methods employing chemical or enzymatic cleavage followed by mass spectrometry. The identity of the protein in a spot may be determined by comparing its partial sequence, preferably of at least 5 contiguous amino acid residues, to the polypeptide sequences of the present invention. In some cases, further sequence data may be obtained for definitive protein identification. A proteomic profile may also be generated using antibodies specific for NHREC to quantify the levels of NHREC expression. In one embodiment, the antibodies are used as elements on a microaπay, and protein expression levels are quantified by exposing the microaπay to the sample and detecting the levels of protein bound to each aπay element (Lueking, A. et al. (1999) Anal. Biochem. 270:103-11 1 ; Mendoze, L.G. et al. (1999) Biotechniques 27:778-788). Detection may be performed by a variety of methods known in the art, for example, by reacting the proteins in the sample with a thiol- or amino-reactive fluorescent compound and detecting the amount of fluorescence bound at each aπay element Toxicant signatures at the proteome level are also useful for toxicological screening, and should be analyzed in parallel with toxicant signatures at the transcript level There is a poor coπelation between transcript and protein abundances for some proteins in some tissues (Anderson, N L and J Seilhamer (1997) Electrophoresis 18 533-537), so proteome toxicant signatures may be useful in the analysis of compounds which do not significantly affect the transcript image, but which alter the proteomic profile In addition, the analysis of transcripts in body fluids is difficult, due to rapid degradation of mRNA, so proteomic profiling may be more reliable and informative in such cases In another embodiment, the toxicity of a test compound is assessed by treating a biological sample containing proteins with the test compound Proteins that are expressed in the treated biological sample are separated so that the amount of each protein can be quantified The amount of each protein is compared to the amount of the coπesponding protein in an untreated biological sample A difference in the amount of protein between the two samples is indicative of a toxic response to the test compound in the treated sample Individual proteins are identified by sequencing the amino acid residues of the individual proteins and comparing these partial sequences to the polypeptides of the present invention In another embodiment, the toxicity of a test compound is assessed by treating a biological sample containing proteins with the test compound Proteins from the biological sample are incubated with antibodies specific to the polypeptides of the present invention The amount of protein recognized by the antibodies is quantified The amount of protein in the treated biological sample is compared with the amount in an untreated biological sample A difference in the amount of protein between the two samples is indicative of a toxic response to the test compound in the treated sample 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 ) Various types of microaπays are well known and thoroughly described in DNA Microarrays A Practical Approach, M Schena, ed (1999) Oxford University Press, London, hereby expressly incoφorated by reference In another embodiment of the invention, nucleic acid sequences encoding NHREC may be used to generate hybridization probes useful in mapping the naturally occuπing genomic sequence Either coding or noncoding sequences may be used, and in some instances, noncoding sequences may be preferable over coding sequences For example, conservation of a coding sequence among members of a multi-gene family may potentially cause undesired cross hybridization during chromosomal mapping. 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., Haπington, J.J. et al. (1997) Nat. Genet. 15:345-355; Price, CM. (1993) Blood Rev. 7: 127-134; and Trask, B . (1991) Trends Genet. 7: 149-154.) Once mapped, the nucleic acid sequences of the invention may be used to develop genetic linkage maps, for example, which correlate the inheritance of a disease state with the inheritance of a particular chromosome region or restriction fragment length polymoφhism (RFLP). (See, for example, Lander, E.S. and D. Botstein (1986) Proc. Natl. Acad. Sci. USA 83:7353- 7357.) Fluorescent in situ hybridization (FISH) may be coπelated with other physical 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. Coπelation between the location of the gene encoding NHREC on a physical map and a specific disorder, or a predisposition to a specific disorder, may help define the region of DNA associated with that disorder and thus may further positional cloning efforts. 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 exact chromosomal locus is not known. This information is valuable to investigators searching for disease genes using positional cloning or other gene discovery techniques. Once the gene or genes responsible for a disease or syndrome have 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 instant invention may also be used to detect differences in the chromosomal location due to translocation, inversion, etc., among normal, earner, or affected individuals. In another embodiment of the invention, NHREC, 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 NHREC 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 NHREC, or fragments thereof, and washed. Bound NHREC is then detected by methods well known in the art. Purified NHREC 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 NHREC specifically compete with a test compound for binding NHREC In this manner, antibodies can be used to detect the presence of any peptide which shares one or more antigenic determinants with NHREC. In additional embodiments, the nucleotide sequences which encode NHREC 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 cuπently 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 embodiments are, therefore, to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever. The disclosures of all patents, applications and publications, mentioned above and below, in particular U.S. Ser. No. 60/178,578, U.S. Ser. No. 60/185,079, and U.S. Ser. No. 60/189,999, are expressly incoφorated by reference herein. EXAMPLES I. Construction of cDNA Libraries Incyte cDNAs were derived from cDNA libraries described in the LIFESEQ GOLD database (Incyte Genomics, Palo Alto CA) and shown in Table 4, column 5. Some tissues were homogenized and lysed in guanidinium isothiocyanate, while others were homogenized and lysed in phenol or in a suitable mixture of