NOVEL HUMAN GROWTH FACTORS

Abstract: The present invention relates to huXAG-1, huXAG-2 and huXAG-3 proteins which are novel human growth factors. These proteins share homology with the XAG protein of Xenopus laevis and can be found in colon tissue. huXAG-1 is specifically found in cancerous colon cells and may therefore be a growth factor for colon cancer. In particular, isolated nucleic acid molecules are provided encoding the huXAG-1, huXAG-2 and huXAG-3 proteins. huXAG-1, huXAG-2 and huXAG-3 polypeptides are also provided as are vectors, host cells and recombinant methods for producing the same. The invention further relates to screening methods for identifying agonists and antagonists of huXAG-1, huXAG-2 or huXAG-3 activity as well as diagnostic and therapeutic uses of the proteins.

Description: Novel Human Growth Factors Background of the Invention Field of the Invention The present invention relates to novel human growth factors More specifically, isolated nucleic acid molecules are provided encoding huXAG-1, huXAG-2, and huXAG-3 HuXAG-1, huXAG-2, and huXAG-3 polypeptides are also provided, as are vectors, host cells and recombinant methods for producing the same The invention further relates to screening methods for identifying agonists and antagonists of huXAG-1, huXAG-2, and huXAG-3 activity, as well as diagnostic and therapeutic uses of huXAG-1, huXAG-2 and huXAG-3 Related Art Growth factors Control of cell division is a basic aspect of multicellular existence that depends upon a programmed series of events One factor in cellular proliferation and its control that has been identified is the presence of various polypeptide growth factors Growth factors are essential components of growth media for in vitro cell culture and are involved in cell survival in vivo Some of the growth factors that have been identified to date include PDGF (platelet-derived growth factor) implicated in the repair of the vascular system in vivo, EGF (epidermal growth factor) which acts as a mitogen for cells of ectodermal and mesodermal origin; TGF-α (transforming growth factor) which acts as a mitogen similarly to EGF but can make normal cells grow in agar, TGF-β (transforming growth factor) which is a mitogen for some cells and a growth inhibitor for others, and NGF (nerve growth factor) involved in the development and maintenance of sympathetic and embryonic neurons Watson et al, Molecular Biology of the Gene, p 975 (Benjamin/Cummings 1987) It is clear that particular cell types require particular growth factors Peptide growth factors are produced and secreted from a variety of tissues The target cells are typically located close to the site of release of the growth factor (paracrine response) In addition to their growth promoting and differentiation- inducing activities, growth factors elicit a wide variety of effects in their target cells and are involved in processes such as inflammation, immune reactions and wound repair See, Pimentel, E Handbook of Growth Factors, Volume 1: General Basics (CRC Press 1 94) Monitoring of growth factor gene expression in cells of various human tissue, would be useful in detecting and studying abnormal hypertrophy both vitro and in vivo In addition, monitoring for higher than normal expression of tissue-specific growth factors would be useful in early diagnosis of certain cancers Additionally, polypeptide growth factors are very important cell culture reagents for stimulating cellular growth and aiding survival of the cells in vitro The search continues to exist for polypeptides that stimulate and/or inhibit growth of particular cells for both in vitro and in vivo uses In addition, the search continues for novel tissue specific markers that can be employed qualitatively to help identify a particular cell or tissue type and employed qualitatively to assess whether cells, tissues or organs are abnormal in their expression of a particular polypeptide At the front of the larvae in most frog species lies a small and sticky patch of cells, called the cement gland The cement gland lies anterior to the brain and any other neural tissue and develops from the embryonic ectoderm (Drysdale et al., Dev. Growth Differ. 34 51-59 (1992)) Formation of the cement gland is influenced by multiple signals (Sive et al., Dev. Dy . 205 265-280 ( 1996)) One such signal is the XAG protein, which is expressed at very high levels in the cement gland and at lower levels in the more posterior hatching gland It encodes a secreted protein later expressed in the pharynx (Jamrich et al , Development 105 779-786 (1989)) and in the lung primordiu Colorectal carcinoma Colorectal carcinoma is a cancer which affects many people per year The prognosis is poor in about 50% of the cases because the tumor is often not detected until the disease has spread and has reached a terminal stage Early diagnosis is important to increase chances of arresting the carcinoma before it metastasizes, thereby leading to an improved prognosis One method of early tumor diagnosis is detection of the presence of a marker or antigen specific for a particular tumor These normally proteinaceous markers are synthesized by the tumor, and may be found in the serum and/or on the surface of the tumor Only a limited number of tumor markers for colorectal carcinoma have thus far been found to have clinical use These include carcinoembryonic antigen (CEA), and the sialyated Lewis a antigen (CA 19 9) Unfortunately, approximately 40% of patients whose condition has been accurately diagnosed as colorectal carcinoma do not have elevated plasma levels of either of these antigens when initially examined There is a need for commercially available serodiagnostic markers which can be used to detect the tumor and to monitor therapy for this group Another method of diagnosis involves detecting the presence of a gene associated with a particular disease or condition A need exists for genetic markers which can be detected by genetic screening tests for the early detection of colon cancer in high risk patients Accordingly, it is an object of this invention to provide a new marker for the detection of colorectal carcinoma It is another object of the invention to provide a new marker suitable for diagnosing and monitoring colorectal cancer Such novel marker can be further used to make novel antibodies or other antagonists that bind the colon cancer specific polypeptides to diagnose cancer and to bind and inhibit the biological function of the polypeptide A further object of the present invention is to provide a method and kit for the detection and monitoring of colorectal carcinoma in patients using assay methods specific for markers associated with colorectal carcinoma cells Summary of the Invention The present invention provides a novel group of isolated nucleic acid molecules that encode for human growth factors The growth factors are small secreted proteins that exhibit a good degree of sequence similarity to one another The present invention provides isolated nucleic acid molecules comprising a polynucleotide encoding the huXAG-1 (also referred to as colon cancer-specific gene (CCSG)) polypeptide having the amino acid sequence shown in SEQ ID NO.2 or the amino acid sequence encoded by the cDNA clone deposited in a bacterial host as ATCC Deposit Number 97641 on June 27, 1996 The nucleotide sequence was determined by sequencing the deposited huXAG-1 clone and is shown in SEQ ID NO 1 The sequence contains an open reading frame encoding a polypeptide of about 175 amino acid residues, with a leader sequence of about 20 amino acid residues, and a predicted molecular weight of about 20 I Da The amino acid sequence of mature huXAG-1 is shown in SEQ ID NO 2 (amino acid residues from about 1 to about 155 in SEQ ID NO:2) Thus, one aspect of the invention provides an isolated nucleic acid molecule comprising a polynucleotide having a nucleotide sequence selected from the group consisting of (a) a nucleotide sequence encoding the huXAG-1 polypeptide having the complete amino acid sequence in SEQ ID NO.2, (b) a nucleotide sequence encoding the huXAG-1 polypeptide having the complete a ino acid sequence in SEQ ID NO.2 but minus the N-terminal methionine residue, (c) a nucleotide sequence encoding the mature huXAG-1 having the amino acid sequence at positions from about 1 to about 155 in SEQ ID NO.2, (d) a nucleotide sequence encoding the huXAG- 1 polypeptide having the complete amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 97641 , (e) a nucleotide sequence encoding the mature huXAG- 1 polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 97641, and (f) a nucleotide sequence complementary to any of the nucleotide sequences in (a), (b), (c), (d), or (e) above The present invention also provides isolated nucleic acid molecules comprising a polynucleotide encoding the huXAG-2 polypeptide having the amino acid sequence shown in SEQ LD NO 4 or the amino acid sequence encoded by the cDNA deposited as ATCC Deposit Number 209134 on June 27, 1997 The nucleotide sequence determined by sequencing the deposited huXAG-2 clone, which is shown in SEQ ID NO 3, contains an open reading frame encoding a polypeptide of about 172 amino acid residues, with a leader sequence of about 23 amino acid residues The amino acid sequence of the mature huXAG-2 is shown in SEQ ID NO 4 (amino acid residues from about 1 to about 149 in SEQ ID NO.4) Thus, another aspect of the invention provides an isolated nucleic acid molecule comprising a polynucleotide having a nucleotide sequence selected from the group consisting of (a) a nucleotide sequence encoding the huXAG-2 polypeptide having the complete amino acid sequence in SEQ ID NO 4, (b) a nucleotide sequence encoding the huXAG-2 polypeptide having the complete amino acid sequence in SEQ ID NO 4 but minus the N-terminal methionine residue, (c) a nucleotide sequence encoding the mature huXAG-2 having the amino acid sequence at positions from about 1 to about 149 in SEQ ID NO 4, (d) a nucleotide sequence encoding the huXAG-2 polypeptide having the complete amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 209134, (e) a nucleotide sequence encoding the mature huXAG-2 polypeptide having the amino acid sequence encoded by the cD A clone contained in ATCC Deposit No. 209134; and (f) a nucleotide sequence complementary to any of the nucleotide sequences in (a), (b), (c), (d), or (e) above. The present invention also provides isolated nucleic acid molecules comprising a polynucleotide encoding the huXAG-3 polypeptide having the amino acid sequence shown in SEQ ID NO.6 or the amino acid sequence encoded by the cDNA deposited as ATCC Deposit Number 209137 on July 3, 1997. The nucleotide sequence determined by sequencing the deposited huXAG-3 clone, which is shown in SEQ ID NO: 5, contains an open reading frame encoding a polypeptide of about 166 amino acid residues, with a leader sequence of about 23 amino acid residues. The amino acid sequence of the mature huXAG-3 receptor is shown in SEQ ED NO:6 (amino acid residues from about 1 to about 143 in SEQ ID NO: 6) Thus, another aspect of the invention provides an isolated nucleic acid molecule comprising a polynucleotide having a nucleotide sequence selected from the group consisting of: (a) a nucleotide sequence encoding the huXAG-3 polypeptide having the complete amino acid sequence in SEQ ID NO 6; (b) a nucleotide sequence encoding the huXAG-3 polypeptide having the complete amino acid sequence in SEQ ID NO:6 but minus the N-terminal methionine residue; (c) a nucleotide sequence encoding the mature huXAG-3 having the amino acid sequence at positions from about 1 to about 143 in SEQ ID NO:6; (d) a nucleotide sequence encoding the huXAG-3 polypeptide having the complete amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 209137 ; (e) a nucleotide sequence encoding the mature huXAG-3 polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No. 209137; and (f) a nucleotide sequence complementary to any of the nucleotide sequences in (a), (b), (c), (d), or (e) above. Further embodiments of the invention include isolated nucleic acid molecules that comprise a polynucleotide having a nucleotide sequence at least 95% identical, and more preferably at least 96%, 97%, 98% or 99% identical, to any of the nucleotide sequences of huXAG-1, huXAG-2 or huXAG-3 in (a), (b), (c), (d), (e), or (f), above, or a polynucleotide which hybridizes under stringent hybridization conditions to a polynucleotide in (a), (b), (c), (d), (e), or (f), above This polynucleotide which hybridizes does not hybridize under stringent hybridization conditions to a polynucleotide having a nucleotide sequence consisting of only A residues or of only T residues An additional nucleic acid embodiment of the invention relates to an isolated nucleic acid molecule comprising a polynucleotide which encodes the amino acid sequence of an epitope-bearing portion of a huXAG-1, huXAG-2, or huXAG-3 polypeptide having an amino acid sequence in (a), (b), (c), (d), or (e), above The present invention also relates to recombinant vectors, which include the isolated nucleic acid molecules of the present invention, and to host cells containing the recombinant vectors, as well as to methods of making such vectors and host cells and for using them for production of huXAG-1 , huXAG-2, or huXAG-3 polypeptides or peptides by recombinant techniques The invention further provides an isolated huXAG- 1 polypeptide having an amino acid sequence selected from the group consisting of (a) the amino acid sequence of the huXAG-1 polypeptide having the complete 175 amino acid sequence, including the leader sequence shown in SEQ ID NO 2, (b) the amino acid sequence of the huXAG-1 polypeptide having the complete 175 amino acid sequence, including the leader sequence shown in SEQ ID NO.2 but minus the N-terminal methionine residue, (c) the amino acid sequence of the mature huXAG-1 polypeptide (without the leader) having the amino acid sequence at positions 1-155 in SEQ ID NO.2; (d) the amino acid sequence of the huXAG-1 polypeptide having the complete amino acid sequence, including the leader, encoded by the cDNA clone contained in ATCC Deposit No 97641 , and (e) the amino acid sequence of the mature huXAG- 1 polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 97641 The invention further provides an isolated huXAG-2 polypeptide having an amino acid sequence selected from the group consisting of (a) the amino acid sequence of the huXAG-2 polypeptide having the complete 172 amino acid sequence, including the leader sequence shown in SEQ ID NO 4, (b) the amino acid sequence of the huXAG-2 polypeptide having the complete 172 amino acid sequence, including the leader sequence shown in SEQ ID NO 4 but minus the N-terminal methionine residue, (c) the amino acid sequence of the mature huXAG-2 polypeptide (without the leader) having the amino acid sequence at positions 1-149 in SEQ ID NO 4; (d) the amino acid sequence of the huXAG-2 polypeptide having the complete amino acid sequence, including the leader, encoded by the cDNA clone contained in ATCC Deposit No 209134, and (e) the amino acid sequence of the mature huXAG-2 polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 209134 The invention also provides an isolated huXAG-3 polypeptide having an amino acid sequence selected from the group consisting of (a) the amino acid sequence of the huXAG-3 polypeptide having the complete 166 amino acid sequence, including the leader sequence shown in SEQ ID NO 6, (b) the amino acid sequence of the huXAG-3 polypeptide having the complete 166 amino acid sequence, including the leader sequence shown in SEQ ID NO 6 but minus the N-terminal methionine residue, (c) the amino acid sequence of the mature huXAG-3 polypeptide (without the leader) having