denaturants, such as TRIZOL (Life Technologies), a monophasic solution of phenol and guanidine isothiocyanate. The resulting lysates were centrifuged over CsCl cushions or extracted with chloroform. RNA was precipitated from the lysates with either isopropanol or sodium acetate and ethanol, or by other routine methods. Phenol extraction and precipitation of RNA were repeated as necessary to increase RNA purity. In some cases, RNA was treated with DNase. For most libraries, poly(A)+ RNA was isolated using oligo d(T)-coupled paramagnetic particles (Promega), OLIGOTEX latex particles (QIAGEN, Chatsworth CA), or an OLIGOTEX mRNA purification kit (QIAGEN). Alternatively, RNA was isolated directly from tissue lysates using other RNA isolation kits, e.g., the POLY(A)PURE mRNA purification kit (Ambion, Austin TX). In some cases, Stratagene was provided with RNA and constructed the corresponding cDNA libraries. Otherwise, cDNA was synthesized and cDNA libraries were constructed with the UNIZAP vector system (Stratagene) or SUPERSCRIPT plasmid system (Life Technologies), using the recommended procedures or similar methods known in the art. (See, e.g., Ausubel, 1997, supra, units 5.1-6.6.) Reverse transcription was initiated using oligo d(T) or random primers. Synthetic oligonucleotide adapters were ligated to double stranded cDNA, and the cDNA was digested with the appropriate restriction enzyme or enzymes. For most libraries, the cDNA was size-selected (300- 1000 bp) using SEPHACRYL S 1000, SEPH AROSE CL2B , or SEPHAROSE CL4B column chromatography (Amersham Pharmacia Biotech) or preparative agarose gel electrophoresis. cDNAs were ligated into compatible restriction enzyme sites of the polylinker of a suitable plasmid, e.g., PBLUESCRIPT plasmid (Stratagene), PSPORT1 plasmid (Life Technologies), PCDNA2.1 plasmid (Invitrogen, Carlsbad CA), PBK-CMV plasmid (Stratagene), or pINCY (Incyte Genomics, Palo Alto CA), or derivatives thereof. Recombinant plasmids were transformed into competent E. coli cells including XLl-Blue, XLl-BlueMRF, or SOLR from Stratagene or DH5α, DH10B, or ElectroMAX DH10B from Life Technologies. II. Isolation of cDNA Clones Plasmids obtained as described in Example I 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.B. (1994) Anal. Biochem. 216: 1-14). Host cell lysis and thermal cycling steps were caπied 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 Incyte cDNA recovered in plasmids as described in Example II were sequenced as follows. Sequencing reactions were processed using standard methods or high-throughput instrumentation such as the ABI CATALYST 800 (Applied Biosystems) 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 (Applied Biosystems). Electrophoretic separation of cDNA sequencing reactions and detection of labeled polynucleotides were caπied out using the MEGABACE 1000 DNA sequencing system (Molecular Dynamics); the ABI PRISM 373 or 377 sequencing system (Applied Biosystems) 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 7.7). Some of the cDNA sequences were selected for extension using the techniques disclosed in Example VIII. The polynucleotide sequences derived from Incyte cDNAs were validated by removing vector, linker, and poly(A) sequences and by masking ambiguous bases, using algorithms and programs based on BLAST, dynamic programming, and dinucleotide nearest neighbor analysis. The Incyte cDNA sequences or translations thereof 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 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, for example, Eddy, S.R. (1996) Cuπ. Opin. Struct. Biol. 6:361-365.) The queries were performed using programs based on BLAST, FASTA, BLIMPS, and HMMER. The Incyte cDNA sequences were assembled to produce full length polynucleotide sequences. Alternatively, GenBank cDNAs, GenBank ESTs, stitched sequences, stretched sequences, or Genscan-predicted coding sequences (see Examples IV and V) were used to extend Incyte cDNA assemblages to full length. Assembly was performed using programs based on Phred, Phrap, and Consed, and cDNA assemblages were screened for open reading frames using programs based on GeneMark, BLAST, and FASTA. The full length polynucleotide sequences were translated to derive the coπesponding full length polypeptide sequences. Alternatively, a polypeptide of the invention may begin at any of the methionine residues of the full length translated polypeptide. Full length polypeptide sequences were subsequently analyzed by querying against databases such as the GenBank protein databases (genpept), SwissProt, BLOCKS, PRINTS, DOMO, PRODOM, Prosite, and hidden Markov model (HMM)-based protein family databases such as PFAM. Full length polynucleotide sequences are also analyzed using MACDNASIS PRO software (Hitachi Software Engineering, South San Francisco CA) and LASERGENE software (DNASTAR). Polynucleotide and polypeptide sequence alignments are generated using 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. Table 7 summarizes the tools, programs, and algorithms used for the analysis and assembly of Incyte cDNA and full length sequences and provides applicable descriptions, references, and threshold parameters. The first column of Table 7 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 or the lower the probability value, the greater the identity between two sequences). The programs described above for the assembly and analysis of full length polynucleotide and polypeptide sequences were also used to identify polynucleotide sequence fragments from SEQ ID NO:4-6. Fragments from about 20 to about 4000 nucleotides which are useful in hybridization and amplification technologies are described in Table 4, column 4. IV. Identification and Editing of Coding Sequences from Genomic DNA Putative nuclear hormone receptors were initially identified by running the Genscan gene identification program against public genomic sequence databases (e.g., gbpri and gbhtg). Genscan is a general-puφose gene identification program which analyzes genomic DNA sequences from a variety of organisms (See Burge, C. and S. Karlin (1997) J. Moi. Biol. 268:78-94, and Burge, C. and S. Karlin (1998) Cuπ. Opin. Struct. Biol. 8:346-354). The program concatenates predicted exons to form an assembled cDNA sequence extending from a methionine to a stop codon. The output of Genscan is a FASTA database of polynucleotide and polypeptide sequences. The maximum range of sequence for Genscan to analyze at once was set to 30 kb. To determine which of these Genscan predicted cDNA sequences encode nuclear hormone receptors, the encoded polypeptides were analyzed by querying against PFAM