the amino acid sequence at positions 1-143 in SEQ ID NO 6, (d) the amino acid sequence of the huXAG-3 polypeptide having the complete amino acid sequence, including the leader, encoded by the cDNA clone contained in ATCC Deposit No 209137, and (e) the amino acid sequence of the mature huXAG-3 polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 209137 The polypeptides of the present invention also include polypeptides having an amino acid sequence at least 95% identical, and more preferably at least 96%, 97%, 98% or 99% identical to the huXAG-1 , huXAG-2 or huXAG-3 polypeptides described above An additional embodiment of this aspect of the invention relates to a peptide or polypeptide which has the amino acid sequence of an epitope-bearing portion of a huXAG-1, huXAG-2 or huXAG-3 polypeptide having an amino acid sequence described in (a), (b), (c), (d), or (e), above. Peptides or polypeptides having the amino acid sequence of an epitope-bearing portion of a huXAG-1, huXAG-2 or huXAG-3 polypeptide of the invention include portions of such polypeptides with at ieast six or seven, preferably at least nine, and more preferably at least about 30 amino acids to about 50 amino acids. It is understood that epitope-bearing polypeptides of any length up to and including the entire amino acid sequence of a polypeptide of the invention described above also are included in the invention. In another embodiment, the invention provides an isolated antibody that binds specifically to a huXAG-1, huXAG-2 or huXAG-3 polypeptide having an amino acid sequence described in (a), (b), (c), (d), or (e) above The invention further provides methods for isolating antibodies that bind specifically to a huXAG- 1 , huXAG-2 or huXAG-3 polypeptide having an amino acid sequence as described herein. Such antibodies are useful diagnostically or therapeutically as describe below. The present invention also provides a screening method for identifying compounds capable of enhancing or inhibiting a cellular response induced by huXAG-1, huXAG-2 or huXAG-3 protein which involves contacting cells which express huXAG-1, huXAG-2 or huXAG-3 protein with the candidate compound, assaying a cellular response, and comparing the cellular response to a standard cellular response, the standard being assayed when contact is made in absence of the candidate compound; whereby, an increased cellular response over the standard indicates that the compound is an agonist and a decreased cellular response over the standard indicates that the compound is an antagonist. A method for detecting and monitoring human colorectal carcinoma is based upon the discovery of the gene encoding huXAG-1. This protein was found to be expressed in cells derived from a human colon carcinoma, but not in other human tissues. In a first embodiment the method measures the level of huXAG-1 mRNA expression in a biological sample, preferably a tissue biopsy, and compares the measurement to a standard value. Levels of mRNA expression may be assayed by a variety of well-known methods, including Northern blot analysis, SI nuclease mapping and polymerase chain reaction (PCR) In a second embodiment, the method for detecting and monitoring human colorectal carcinoma includes contacting a biological sample with an antibody or portion thereof which reacts with huXAG-1, an analog, or portion thereof, and observing if the antibody reacts with the sample The biological sample may be whole blood, serum, ascites fluid, a tissue biopsy, a tumor, a tissue culture, or a histological preparation thereof The antibody may be raised to huXAG-1 polypeptide, or to analogs or antigenic portions thereof More specifically, this antibody may be a polyclonal or monoclonal antibody, or analog or portion thereof, which preferably does not cross-react with CE NCA, CA 19 9, alpha- 1- acid glycoprotein, or with the blood group substances A, B, and H An immunoassay may be utilized to observe the extent of reaction between the receptor and the sample A detection method is also contemplated which enables the diagnosis and identification of a tumor cell in a biological sample from a patient In this method the sample is subjected to at least one of a plurality of tests, each of which is specific for a particular tumor marker The test may be any type of assay, preferably an immunoassay which employs an antibody specific for a tumor marker. The tests may be carried out sequentially until one of them indicates the presence of a particular marker. Further, a kit for screening a patient for colorectal carcinoma is contemplated which contains a plurality of different antibodies specific for tumor markers These antibodies may include those reacting with one of the following markers: huXAG-1 , CEA, NCA; CA 19.9, and alpha- 1 -acid glycoprotein A method for diagnosis of diseases related to altered levels of huXAG-1, huXAG-2 or huXAG-3 gene expression is also provided Also provided are methods for identifying receptors of huXAG-1, huXAG- 2 or huXAG-3 An additional aspect of the invention is related to a method for treating an individual in need of an increased level of huXAG-1, huXAG-2 or huXAG-3 activity in the body comprising administering to such an individual a composition comprising a therapeutically effective amount of an isolated huXAG-1, huXAG-2, or huXAG-3 polypeptide of the invention or an agonist thereof. A still further aspect of the invention is related to a method for treating an individual in need of a decreased level of huXAG-1, huXAG-2, or huXAG-3 activity in the body comprising administering to such an individual a composition comprising a therapeutically effective amount of an huXAG- 1 , huXAG-2, or huXAG-3 antagonist. Preferred antagonists for use in the present invention are huXAG-1-, huXAG-2-, or huXAG-3-specific antibodies. Brief Description of the Figures Figure 1 shows the nucleotide (SEQ LD NO: 1) and deduced amino acid (SEQ ID NO:2) sequences of huXAG-1. The protein has a leader sequence of about 20 amino acid residues (underlined) and a deduced molecular weight of about 20 kDa. The predicted amino acid sequence of the mature huXAG-1 protein is also shown. Figures 2A-B show the nucleotide (SEQ LD NO:3) and deduced amino acid (SEQ ID NO:4) sequences of huXAG-2. The protein has a leader sequence of about 23 amino acid residues (underlined). The predicted amino acid sequence of the mature huXAG-2 protein is also shown. Figures 3A-B show the nucleotide (SEQ ID NO: 5) and deduced amino acid (SEQ LD NO:6) sequences of huXAG-3. The protein has a leader sequence of about 23 amino acid residues (underlined). The predicted amino acid sequence of the mature huXAG-3 protein is also shown. Figures 4A-B show the regions of similarity between the amino acid sequences of the huXAG-1, huXAG-2, and huXAG-3 proteins and t e Xenopus laevis XAG protein (SEQ ID NO:7). The consensus sequence is shown (SEQ LD NO:8). Figure 5 shows an analysis of the huXAG- 1 amino acid sequence. Alpha, beta, turn and coil regions; hydrophilicity and hydrophobicity; amphipathic regions; flexible regions; antigenic index and surface probability are shown. In the "Antigenic Index - Jameson-Wolf graph, amino acid residues about 20 to about 43, about 44 to about 52, about 61 to about 72, about 90 to about 103, about 1 13 to about 125, and about 138 to about 150 in Figure 1 correspond to the shown highly antigenic regions of the huXAG-1 protein. These highly antigenic fragments in Figure 1 correspond to the following fragments, respectively, in SEQ LD NO:2: amino acid residues about -1 to about 23, about 24 to about 32, about 41 to about 52, about 70 to about 83, about 93 to about 105, and about 118 to about 130. Figure 6 shows an analysis of the huXAG-2 amino acid sequence, as described above for Figure 5. In the "Antigenic Index - Jameson-Wolf graph, amino acid residues about 23 to about 38, about 43 to about 53, about 94 to about 112, and about 120 to about 138 in Figure 2 correspond to the shown highly antigenic regions of the huXAG-2 protein. These highly antigenic fragments in Figure 2 correspond to the following fragments, respectively, in SEQ LD NO:4: amino acid residues about -1 to about 15, about 20 to about 30, about 71 to about 89, and about 97 to about 115. Figure 7 shows an analysis of the huXAG-3 amino acid sequence, as described above for Figure 5. In the "Antigenic Index - Jameson- Wolf graph, amino acid residues about 25 to about 44, about 104 to about 155; and about 132 to about 150 in Figure 3 correspond to the shown highly antigenic regions of the huXAG-3 protein. These highly antigenic fragments in Figure 3 correspond to the following fragments, respectively, in SEQ ID NO: 6: amino acid residues about 2 to about 21; about 81 to about 92, and about 109 to about 127 Detailed Description The present inventors have identified a novel family of human growth factors, consisting of three members: huXAG-1, huXAG-2 and huXAG-3. These proteins share homology with the XAG protein of Xenopus laevis, which is involved in embryogenesis and is expressed in adult tissue. Overexpression of growth factors can lead to disease states, such as cancer Underexpression of growth factors can also be detrimental, for example, in damaged tissue The present invention provides isolated nucleic acid molecules comprising a polynucleotide encoding a huXAG-1 polypeptide having the amino acid sequence shown in SEQ LD NO:2, which was determined by sequencing a cloned cDNA. The nucleotide sequence shown in SEQ ID NO 1 was obtained by sequencing a cDNA clone, which was deposited on June 27, 1996 at the American Type Culture Collection, 12301 Park Lawn Drive, Rockville, Maryland 20852, and given accession number 97641 The deposited clone is inserted in the pBluescript SK(-) plasmid (Stratagene, LaJolla, CA) using the BamHl and Asp718I restriction endonuclease cleavage sites The present invention also provides isolated nucleic acid molecules comprising a polynucleotide encoding a huXAG-2 polypeptide having the amino acid sequence shown in SEQ ID NO:4, which was determined by sequencing a cloned cDNA. The nucleotide sequence shown in SEQ ID NO:3 was obtained by sequencing a cDNA clone, which was deposited on June 27, 1997 at the American Type Culture Collection, 12301 Park Lawn Drive, Rockville, Maryland 20852, and given accession number 209134. The deposited clone is inserted in the pBluescript SK(-) plasmid (Stratagene, LaJolla, CA) using the Bell and Asp718I restriction endonuclease cleavage sites. The present invention also provides isolated nucleic acid molecules comprising a polynucleotide encoding a huXAG-3 polypeptide having the amino acid sequence shown in SEQ ID NO.6, which was determined by sequencing a cloned cDNA. The nucleotide sequence shown in SEQ ID NO.5 was obtained by sequencing a cDNA clone, which was deposited on July 3, 1997 at the American Type Culture Collection, 12301 Park Lawn Drive, Rockville, Maryland 20852, and given accession number 209137. The deposited clone is inserted in the pBluescript SK(-) plasmid (Stratagene, LaJolla, CA) using the BamHl and Asp718I restriction endonuclease cleavage sites. The huXAG-1, huXAG-2 and huXAG-3 proteins of the present invention share sequence homology with the XAG protein of Xenopus laevis (Figure 4) (SEQ ID NO:7). Nucleic Acid Molecules Unless otherwise indicated, all nucleotide sequences determined by sequencing a DNA molecule herein were determined using an automated DNA sequencer (such as the Model 373 from Applied Biosystems, Inc ) , and all amino acid sequences of polypeptides encoded by DNA molecules determined herein were predicted by translation of a DNA sequence determined as above. Therefore, as is known in the art for any DNA sequence determined by this automated approach, any nucleotide sequence determined herein may contain some errors. Nucleotide sequences determined by automation are typically at least about 90% identical, more typically at least about 95% to at least about 99.9% identical to the actual nucleotide sequence of the sequenced DNA molecule. The actual sequence can be more precisely determined by other approaches including manual DNA sequencing methods well known in the art As is also known in the art, a single insertion or deletion in a determined nucleotide sequence compared to the actual sequence will cause a frame shift in translation of the nucleotide sequence such that the predicted amino acid sequence encoded by a determined nucleotide sequence will be completely different from the amino acid sequence actually encoded by the sequenced DNA molecule, beginning at the point of such an insertion or deletion Unless otherwise indicated, each "nucleotide sequence" set forth herein is presented as a sequence of deoxyribonucleotides (abbreviated A, G , C and T) However, by "nucleotide sequence" of a nucleic acid molecule or polynucleotide is intended, for a DNA molecule or polynucleotide, a sequence of deoxyribonucleotides, and for an RNA molecule or polynucleotide, the corresponding sequence of ribonucleotides (A G C and U), where each thy idine deoxyribonucleotide (T) in the specified deoxyribonucleotide sequence is replaced by the ribonucleotide uridine (U) For instance, reference to an RNA molecule having the sequence of SEQ ID NO 1 set forth using deoxyribonucleotide abbreviations is intended to indicate an RNA molecule having a sequence in which each deoxyribonucleotide A, G or C of SEQ ID NO 1 has been replaced by the corresponding ribonucleotide A, G or C, and each deoxyribonucleotide T has been replaced by a ribonucleotide U Using the information provided herein, such as the nucleotide sequence in SEQ ID NO 1, SEQ ID NO 3, or SEQ ID NO 5, a nucleic acid molecule of the present invention encoding a huXAG-1, huXAG-2 or huXAG-3 polypeptide may be obtained using standard cloning and screening procedures, such as those for cloning cDNAs using mRNA as starting material Illustrative of the invention, the nucleic acid molecule described in SEQ ID NO 1 was discovered in a cDNA library derived from human colon cancer tissue No corresponding gene sequence was found when a cDNA library that was derived from normal colon tissue was screened. The determined nucleotide sequence of the huXAG- 1 cDNA of SEQ ID NO I contains an open reading frame encoding a protein of 175 amino acid residues, with an initiation codon at positions 71-73 of the nucleotide sequence in SEQ ED NO:l, a predicted leader sequence of about 20 amino acid residues, and a deduced molecular weight of about 20 kDa The amino acid sequence of the predicted mature huXAG-1 is shown in SEQ ID NO 2 from amino acid residue 1 to residue 155 The nucleic acid molecule described in SEQ ID NO 3 was discovered in a cDNA library derived from human microvascular endothelial cells The determined nucleotide sequence of the huXAG-2 cDNA of SEQ LD NO 3 contains an open reading frame encoding a protein of 172 amino acid residues, with an initiation codon at positions 88-90 of the nucleotide sequence in SEQ ID NO 3, and a predicted leader sequence of about 23 amino acid residues The amino acid sequence of the predicted mature huXAG-3 is shown in SEQ ID NO 4 from amino acid residue 1 to residue 149 The nucleic acid molecule described in SEQ ID NO 5 was discovered in a cDNA library derived from human small intestine The determined nucleotide sequence of the huXAG-3 cDNA of SEQ ID NO 5 contains an open reading frame encoding a protein of 166 amino acid residues, with an initiation codon at positions 49-51 of the nucleotide sequence in SEQ ID NO 5, and a predicted leader sequence of about 23 amino acid residues The ammo acid sequence of the predicted mature huXAG-3 is shown in SEQ ID NO 6 from amino acid residue 1 to residue 143 As indicated, the present invention also provides the mature form(s) of