models for nuclear hormone receptors. Potential nuclear hormone receptors were also identified by homology to Incyte cDNA sequences that had been annotated as nuclear hormone receptors. These selected Genscan-predicted sequences were then compared by BLAST analysis to the genpept and gbpri public databases. Where necessary, the Genscan-predicted sequences were then edited by comparison to the top BLAST hit from genpept to coπect eπors in the sequence predicted by Genscan, such as extra or omitted exons. BLAST analysis was also used to find any Incyte cDNA or public cDNA coverage of the Genscan-predicted sequences, thus providing evidence for transcription. When Incyte cDNA coverage was available, this information was used to correct or confirm the Genscan predicted sequence. Full length polynucleotide sequences were obtained by assembling Genscan-predicted coding sequences with Incyte cDNA sequences and or public cDNA sequences using the assembly process described in Example III. Alternatively, full length polynucleotide sequences were derived entirely from edited or unedited Genscan-predicted coding sequences. V. Assembly of Genomic Sequence Data with cDNA Sequence Data "Stitched" Sequences Partial cDNA sequences were extended with exons predicted by the Genscan gene identification program described in Example Pv\ Partial cDNAs assembled as described in Example HI were mapped to genomic DNA and parsed into clusters containing related cDNAs and Genscan exon predictions from one or more genomic sequences. Each cluster was analyzed using an algorithm based on graph theory and dynamic programming to integrate cDNA and genomic information, generating possible splice variants that were subsequently confirmed, edited, or extended to create a full length sequence. Sequence intervals in which the entire length of the interval was present on more than one sequence in the cluster were identified, and intervals thus identified were considered to be equivalent by transitivity. For example, if an interval was present on a cDNA and two genomic sequences, then all three intervals were considered to be equivalent. This process allows unrelated but consecutive genomic sequences to be brought together, bridged by cDNA sequence. Intervals thus identified were then "stitched" together by the stitching algorithm in the order that they appear along their parent sequences to generate the longest possible sequence, as well as sequence variants. Linkages between intervals which proceed along one type of parent sequence (cDNA to cDNA or genomic sequence to genomic sequence) were given preference over linkages which change parent type (cDNA to genomic sequence). The resultant stitched sequences were translated and compared by BLAST analysis to the genpept and gbpri public databases. Incoπect exons predicted by Genscan were coπected by comparison to the top BLAST hit from genpept. Sequences were further extended with additional cDNA sequences, or by inspection of genomic DNA, when necessary. "Stretched" Sequences Partial DNA sequences were extended to full length with an algorithm based on BLAST analysis. First, partial cDNAs assembled as described in Example III were queried against public databases such as the GenBank primate, rodent, mammalian, vertebrate, and eukaryote databases using the BLAST program. The nearest GenBank protein homolog was then compared by BLAST analysis to either Incyte cDNA sequences or GenScan exon predicted sequences described in Example IV. A chimeric protein was generated by using the resultant high-scoring segment pairs (HSPs) to map the translated sequences onto the GenBank protein homolog. Insertions or deletions may occur in the chimeric protein with respect to the original GenBank protein homolog. The GenBank protein homolog, the chimeric protein, or both were used as probes to search for homologous genomic sequences from the public human genome databases. Partial DNA sequences were therefore "stretched" or extended by the addition of homologous genomic sequences. The resultant stretched sequences were examined to determine whether it contained a complete gene. VI. Chromosomal Mapping of NHREC Encoding Polynucleotides The sequences which were used to assemble SEQ ID NO:4-6 were compared with sequences from the Incyte LIFESEQ database and public domain databases using BLAST and other implementations of the Smith-Waterman algorithm. Sequences from these databases that matched SEQ ID NO:4-6 were assembled into clusters of contiguous and overlapping sequences using assembly algorithms such as Phrap (Table 7). Radiation hybrid and genetic mapping data available from public resources such as the Stanford Human Genome Center (SHGC), Whitehead Institute for Genome Research (WIGR), and Genethon were used to determine if any of the clustered sequences had been previously mapped. Inclusion of a mapped sequence in a cluster resulted in the assignment of all sequences of that cluster, including its particular SEQ ID NO:, to that map location. Map locations are represented by ranges, or intervals, or human chromosomes. The map position of an interval, in centiM organs, is measured relative to the terminus of the chromosome's p- arm. (The centiMorgan (cM) is a unit of measurement based on recombination frequencies between chromosomal markers. On average, 1 cM is roughly equivalent to 1 megabase (Mb) of DNA in humans, although this can vary widely due to hot and cold spots of recombination.) The cM distances are based on genetic markers mapped by Genethon which provide boundaries for radiation hybrid markers whose sequences were included in each of the clusters. Human genome maps and other resources available to the public, such as the NCBI "GeneMap'99" World Wide Web site (http://www.ncbi.nlm.nih.gov/genemap/), can be employed to determine if previously identified disease genes map within or in proximity to the intervals indicated above. VII. Analysis of Polynucleotide Expression 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 cDNA databases such as GenBank or LIFESEQ (Incyte Genomics). 