the huXAG-1, huXAG-2 and huXAG-3 proteins of the present invention According to the signal hypothesis, proteins secreted by mammalian cells have a signal or secretory leader sequence which is cleaved from the mature protein once export of the growing protein chain across the rough endoplasmic reticulum has been initiated Most mammalian cells and even insect cells cleave secreted proteins with the same specificity However, in some cases, cleavage of a secreted protein is not entirely uniform, which results in two or more mature species on the protein Further, it has long been known that the cleavage specificity of a secreted protein is ultimately determined by the primary structure of the complete protein, that is, it is inherent in the amino acid sequence of the polypeptide Therefore, the present invention provides a nucleotide sequence encoding the mature huXAG- 1 , huXAG-2 and huXAG-3 polypeptides having the amino acid sequence encoded by the corresponding cDNA clone contained in ATCC Deposit No 97641 and shown in SEQ ID NO 2, encoded by the cDNA clone in ATCC Deposit No 209134 and as shown in SEQ LD NO 4, or encoded by the cDNA clone in ATCC Deposit No 209137 and shown in SEQ LD NO 6, respectively By the mature huXAG- 1, huXAG-2 or huXAG-3 proteins having the amino acid sequence encoded by the cDNA clone contained in the host identified as ATCC Deposit No 97641, ATCC Deposit No 209134, or ATCC Deposit No 209137, is meant the mature form(s) of the huXAG-1, huXAG-2 or huXAG-3 protein produced by expression in a mammalian cell (e g , COS cells, as described below) of the complete open reading frame encoded by the human DNA sequence of the clone contained in the vector in the deposited host As indicated below, the mature huXAG-1, huXAG-2 or huXAG-3 having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 97641, ATCC Deposit No 209134, or ATCC Deposit No 209137 may or may not differ from the predicted "mature" huXAG-1, huXAG-2 or huXAG-3 protein shown in SEQ ID NO 2 (amino acids from about I to about 155), SEQ ID NO 4 (amino acids from about 1 to about 149), or SEQ ID NO 6 (amino acids from about 1 to about 143), respectively, depending on the accuracy of the predicted cleavage site based on computer analysis Methods for predicting whether a protein has a secretory leader as well as the cleavage point for that leader sequence are available because it is known that much of the cleavage specificity for a secretory protein resides in certain amino acid residues within the signal sequence and the N-terminus of the mature protein, particularly residues immediately surrounding the cleavage site For instance, the method of McGeoch (Virus Res 3 271-286 (1985)) uses the information from a short N-terminal charged region and a subsequent uncharged region of the complete (uncleaved) protein The method of von Heinje (Nucleic Acids Res 14 4683-4690 (1986)) uses the information from the residues surrounding the cleavage site, typically residues -13 to +2 where +1 indicates the amino acid terminus of the mature protein. The accuracy of predicting the cleavage points of known mammalian secretory proteins for each of these methods is in the range of 75-80%. von Heinje, supra. However, the two methods do not always produce the same predicted cleavage point(s) for a given protein. The leader sequence for the huXAG- 1 protein is predicted to consist of amino acid residues -20 to -1 in SEQ ID NO:2, while the predicted mature huXAG-1 protein consists of residues 1-155; the leader sequence for the huXAG-2 protein is predicted to consist of amino acid residues -23 to -1 in SEQ ID NO:4, while the predicted mature huXAG-2 protein consists of residues 1-149; and the leader sequence for the huXAG-3 protein is predicted to consist of amino acid residues -23 to -1 in SEQ ID NO: 6, while the predicted mature huXAG-3 protein consists of residues 1-143. As one of ordinary skill would appreciate, due to the possibilities of sequencing errors, as well as the variability of cleavage sites for leaders in different known proteins, the predicted huXAG-1 polypeptide encoded by the deposited cDNA comprises about 175 amino acids, but may be anywhere in the range of 165-185 amino acids; and the predicted leader sequence of huXAG-1 is about 20 amino acids, but may be anywhere in the range of about 15 to about 25 amino acids. The predicted huXAG-2 polypeptide encoded by the deposited cDNA comprises about 172 amino acids, but may be anywhere in the range of 167-177 amino acids; and the predicted leader sequence of huXAG-2 is about 23 amino acids, but may be anywhere in the range of about 18 to about 28 amino acids. The predicted huXAG-3 polypeptide encoded by the deposited cDNA comprises about 166 amino acids, but may be anywhere in the range of 161-171 amino acids; and the predicted leader sequence of huXAG-3 is about 23 amino acids, but may be anywhere in the range of about 18 to about 28 amino acids. As indicated, nucleic acid molecules of the present invention may be in the form of RNA, such as mRNA, or in the form of DNA, including, for instance, cDNA and genomic DNA obtained by cloning or produced synthetically. The DNA may be double-stranded or single-stranded. Single-stranded DNA or RNA may be the coding strand, also known as the sense strand, or it may be the non-coding strand, also referred to as the anti-sense strand By "isolated" nucleic acid molecule(s) is intended a nucleic acid molecule, DNA or RNA, which has been removed from its native environment For example, recombinant DNA molecules contained in a vector are considered isolated for the purposes of the present invention. Further examples of isolated DNA molecules include recombinant DNA molecules maintained in heterologous host cells or purified (partially or substantially) DNA molecules in solution Isolated RNA molecules include in vivo or in vitro RNA transcripts of the DNA molecules of the present invention Isolated nucleic acid molecules according to the present invention further include such molecules produced synthetically Isolated nucleic acid molecules of the present invention include DNA molecules comprising an open reading frame (ORF) with an initiation codon at positions 71-73 of the nucleotide sequence shown in SEQ ID NO 1 ; DNA molecules comprising the coding sequence for the mature huXAG-1 protein shown in Figure 1 (last 155 amino acids) (SEQ ID NO 2), DNA molecules comprising an open reading frame (ORF) with an initiation codon at positions 88-90 of the nucleotide sequence shown in SEQ ID NO 3, DNA molecules comprising the coding sequence for the mature huXAG-2 protein shown in Figure 2 (last 149 amino acids) (SEQ ID NO:4), DNA molecules comprising an open reading frame (ORF) with an initiation codon at positions 49-51 of the nucleotide sequence shown in SEQ ID NO:5; DNA molecules comprising the coding sequence for the mature huXAG-3 protein shown in Figure 3 (last 143 amino acids) (SEQ ID NO:6); and DNA molecules which comprise a sequence substantially different from those described above but which, due to the degeneracy of the genetic code, still encode the huXAG- 1 , huXAG-2 or huXAG-3 protein. Of course, the genetic code is well known in the art Thus, it would be routine for one skilled in the art to generate the degenerate variants described above. In another aspect, the invention provides isolated nucleic acid molecules encoding the huXAG- 1 polypeptide having an amino acid sequence encoded by the cDNA clone contained in the plasmid deposited as ATCC Deposit No 97641 on June 27, 1996, isolated nucleic acid molecules encoding the huXAG-2 polypeptide having an amino acid sequence encoded by the cDNA clone contained in the plasmid deposited as ATCC Deposit No 2091 4 on June 27, 1997, and isolated nucleic acid molecules encoding the huXAG-3 polypeptide having an amino acid sequence encoded by the cDNA clone contained in the plasmid deposited