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 of the search is the product score, which is defined as: BLAST Score x Percent Identity 5 x minimum {length(Seq. 1), length(Seq. 2) j The product score takes into account both the degree of similarity between two sequences and the length of the sequence match. The product score is a normalized value between 0 and 100, and is calculated as follows: the BLAST score is multiplied by the percent nucleotide identity and the product is divided by (5 times the length of the shorter of the two sequences). The BLAST score is calculated by assigning a score of +5 for every base that matches in a high-scoring segment pair (HSP), and -4 for every mismatch. Two sequences may share more than one HSP (separated by gaps). If there is more than one HSP, then the pair with the highest BLAST score is used to calculate the product score. The product score represents a balance between fractional overlap and quality in a BLAST alignment. For example, a product score of 100 is produced only for 100% identity over the entire length of the shorter of the two sequences being compared. A product score of 70 is produced either by 100% identity and 70% overlap at one end, or by 88% identity and 100% overlap at the other. A product score of 50 is produced either by 100% identity and 50% overlap at one end, or 79% identity and 100% overlap. Alternatively, polynucleotide sequences encoding NHREC are analyzed with respect to the tissue sources from which they were derived. For example, some full length sequences are assembled, at least in part, with overlapping Incyte cDNA sequences (see Example III). Each cDNA sequence is derived from a cDNA library constructed from a human tissue. Each human tissue is classified into one of the following organ/tissue categories: cardiovascular system; connective tissue; digestive system; embryonic structures; endocrine system; exocrine glands; genitalia, female; genitalia, male; germ cells; hemic and immune system; liver; musculoskeletal system; nervous system; pancreas; respiratory system; sense organs; skin; stomatognathic system; unclassified/mixed; or urinary tract. The number of libraries in each category is counted and divided by the total number of libraries across all categories. Similarly, each human tissue is classified into one of the following disease/condition categories: cancer, cell line, developmental, inflammation, neurological, trauma, cardiovascular, pooled, and other, and the number of libraries in each category is counted and divided by the total number of libraries across all categories. The resulting percentages reflect the tissue- and disease-specific expression of cDNA encoding NHREC. cDNA sequences and cDNA library/tissue information are found in the LIFESEQ GOLD database (Incyte Genomics, Palo Alto CA). VIII. Extension of NHREC Encoding Polynucleotides Full length polynucleotide sequences were also 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 was synthesized to initiate 3' extension of the 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 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 4 ) 2 S0 4 , and 2-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 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 WI), and sonicated or sheared prior to religation into pUC 18 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, and 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 (Applied Biosystems). In like manner, full length polynucleotide sequences are verified using the above procedure or are used to obtain 5' regulatory sequences using the above procedure along with oligonucleotides designed for such extension, and an appropriate genomic library. IX. Labeling and Use of Individual Hybridization Probes Hybridization probes derived from SEQ ID NO:4-6 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 of the 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 transfeπed 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. X. Microarrays The linkage or synthesis of array elements upon a microaπay can be achieved utilizing photolithography, piezoelectric printing (ink-jet printing, See, e.g., Baldeschweiler, supra.), mechanical microspotting technologies, and derivatives thereof. The substrate in each of the aforementioned technologies should be uniform and solid with a non-porous surface (Schena (1999), supra). Suggested substrates include silicon, silica, glass slides, glass chips, and silicon wafers. Alternatively, a procedure 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 aπay may be produced using available methods and machines well known to those of ordinary skill in the art and may contain any appropriate number of elements. (See, e.g., Schena, M. et al. (1995) Science 270:467-470; Shalon, D. et al. ( 1996) Genome Res. 6:639-645; Marshall, A. and J. Hodgson (1998) Nat. Biotechnol. 16:27-31.) Full length cDNAs, Expressed Sequence Tags (ESTs), or fragments or oligomers thereof may comprise the elements of the microarray. Fragments or oligomers suitable for hybridization can be selected using software well known in the art such as LASERGENE software (DNASTAR). The aπay elements are hybridized with polynucleotides in a biological sample. The polynucleotides in the biological sample are conjugated to a fluorescent label or other molecular tag for ease of detection. After hybridization, nonhybridized nucleotides from the biological sample are removed, and a fluorescence scanner is used to detect hybridization at each aπay element. Alternatively, laser desorbtion and mass spectrometry may be used for detection of hybridization. The degree of complementarity and the relative abundance of each polynucleotide which hybridizes to an element on the microaπay may be assessed. In one embodiment, microaπay preparation and usage is described in detail below. Tissue or Cell Sample Preparation Total RNA is isolated from tissue samples using the guanidinium thiocyanate method and poly(A) + RNA is purified using the oligo-(dT) cellulose method. Each poly(A) + RNA sample is reverse transcribed using MMLV reverse-transcriptase, 0.05 pg/μl oligo-(dT) primer (21mer), IX first strand buffer, 0.03 units/μl RNase inhibitor, 500 μM dATP, 500 μM dGTP, 500 μM dTTP, 40 μM dCTP, 40 μM dCTP-Cy3 (BDS) or dCTP-Cy5 (Amersham Pharmacia Biotech). The reverse transcription reaction is performed in a 25 ml volume containing 200 ng poly(A) + RNA with GEMBRIGHT kits (Incyte). Specific control poly(A) + RNAs are synthesized by in vitro transcription from non-coding yeast genomic DNA. After incubation at 37° C for 2 hr, each reaction sample (one with Cy3 and another with Cy5 labeling) is treated with 2.5 ml of 0.5M sodium hydroxide and incubated for 20 minutes at 85° C to the stop the reaction and degrade the RNA. Samples are purified using two successive CHROMA SPIN 30 gel filtration spin columns (CLONTECH Laboratories, Inc. (CLONTECH), Palo Alto CA) and after combining, both reaction samples are ethanol precipitated using 1 ml of glycogen (1 mg/ml), 60 ml sodium acetate, and 300 ml of 100% ethanol. The sample is then dried to completion using a SpeedVAC (Savant Instruments Inc., Holbrook NY) and