as ATCC Deposit No. 209137 on July 3, 1997 In a further embodiment, nucleic acid molecules are provided encoding the mature huXAG-1 , huXAG-2 or huXAG-3 polypeptide or the full-length huXAG-1, huXAG-2 or huXAG-3 polypeptide lacking the N-terminai methionine The invention further provides an isolated nucleic acid molecule having the nucleotide sequence shown in SEQ LD NO 1, SEQ ID NO 3 or SEQ ID NO 5 or the nucleotide sequence of the huXAG-1 , huXAG-2 or huXAG-3 cDNA contained in the above-described deposited clones, or a nucleic acid molecule having a sequence complementary to one of the above sequences Such isolated molecules, particularly DNA molecules, are useful as probes for gene mapping, by in situ hybridization with chromosomes, and for detecting expression of the huXAG-1, huXAG-2 or huXAG-3 genes in human tissue, for instance, by Northern blot analysis The present invention is fiirther directed to fragments of the isolated nucleic acid molecules described herein By a fragment of an isolated nucleic acid molecule having the nucleotide sequence of the deposited cDNAs or the nucleotide sequence shown in SEQ ID NO I , SEQ ID NO 3 or SEQ ID NO 5 is intended fragments at least about 15 nt, and more preferably at least about 20 nt, still more preferably at least about 30 nt, and even more preferably, at least about 40 nt in length which are useful as diagnostic probes and primers as discussed herein Of course, larger fragments 50, 100, 150, 200, 250, 300, 350, 400, or 450 nt in length are also useful according to the present invention as are fragments corresponding to most, if not all, of the nucleotide sequence of the deposited cDN s or as shown in SEQ ID NO 1, SEQ LD NO 3 or SEQ ID NO 5 By a fragment at least 20 nt in length, for example, is intended fragments which include 20 or more contiguous bases from the nucleotide sequence of the deposited cDNA or the nucleotide sequence as shown in SEQ ID NO 1 , SEQ ID NO 3 or SEQ ID NO 5 Since the genes have been deposited and the nucleotide sequences shown in SEQ ED NO.1, SEQ LD NO 3 and SEQ LD NO 5 are provided, generating such DNA fragments would be routine to the skilled artisan For example, restriction endonuclease cleavage or shearing by sonication could easily be used to generate fragments of various sizes Alternatively, such fragments could be generated synthetically Preferred nucleic acid fragments of the present invention include nucleic acid molecules encoding epitope-bearing portions of the huXAG-1, huXAG-2 and huXAG-3 proteins In particular, such nucleic acid fragments of the present invention include nucleic acid molecules encoding a polypeptide comprising amino acid residues from about -1 to about 23 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 24 to about 32 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 41 to about 52 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 70 to about 83 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 93 to about 105 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 118 to about 130 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about -1 to about 15 in SEQ ID NO 4, a polypeptide comprising amino acid residues from about 20 to about 30 in SEQ ID NO 4, a polypeptide comprising amino acid residues from about 71 to about 89 in SEQ ID NO 4, a polypeptide comprising amino acid residues from about 97 to about 1 15 in SEQ ED NO 4, a polypeptide comprising amino acid residues from about 2 to about 21 in SEQ ED NO.6, a polypeptide comprising amino acid residues from about 81 to about 92 in SEQ ID NO.6, and a polypeptide comprising amino acid residues from about 109 to about 127 in SEQ ID NO 6 The inventors have determined that the above polypeptide fragments are antigenic regions of the huXAG-1, huXAG-2 and huXAG-3 proteins Methods for determining other such epitope-bearing portions of the huXAG-1, huXAG-2 and huXAG-3 proteins are described in detail below In addition, the present inventors have identified the following cDNA clones related to portions of SEQ ID NO 1 HE2DM19R (SEQ ID NO 9), HPFDA02R (SEQ ID NO 10), HBGDAIOR (SEQ ID NO 1 1), HBGDA22R (SEQ LD NO 12), HBGDA34R (SEQ ED NO 13), HBGDA58R (SEQ ID NO 14), and HBGDA46R (SEQ ID NO 15) The following public ESTs, which relate to portions of SEQ ID NO 1 , have also been identified GenBank Accession No AA244356 ( SEQ ID NO 35), GenBank Accession No T86663 (SEQ ID NO 36), GenBank Accession No AA055880 (SEQ ID NO 37), GenBank Accession No T24475 (SEQ ID NO 38), and GenBank Accession No T24892 (SEQ ID NO 39) The present inventors have also identified the following cDNA clones related to portions of SEQ ID NO 3 HJPAJ39R (SEQ ID NO 16), HPASGl IR (SEQ LD NO 17), HOSBP40R (SEQ ED NO 18), HTE AK67R (SEQ ID NO 19), HLQBB65R (SEQ ID NO 20), HLQBB77R (SEQ ID NO 21), and HJPAC37R (SEQ LD NO 22) A number of public ESTs related to portions of SEQ ID NO 3 are listed in GenBank The following public ESTs, related to portions of SEQ ID NO 5, have been identified GenBank Accession No T94990 (SEQ ID NO 40), and GenBank Accession No T94936 (SEQ ID NO 41 ) In another aspect, the invention provides an isolated nucleic acid molecule comprising a polynucleotide which hybridizes under stringent hybridization conditions to a portion of the polynucleotide in a nucleic acid molecule of the invention described above, for instance, the cDNA clone contained in ATCC Deposit No 97641 or ATCC Deposit No 209134 or ATCC Deposit No 209137 By "stringent hybridization conditions" is intended overnight incubation at 42 °C in a solution comprising 50% formamide, 5x SSC (150 mM NaCl, 15mM trisodium citrate), 50 mM sodium phosphate (pH 7 6), 5x Denhardt's solution, 10% dextran sulfate, and 20 g/ml denatured, sheared salmon sperm DNA, followed by washing the filters in 0 lx SSC at about 65 °C By a polynucleotide which hybridizes to a "portion" of a polynucleotide is intended a polynucleotide (either DNA or RNA) hybridizing to at least about 15 nucleotides (nt), and more preferably at least about 20 nt, still more preferably at least about 30 nt, and even more preferably about 30-70 nt of the reference polynucleotide These are useful as diagnostic probes and primers as discussed above and in more detail below Of course, polynucleotides hybridizing to a larger portion of the reference polynucleotide (e g , the deposited cDNA clones), for instance, a portion 50, 100, 150, 200, 250, 300, 350, 400, or 450 nt in length, or even to the entire length of the reference polynucleotide, are also useful as probes according to the present invention, as are polynucleotides corresponding to most, if not all, of the nucleotide sequence of the deposited cDNAs or the nucleotide sequence as shown in SEQ ID NO 1, SEQ ID NO 3 or SEQ ID NO 5 By a portion of a polynucleotide of "at least 20 nt in length," for example, is intended 20 or more contiguous nucleotides from the nucleotide sequence of the reference polynucleotide (e g , the deposited cDNAs or the nucleotide sequence as shown in SEQ ID NO 1, SEQ ID NO 3 or SEQ ID NO 5) As indicated, such portions are useful diagnostically either as a probe according to conventional DNA hybridization techniques or as primers for amplification of a target sequence by the polymerase chain reaction (PCR), as described, for instance, in Molecular Cloning, A Laboratory Manual, 2nd. edition, Sambrook, J , Fritsch, E F. and Maniatis, T., eds , Cold Spring Harbor Laboratory Press , Cold Spring Harbor, N Y (1989), the entire disclosure of which is hereby incorporated herein by reference Since huXAG-1, huXAG-2 and huXAG-3 cDNA clones have been deposited and their determined nucleotide sequences are provided in SEQ ID NO 1, SEQ LD NO 3 and SEQ ED NO 5, respectively, generating polynucleotides which hybridize to a portion of the huXAG-1, huXAG-2 or huXAG-3 cDNA molecules would be routine to the skilled artisan For example, restriction endonuclease