resuspended in 14 μl 5X SSC/0.2% SDS. Microarray Preparation Sequences of the present invention are used to generate aπay elements. Each aπay element is amplified from bacterial cells containing vectors with cloned cDNA inserts. PCR amplification uses primers complementary to the vector sequences flanking the cDNA insert. Aπay elements are amplified in thirty cycles of PCR from an initial quantity of 1-2 ng to a final quantity greater than 5 μg. Amplified aπay elements are then purified using SEPHACRYL-400 (Amersham Pharmacia Biotech). Purified array elements are immobilized on polymer-coated glass slides. Glass microscope slides (Corning) are cleaned by ultrasound in 0.1 % SDS and acetone, with extensive distilled water washes between and after treatments. Glass slides are etched in 4% hydrofluoric acid (VWR Scientific Products Coφoration (VWR), West Chester PA), washed extensively in distilled water, and coated with 0.05% aminopropyl silane (Sigma) in 95% ethanol. Coated slides are cured in a 1 10°C oven. Array elements are applied to the coated glass substrate using a procedure described in US Patent No. 5,807,522 , incoφorated herein by reference. 1 μl of the aπay element DNA, at an average concentration of 100 ng/μl, is loaded into the open capillary printing element by a high-speed robotic apparatus. The apparatus then deposits about 5 nl of aπay element sample per slide. Microaπays are UV-crosslinked using a STRATALINKER UV-crosslinker (Stratagene). Microaπays are washed at room temperature once in 0.2% SDS and three times in distilled water. Non-specific binding sites are blocked by incubation of microaπays in 0.2% casein in phosphate buffered saline (PBS) (Tropix, Inc., Bedford MA) for 30 minutes at 60° C followed by washes in 0.2% SDS and distilled water as before. Hybridization Hybridization reactions contain 9 μl of sample mixture consisting of 0.2 μg each of Cy3 and Cy5 labeled cDNA synthesis products in 5X SSC, 0.2% SDS hybridization buffer. The sample mixture is heated to 65° C for 5 minutes and is aliquoted onto the microaπay surface and covered with an 1.8 cm 2 coverslip. The aπays are transfeπed to a wateφroof chamber having a cavity just slightly larger than a microscope slide. The chamber is kept at 100% humidity internally by the addition of 140 μl of 5X SSC in a corner of the chamber. The chamber containing the aπays is incubated for about 6.5 hours at 60°C The aπays are washed for 10 min at 45°C in a first wash buffer (IX SSC, 0.1% SDS), three times for 10 minutes each at 45° C in a second wash buffer (0.1X SSC), and dried. Detection Reporter-labeled hybridization complexes are detected with a microscope equipped with an Innova 70 mixed gas 10 W laser (Coherent, Inc., Santa Clara CA) capable of generating spectral lines at 488 nm for excitation of Cy3 and at 632 nm for excitation of Cy5. The excitation laser light is focused on the array using a 20X microscope objective (Nikon, Inc., Melville NY). The slide containing the array is placed on a computer-controlled X-Y stage on the microscope and raster- scanned past the objective. The 1.8 cm x 1.8 cm array used in the present example is scanned with a resolution of 20 micrometers. In two separate scans, a mixed gas multiline laser excites the two fluorophores sequentially. Emitted light is split, based on wavelength, into two photomultiplier tube detectors (PMT R1477, Hamamatsu Photonics Systems, Bridgewater NJ) coπesponding to the two fluorophores. Appropriate filters positioned between the aπay and the photomultiplier tubes are used to filter the signals. The emission maxima of the fluorophores used are 565 nm for Cy3 and 650 nm for Cy5. Each aπay is typically scanned twice, one scan per fluorophore using the appropriate filters at the laser source, although the apparatus is capable of recording the spectra from both fluorophores simultaneously. The sensitivity of the scans is typically calibrated using the signal intensity generated by a cDNA control species added to the sample mixture at a known concentration. A specific location on the aπay contains a complementary DNA sequence, allowing the intensity of the signal at that location to be coπelated with a weight ratio of hybridizing species of 1 : 100,000. When two samples from different sources (e.g., representing test and control cells), each labeled with a different fluorophore, are hybridized to a single aπay for the puφose of identifying genes that are differentially expressed, the calibration is done by labeling samples of the calibrating cDNA with the two fluorophores and adding identical amounts of each to the hybridization mixture. The output of the photomultiplier tube is digitized using a 12-bit RTI-835H analog-to-digital (A/D) conversion board (Analog Devices, Inc., Norwood MA) installed in an IBM-compatible PC computer. The digitized data are displayed as an image where the signal intensity is mapped using a linear 20-color transformation to a pseudocolor scale ranging from blue (low signal) to red (high signal). The data is also analyzed quantitatively. Where two different fluorophores are excited and measured simultaneously, the data are first coπected for optical crosstalk (due to overlapping emission spectra) between the fluorophores using each fluorophore' s emission spectrum. A grid is superimposed over the fluorescence signal image such that the signal from each spot is centered in each element of the grid. The fluorescence signal within each element is then integrated to obtain a numerical value coπesponding to the average intensity of the signal. The software used for signal analysis is the GEMTOOLS gene expression analysis program (Incyte). XI. Complementary Polynucleotides Sequences complementary to the NHREC -encoding sequences, or any parts thereof, are used to detect, decrease, or inhibit expression of naturally occuπing NHREC. 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 NHREC. 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 NHREC-encoding transcript. XII. Expression of NHREC Expression and purification of NHREC is achieved using bacterial or virus-based expression systems. For expression of NHREC 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 NHREC upon induction with isopropyl beta-D- thiogalactopyranoside (IPTG). Expression of NHREC in eukaryotic cells is achieved by infecting insect or mammalian cell lines with recombinant Autographica califomica nuclear polyhedrosis virus (AcMNPV), commonly known as baculovirus. The nonessential polyhedrin gene of baculovirus is replaced with cDNA encoding NHREC 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 of the 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, NHREC 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 japonicum, 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 NHREC 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 NHREC obtained by these methods can be used directly in the assays shown in Examples XVI and XVII, where applicable. XIII. Functional Assays NHREC function is assessed by expressing the sequences encoding NHREC 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 Cytometry, Oxford, New York NY. The influence of NHREC on gene expression can be assessed using highly purified populations of cells transfected with sequences encoding NHREC 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 NHREC and other genes of interest can be analyzed by northern analysis or microaπay techniques. XIV. Production of NHREC Specific Antibodies NHREC substantially purified using polyacrylamide gel electrophoresis (PAGE; see, e.g., Haπington, M.G. (1990) Methods Enzymol. 182:488-495), or other purification techniques, is used to immunize rabbits and to produce antibodies using standard protocols. Alternatively, the NHREC amino acid sequence is analyzed using LASERGENE software (DNASTAR) to determine regions of high immunogenicity, and a coπesponding ohgopeptide 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 (Applied Biosystems) 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-NHREC activity by, for example, binding the peptide or NHREC to a substrate, blocking with 1 % BSA, reacting with rabbit antisera, washing, and reacting with radio-iodinated goat anti-rabbit IgG. XV. Purification of Naturally Occurring NHREC Using Specific Antibodies Naturally occurring or recombinant NHREC is substantially purified by immunoaffinity chromatography using antibodies specific for NHREC. An immunoaffinity column is constructed by covalently coupling anti-NHREC 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 NHREC are passed over the immunoaffinity column, and the column is washed under conditions that allow the preferential absorbance of NHREC (e.g., high ionic strength buffers in the presence of detergent). The column is eluted under conditions that disrupt antibody/NHREC 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 NHREC is collected. XVI. Identification of Molecules Which Interact with NHREC NHREC, or biologically active fragments thereof, are labeled with 125 I Bolton-Hunter reagent. (See, e.g., Bolton A.E. and W.M. Hunter (1973) Biochem. J. 133:529-539.) Candidate molecules previously aπayed in the wells of a multi-well plate are incubated with the labeled NHREC, washed, and any wells with labeled NHREC complex are assayed. Data obtained using different concentrations of NHREC are used to calculate values for the number, affinity, and association of NHREC with the candidate molecules. Alternatively, molecules interacting with NHREC are analyzed using the yeast two-hybrid system as described in Fields, S. and O. Song (1989) Nature 340:245-246, or using commercially available kits based on the two-hybrid system, such as the MATCHMAKER system (Clontech). NHREC may also be used in the PATHCALLING process (CuraGen Coφ., New Haven CT) which employs the yeast two-hybrid system in a high-throughput manner to determine all interactions between the proteins encoded by two large libraries of genes (Nandabalan, K et al (2000) U S Patent No 6,057,101) XVII. Demonstration of NHREC Activity An assay for receptor activity of NHREC is based on a prototypical assay for hgand/receptor- mediated modulation of cell proliferation This assay measures the amount of newly synthesized DNA in Swiss mouse 3T3 cells expressing NHREC An appropriate mammalian expression vector containing cDNA encoding NHREC is added to quiescent 3T3 cultured cells using transfection methods well known m the art The transfected cells are incubated in the presence of [ 3 H]thymιdιne and varying amounts of NHREC ligand Incoφoration of [ 3 H]thymιdιne into acid-precipitable DNA is measured over an appropriate time interval using a tritium radioisotope counter, and the amount incoφorated is directly proportional to the amount of newly synthesized DNA A linear dose- response curve over at least a hundred-fold NHREC ligand concentration range is indicative of receptor activity One unit of activity per milhhter is defined as the concentration of NHREC producing a 50% response level, where 100% represents maximal incoφoration of [ H]thymιdιne into acid-precipitable DNA (See, e g , McKay, I and I Leigh, eds (1993) Growth Factors A Practical Approach, Oxford University Press, New York NY, p 73 ) Alternatively, receptor activity of NHREC is measured by the increase in cell proliferation resulting from transformation of a mammalian cell line such as COS7, HeLa or CHO with an eukaryotic expression vector encoding NHREC Eukaryotic expression vectors are commercially available, and the techniques to introduce them into cells are well known to those skilled in the art The cells are incubated for 48-72 hours after transformation under conditions appropriate for the cell line to allow expression of NHREC Phase microscopy is then used to compare the mitotic index of transformed versus control cells An increase in the mitotic index is an indication of receptor activity of NHREC Alternatively, receptor activity of NHREC is determined in a ligand-binding assay using candidate ligand molecules in the presence of 125 I-labeled NHREC NHREC is labeled with 125 I Bolton-Hunter reagent (Bolton and Hunter, supra) Candidate ligand molecules previously aπayed in the wells of a multi-well plate are incubated with the labeled NHREC, washed, and any wells with labeled NHREC complex are assayed Data obtained using different concentrations of NHREC are used to calculate values for the number, affinity, and association of NHREC with the ligand molecules The level of binding measured is proportional to the level of NHREC activity Transcriptional regulatory activity of NHREC is measured by its ability to stimulate transcription of a reporter gene (Liu, H Y et al (1997) EMBO J 16 5289-5298) The assay entails the use of a well characterized reporter gene construct, LexA op -LacZ, that consists of LexA DNA transcriptional control elements (LexA op ) fused to sequences encoding the E coli LacZ enzyme The methods for constructing and expressing fusion genes, introducing them into cells, and measuring LacZ enzyme activity, are well known to those skilled in the art. Sequences encoding NHREC are cloned into a plasmid that directs the synthesis of a fusion protein, LexA-NHREC, consisting of NHREC and a DNA-binding domain derived from the LexA transcription factor. The resulting plasmid, encoding a LexA-NHREC fusion protein, is introduced into yeast cells along with a plasmid containing the LexA op -LacZ reporter gene. The amount of LacZ enzyme activity associated with LexA-NHREC transfected cells, relative to control cells, is proportional to the amount of transcription stimulated by the NHREC. 