cleavage or shearing by sonication of the huXAG-1, huXAG-2 or huXAG-3 cDNA clones could easily be used to generate DNA portions of various sizes which are polynucleotides that hybridize to a portion of the huXAG- 1 , huXAG-2 or huXAG-3 cDNA molecules. Alternatively, the hybridizing polynucleotides of the present invention could be generated synthetically according to known techniques Of course, a polynucleotide which hybridizes only to a poly A sequence (such as the 3 ' terminal poly(A) tract of the huXAG-1 , huXAG-2 or huXAG-3 cDNAs shown in SEQ ID NO 1 , SEQ ID NO.3 and SEQ ED NO.5, respectively), or to a complementary stretch of T (or U) resides, would not be included in a polynucleotide of the invention used to hybridize to a portion of a nucleic acid of the invention, since such a polynucleotide would hybridize to any nucleic acid molecule containing a poly (A) stretch or the complement thereof (e g., practically any double-stranded cDNA clone) As indicated, nucleic acid molecules of the present invention which encode a huXAG-1, huXAG-2 or huXAG-3 polypeptide may include, but are not limited to those encoding the amino acid sequence of the mature polypeptide, by itself; the coding sequence for the mature polypeptide and additional sequences, such as those encoding the about 20 amino acid leader or secretory sequence of huXAG- 1 , or the about 23 amino acid leader or secretory sequence of huXAG-2, or the about 23 amino acid leader or secretory sequence of huXAG-3, such as a pre-, or pro- or prepro- protein sequence, the coding sequence of the mature polypeptides, with or without the aforementioned additional coding sequences, together with additional, non-coding sequences, including for example, but not limited to introns and non-coding 5 ' and ' sequences, such as the transcribed, non-translated sequences that play a role in transcription, mRNA processing, including splicing and polyadenylation signals, for example - ribosome binding and stability of mRNA, an additional coding sequence which codes for additional amino acids, such as those which provide additional functionalities Thus, the sequence encoding the polypeptide may be fused to a marker sequence, such as a sequence encoding a peptide which facilitates purification of the fused polypeptide In certain preferred embodiments of this aspect of the invention, the marker amino acid sequence is a hexa-histidine peptide, such as the tag provided in a pQE vector (Qiagen, Inc ), among others, many of which are commercially available As described in Gentz et al, Proc. Natl. Acad. Sci. USA 86 821-824 ( 1989), for instance, hexa-histidine provides for convenient purification of the fusion protein The "HA" tag is another peptide useful for purification which corresponds to an epitope deπved from the influenza hemagglutinin protein, which has been described by Wilson et al.. Cell 37 161 (1984) As discussed below, other such fusion proteins include the huXAG- 1, huXAG-2 or huXAG-3 fused to Fc at the N- or C-terminus The present invention further relates to variants of the nucleic acid molecules of the present invention, which encode portions, analogs or derivatives ofthe huXAG-1, huXAG-2 or huXAG-3 proteins Variants may occur naturally, such as a natural allelic variant By an "alle c variant" is intended one of several alternate forms of a gene occupying a given locus on a chromosome of an organism Genes II, Lewin, B , ed , John Wiley & Sons, New York (1985) Non-naturally occurring variants may be produced using art-known mutagenesis techniques Such variants include those produced by nucleotide substitutions, deletions or additions The substitutions, deletions or additions may involve one or more nucleotides The variants may be altered in coding regions, non-coding regions, or both Alterations in the coding regions may produce conservative or non-conservative amino acid substitutions, deletions or additions Especially preferred among these are silent substitutions, additions and deletions, which do not alter the properties and activities of the huXAG- 1, huXAG-2 or huXAG-3 proteins or portions thereof Also especially preferred in this regard are conservative substitutions Most highly preferred are nucleic acid molecules encoding the mature proteins having the amino acid sequence shown in SEQ LD NO 2, SEQ ID NO.4 or SEQ ID NO 6, or the mature huXAG-1, huXAG-2 or huXAG-3 amino acid sequences encoded by the deposited cDNA clones Further embodiments of the invention include isolated nucleic acid molecules comprising a polynucleotide having a nucleotide sequence at least 95% identical, and more preferably at least 96%, 97%, 98% or 99% identical to (a) a nucleotide sequence encoding the polypeptide having the amino acid sequence in SEQ ID NO 2, SEQ ID NO 4 or SEQ ID NO 6, (b) a nucleotide sequence encoding the polypeptide having the ammo acid sequence in SEQ ID NO 2, SEQ ID NO 4 or SEQ LD NO 6 but lacking the N-terminal methionine, (c) a nucleotide sequence encoding the polypeptide having the amino acid sequence at positions from about 1 to about 155 in SEQ ID NO 2, or from about 1 to about 149 in SEQ ID NO 4, or from about 1 to about 143 in SEQ ID NO 6 , (d) a nucleotide sequence encoding the polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 97641 , or in ATCC Deposit No 209134, or in ATCC Deposit No 209137, (e) a nucleotide sequence encoding the mature huXAG-1, huXAG-2 or huXAG-3 polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 97641, ATCC Deposit No 209134 or ATCC Deposit No 209137, respectively, or (f) a nucleotide sequence complementary to any of the nucleotide sequences in (a), (b), (c), (d), or (e) By a polynucleotide having a nucleotide sequence at least, for example, 95% "identical" to a reference nucleotide sequence encoding a huXAG-1, huXAG-2 or huXAG-3 polypeptide is intended that the nucleotide sequence of the polynucleotide is identical to the reference sequence except that the polynucleotide sequence may include up to five point mutations per each 100 nucleotides of the reference nucleotide sequence encoding the huXAG-1, huXAG-2 or huXAG-3 polypeptide In other words, to obtain a polynucleotide having a nucleotide sequence at least 95% identical to a reference nucleotide sequence, up to 5% of the nucleotides in the reference sequence may be deleted or substituted with another nucleotide, or a number of nucleotides up to 5% of the total nucleotides in the reference sequence may be inserted into the reference sequence These mutations of the reference sequence may occur at the 5' or 3 ' terminal positions of the reference nucleotide sequence or anywhere between those terminal positions, interspersed either individually among nucleotides in the reference sequence or in one or more contiguous groups within the reference sequence As a practical matter, whether any particular nucleic acid molecule is at least 95%, 96%, 97%, 98% or 99% identical to, for instance, the nucleotide sequence shown in SEQ ID NO 1, SEQ ID NO 3 or SEQ LD NO 5 or to the nucleotides sequence of the deposited cDNA clones can be determined conventionally using known computer programs such as the Bestfit program (Wisconsin Sequence Analysis Package, Version 8 for Unix, Genetics Computer Group, University Research Park, 575 Science Drive, Madison, WI 5371 1) Bestfit uses the local homology algorithm of Smith and Waterman, Advances in Applied Mathematics 2.482-489 (1981), to find the best segment of homology between two sequences When using Bestfit or any other sequence alignment program to determine whether a particular sequence is, for instance, 95% identical to a reference sequence according to the present invention, the parameters are set, of course, such that the percentage of identity is calculated over the full length of the reference nucleotide sequence and that gaps in homology of up to 5% of the total number of nucleotides in the reference