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 Table 2 Table 3 Table 4 Table 5 oo t Table 6 Table 7 Program Description Reference Parameter Threshold ABI FACTURA A program that 1 emoves vectoi sequences and masks Applied Biosystems, Fostei City, CA ambiguous bases in nucleic acid sequences ABI/PARACEL A Fast Data Findei useful in compai ing and annotating Applied Biosystems, Foster City, CA, Mismatch <50% FDF amino acid or nucleic acid sequences Paiacel Inc , Pasadena, CA ABI AutoAssembler A program that assembles nucleic acid sequences Applied Biosystems, Foster City, CA BLAST A Basic Local Alignment Seaich Tool useful in sequence Altschul, S F et al (1990) J Moi Biol ESTs Probability value= 1 0E 8 o similaπty search foi 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 blastx, tblastn, and tblastx value= 1 0E 10 oi less FASTA A Peaison and Lipman algonthm that searches foi Pearson, W R and D J Lipman (1988) Proc ESTs fasta E value=l 06E-6 similarity between a query sequence and a group of Natl Acad Sci USA 85 2444-2448, Pearson, Assembled ESTs fasta Identιty= sequences of the same type FASTA comprises as least W R (1990) Methods Enzymol 183 63-98, 95% or greater and five functions fasta, tfasta, fastx, ttastx, and ssearch and Smith, T F and M S Waterman (1981) Match length=200 bases or greatei Adv Appl Math 2 482-489 fastx E value=l 0E-8 oi less Full Length sequences fastx score=100 or greater BLIMPS A BLocks IMProved Searchei that matches a sequence Henikoff, S and J G Henikoff (1991) Nucleic Piobabi ty value= 1 0E-3 QI less against those in BLOCKS, PRINTS, DOMO, PRODOM, Acids Res 19 6565-6572, Henikoff, J G and and PFAM databases to search for gene families, sequence S Henikoff (1996) Methods Enzymol homology, and stiuctural fingerprint legions 266 88-105, and Attwood, T K et al (1997) J Chem Inf Comput Sci 37 417-424 HMMER An algorithm foi searching a query sequence against Krogh, A et al (1994) J Moi Biol , PFAM hits Piobabihty value= hidden Mai kov model (HMM)-based databases of protein 235 1501-1531 , Sonnhammei , E L L et al 1 0E-3 oi less family consensus sequences, such as PFAM (1988) Nucleic Acids Res 26 320-322, Signal peptide hits Scores 0 oi Durbin, R et al (1998) Our World View, in a gi eater Nutshell, Cambridge Univ Press, pp 1-350 Table 7 (cont.) Program Description Reference Parameter Threshold PiofileScan An algorithm that searches for structural and sequence Gribskov, M et al (1988) CABIOS 4 61-66, Normalized quality score≥GC motifs in piotein sequences that match sequence patterns Gπbskov, M et al (1989) Methods Enzymol specified "HIGH" value for t defined in Piosite 183 146-159, Banoch, A et al (1997) Nucleic particular Prosite motif Acids Res 25 217-221 Generally, score=l 4-2 1 Phied A base calling algouthm that examines automated Ewing, B et al (1998) Genome Res sequencer traces with high sensitivity and piobabihty 8 175-185, Ewιng, B and P Green (1998) Genome Res 8 186 194 Phrap A Phils Revised Assembly Piogram including SWAT and Smith, T F and M S Waterman (1981) Adv Appl Score= 120 or gieatei, CiossMatch, programs based on efficient implementation Math 2 482-489, Smith, T F and M S Waterman Match length= 56 oi greater of the Smith Wateiman algorithm, useful m searching (1981) J Moi Biol 147 195 197, and Green, P , sequence homology and assembling DNA sequences University of Washington, Seattle, WA Consed A graphical tool for viewing and editing Phrap assemblies Gordon, D et al (1998) Genome Res 8 195-202 SPScan A weight matrix analysis program that scans protein Nielson, H et al (1997) Protein Engineering 10 1 Score=3 5 or greater sequences for the presence of secretory signal peptides 6, Claveπe, J M and S Audic (1997) CABIOS 12 431-439 TMAP A piogiam that uses weight mati ices to delineate Persson, B and P Argos (1994) J Moi Biol tiansmembiane segments on piotein sequences and 237 182-192, Persson, B and P Aigos (1996) detei mine onentation Protein Sci 5 363-371 TMHMMER A piogiam that uses a hidden Mai kov model (HMM) to Sonnhammei , E L et al ( 1998) Pi oc Sixth Intl delineate transmembiane segments on protein sequences Conf on Intelligent Systems for Moi Biol , and detei mine onentation Glasgow et al , eds , The Am Assoc foi Artificial Intelligence Pi ess, Menlo Pai k, C A, pp 175-182 Motifs A pi ogram that searches amino acid sequences for patterns Bairoch, A et al (1997) Nucleic Acids Res 25 217-221 , that matched those defined in Prosite Wisconsin Package Program Manual, version 9, page M51-59, Genetics Computer Group, Madison, WI

Claims: What is claimed is 1 An isolated polypeptide compπsing an amino acid sequence selected from the group consisting of a) an ammo acid sequence selected from the group consisting of SEQ ID NO 1-3, b) a naturally occumng amino acid sequence having at least 90% sequence identity to an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, c) a biologically active fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3, and d) an immunogenic fragment of an amino acid sequence selected from the group consisting of SEQ ID NO 1-3 2 An isolated polypeptide of claim 1 selected from the group consisting of SEQ ID NO 1-3 3 An isolated polynucleotide encoding a polypeptide of claim 1 4 An isolated polynucleotide encoding a polypeptide of claim 2 5 An isolated polynucleotide of claim 4 selected from the group consisting of SEQ ID NO 4-6 6 A recombinant polynucleotide comprising a promoter sequence operably linked to a polynucleotide of claim 3 7 A cell transformed with a recombinant polynucleotide of claim 6 8 A transgenic organism compπsing a recombinant polynucleotide of claim 6 9 A method for producing a polypeptide of claim 1 , the method compπsing a) culturing a cell under conditions suitable for expression of the polypeptide, wherein said cell is transformed with a recombinant polynucleotide, and said recombinant polynucleotide comprises a promoter sequence operably linked to a polynucleotide encoding the polypeptide of claim 1 , and b) recoveπng the polypeptide so expressed 10 An isolated antibody which specifically binds to a polypeptide of claim 1 1 1 An isolated polynucleotide compπsing a polynucleotide sequence selected from the group consisting of a) a polynucleotide sequence selected from the group consisting of SEQ ID NO 4-6, b) a naturally occurring polynucleotide sequence having at least 90% sequence identity to a polynucleotide sequence selected from the group consisting of SEQ ID NO 4-6, c) a polynucleotide sequence complementary to a), d) a polynucleotide sequence complementary to b), and e) an RNA equivalent of a)-d) 12 An isolated polynucleotide compπsing at least 60 contiguous nucleotides of a polynucleotide of claim 1 1 13 A method for detecting a target polynucleotide m a sample, said target polynucleotide having a sequence of a polynucleotide of claim 1 1 , the method comprising a) hybridizing the sample with a probe compπsing at least 20 contiguous nucleotides comprising a sequence complementary to said target polynucleotide in the sample, and which probe specifically hybndizes to said target polynucleotide, under conditions whereby a hybπdization complex is formed between said probe and said target polynucleotide or fragments thereof, and b) detecting the presence or absence of said hybridization complex, and, optionally, if present, the amount thereof 14 A method of claim 13, wherein the probe comprises at least 60 contiguous nucleotides 15 A method for detecting a target polynucleotide in a sample, said target polynucleotide having a sequence of a polynucleotide of claim 1 1, the method comprising a) amplifying said target polynucleotide or fragment thereof using polymerase chain reaction amplification, and b) detecting the presence or absence of said amplified target polynucleotide or fragment thereof, and, optionally, if present, the amount thereof 16 A composition comprising an effective amount of a polypeptide of claim 1 and a pharmaceutically acceptable excipient 17. A composition of claim 16, wherein the polypeptide comprises an amino acid sequence selected from the group consisting of SEQ ID NO: 1-3. 18. A method for treating a disease or condition associated with decreased expression of functional NHREC, comprising administering to a patient in need of such treatment the composition of claim 16. 19. A method for screening a compound for effectiveness as an agonist of a polypeptide of claim 1 , the method comprising: a) exposing a sample comprising a polypeptide of claim 1 to a compound, and b) detecting agonist activity in the sample. 20. A composition comprising an agonist compound identified by a method of claim 19 and a pharmaceutically acceptable excipient. 21. A method for treating a disease or condition associated with decreased expression of functional NHREC, comprising administering to a patient in need of such treatment a composition of claim 20. 22. A method for screening a compound for effectiveness as an antagonist of a polypeptide of claim 1 , the method comprising: a) exposing a sample comprising a polypeptide of claim 1 to a compound, and b) detecting antagonist activity in the sample. 23. A composition comprising an antagonist compound identified by a method of claim 22 and a pharmaceutically acceptable excipient. 24. A method for treating a disease or condition associated with overexpression of functional NHREC, comprising administering to a patient in need of such treatment a composition of claim 23. 25. A method of screening for a compound that specifically binds to the polypeptide of claim 1, said method comprising the steps of: a) combining the polypeptide of claim 1 with at least one test compound under suitable conditions, and b) detecting binding of the polypeptide of claim 1 to the test compound, thereby identifying a compound that specifically binds to the polypeptide of claim 1. 26. A method of screening for a compound that modulates the activity of the polypeptide of claim 1 , said method comprising: a) combining the polypeptide of claim 1 with at least one test compound under conditions permissive for the activity of the polypeptide of claim 1, b) assessing the activity of the polypeptide of claim 1 in the presence of the test compound, and c) comparing the activity of the polypeptide of claim 1 in the presence of the test compound with the activity of the polypeptide of claim 1 in the absence of the test compound, wherein a change in the activity of the polypeptide of claim 1 in the presence of the test compound is indicative of a compound that modulates the activity of the polypeptide of claim 1. 27. A method for screening a compound for effectiveness in altering expression of a target polynucleotide, wherein said target polynucleotide comprises a sequence of claim 5, the method comprising: a) exposing a sample comprising the target polynucleotide to a compound, under conditions suitable for the expression of the target polynucleotide, b) detecting altered expression of the target polynucleotide, and c) comparing the expression of the target polynucleotide in the presence of varying amounts of the compound and in the absence of the compound. 28. A method for assessing toxicity of a test compound, said method comprising: a) treating a biological sample containing nucleic acids with the test compound; b) hybridizing the nucleic acids of the treated biological sample with a probe comprising at least 20 contiguous nucleotides of a polynucleotide of claim 11 under conditions whereby a specific hybridization complex is formed between said probe and a target polynucleotide in the biological sample, said target polynucleotide comprising a polynucleotide sequence of a polynucleotide of claim 11 or fragment thereof; c) quantifying the amount of hybridization complex; and d) comparing the amount of hybridization complex in the treated biological sample with the amount of hybridization complex in an untreated biological sample, wherein a difference in the amount of hybridization complex in the treated biological sample is indicative of toxicity of the test compound.

Inventors: BANDMAN OLGA, BAUGHN MARIAH R, BURFORD NEIL, DAS DEBOPRIYA, LO TERENCE P, POLICKY JENNIFER L, TANG Y TOM, TRIBOULEY CATHERINE M, BANDMAN, OLGA, BAUGHN, MARIAH, R., BURFORD, NEIL, DAS, DEBOPRIYA, LO, TERENCE, P., POLICKY, JENNIFER, L., TANG, Y. TOM, TRIBOULEY, CATHERINE, M.
Applicants: BANDMAN OLGA, BAUGHN MARIAH R, BURFORD NEIL, DAS DEBOPRIYA, INCYTE GENOMICS INC, LO TERENCE P, POLICKY JENNIFER L, TANG Y TOM, TRIBOULEY CATHERINE M, BANDMAN, OLGA, BAUGHN, MARIAH, R., BURFORD, NEIL, DAS, DEBOPRIYA, INCYTE GENOMICS, INC., LO, TERENCE, P., POLICKY, JENNIFER, L., TANG, Y. TOM, TRIBOULEY, CATHERINE, M.
Application year: 2001
Main classification: C12N15
IPC codes: A61K38, A61K45, A61P3, A61P5, A61P15, A61P35, A61P37, C07K14, C07K16, C12N1, C12N5, C12N15, C12P21, C12Q1, G01N33