sequence are allowed The present application is directed to nucleic acid molecules at least 95%, 96%, 97%, 98% or 99% identical to the nucleic acid sequence shown in SEQ ID NO 1, SEQ ID NO:3 or SEQ ID NO:5 or to the nucleic acid sequence of the deposited cDNAs, irrespective of whether they encode a polypeptide having huXAG-1, huXAG-2 or huXAG-3 activity This is because even where a particular nucleic acid molecule does not encode a polypeptide having huXAG-1, huXAG-2 or huXAG-3 activity, one of skill in the art would still know how to use the nucleic acid molecule, for instance, as a hybridization probe or a polymerase chain reaction (PCR) primer. Uses of the nucleic acid molecules of the present invention that do not encode a polypeptide having huXAG-1, huXAG-2 or huXAG-3 activity include, inter a a, (1) isolating the huXAG-1, huXAG-2 or huXAG-3 gene or allelic variants thereof in a cDNA library, (2) in situ hybridization (e.g , "FISH") to metaphase chromosomal spreads to provide precise chromosomal location of the huXAG-1, huXAG-2 or huXAG-3 gene, as described in Verma etal, Human Chromosomes. A Manual of Basic Techniques, Pergamon Press, New York (1 88), and (3) Northern Blot analysis for detecting huXAG-1, huXAG-2 or huXAG-3 mRNA expression in specific tissues Preferred, however, are nucleic acid molecules having sequences at least 95%, 96%, 97%, 98% or 99% identical to the nucleic acid sequence shown in SEQ ID NO 1, SEQ ID NO 3 or SEQ ID NO 5 or to the nucleic acid sequence of the deposited cDNAs which do, in fact, encode a polypeptide having huXAG-1, huXAG-2 or huXAG-3 protein activity By "a polypeptide having huXAG-1, huXAG-2 or huXAG-3 activity" is intended polypeptides exhibiting activity similar, but not necessarily identical, to an activity of the huXAG-1, huXAG-2 or huXAG-3 protein of the invention (either the full-length protein or, preferably, the mature protein), as measured in a particular biological assay To measure huXAG-1, huXAG-2 or huXAG-3 activity, a cell proliferation assay can be used For huXAG-1, cancerous colon cells can be used For huXAG-2, microvascular endothelial cells can be used, as well as other cells which are responsive to huXAG-2 For huXAG-3, colon cells can be used, as well as other cells that are responsive to huXAG-3 There are several protocols to perform cell proliferation assays that are well known in the art Typically, the incorporation of a nucleoside analog into newly synthesized DNA is employed to measure proliferation (active cell growth) in a population of cells For example, bromodeoxyuridine (BrdU) can be employed as a DNA labeling reagent and Anti- BrdU mouse monoclonal antibody (clone BMC 9318 IgG,) can be employed as a detection reagent This antibody binds only to cells containing DNA which has incorporated bromodeoxyuridine A number of detection methods can be used in conjunction with this assay including immunofluorescence, immunohistochemical, ELISA and colorimetric methods. Kits that include bromodeoxyuridine (BrdU) and Anti-BrdU mouse monoclonal antibody are commercially available from Boehringer Mannheim (Indianapolis, IN). Thus, "a polypeptide having huXAG-1, huXAG-2 or huXAG-3 protein activity" includes polypeptides that exhibit huXAG-1, huXAG-2 or huXAG-3 activity, in an appropriate above-described assay. Although the degree of activity need not be identical to that of the huXAG-1, huXAG-2 or huXAG-3 protein, preferably, "a polypeptide having huXAG-1, huXAG-2 or huXAG-3 protein activity" will exhibit substantially similar activity as compared to the huXAG-1, huXAG-2 or huXAG-3 protein (i.e., the candidate polypeptide will exhibit greater activity or not more than about twenty-fold less and, preferably, not more than about ten-fold less activity relative to the reference huXAG-1, huXAG-2 or huXAG-3 protein). Of course, due to the degeneracy of the genetic code, one of ordinary skill in the art will immediately recognize that a large number of the nucleic acid molecules having a sequence at least 95%, 96%, 97%, 98%, or 99% identical to the nucleic acid sequence of the deposited cDNAs or the nucleic acid sequence shown in SEQ ID NO: l, SEQ ED NO 3 or SEQ ID NO 5 will encode a polypeptide "having huXAG-1, huXAG-2 or huXAG-3 protein activity." In fact, since degenerate variants of these nucleotide sequences all encode the same polypeptide, this will be clear to the skilled artisan even without performing the above described comparison assays. It will be further recognized in the art that, for such nucleic acid molecules that are not degenerate variants, a reasonable number will also encode a polypeptide having huXAG- 1 , huXAG-2 or huXAG-3 protein activity. This is because the skilled artisan is fully aware of amino acid substitutions that are either less likely or not likely to significantly effect protein function (e.g., replacing one aliphatic amino acid with a second aliphatic amino acid). For example, guidance concerning how to make phenotypically silent amino acid substitutions is provided in Bowie, J. U. et al., "Deciphering the Message in Protein Sequences Tolerance to Amino Acid Substitutions," Science 247: 1306-1310 (1990), wherein the authors indicate that there are two main approaches for studying the tolerance of an amino acid sequence to change The first method relies on the process of evolution, in which mutations are either accepted or rejected by natural selection The second approach uses genetic engineering to introduce amino acid changes at specific positions of a cloned gene and selections or screens to identify sequences that maintain functionality As the authors state, these studies have revealed that proteins are surprisingly tolerant of amino acid substitutions The authors further indicate which amino acid changes are likely to be permissive at a certain position of the protein For example, most buπed amino acid residues require nonpolar side chains, whereas few features of surface side chains are generally conserved Other such phenotypically silent substitutions are described in Bowie, J U et al , supra, and the references cited therein Vectors and Host Cells The present invention also relates to vectors which include the isolated DNA molecules of the present invention, host cells which are genetically engineered with the recombinant vectors, and the production of huXAG-1, huXAG-2 or huXAG-3 polypeptides or fragments thereof by recombinant techniques Recombinant constructs may be introduced into host cells using well known techniques such as infection, transduction, transfection, transvection, electroporation and transformation The vector may be, for example, a phage, plasmid, viral or retroviral vector Retroviral vectors may be replication competent or replication defective In the latter case, viral propagation generally will occur only in complementing host cells The polynucleotides may be joined to a vector containing a selectable marker for propagation in a host Generally, a plasmid vector is introduced in a precipitate, such as a calcium phosphate precipitate, or in a complex with a charged lipid If the vector is a virus, it may be packaged m vitro using an appropriate packaging cell line and then transduced into host cells Preferred are vectors comprising cis-acting control regions to the polynucleotide of interest Appropriate trans-acting factors may be supplied by the host, supplied by a complementing vector or supplied by the vector itself upon introduction into the host In certain preferred embodiments in this regard, the vectors provide for specific expression, which may be inducible and/or cell type-specific Particularly preferred among such vectors are those inducible by environmental factors that are easy to manipulate, such as temperature and nutrient additives Expression vectors useful in the present invention include chromosomal-, episomal- and virus-derived vectors, e.g., vectors derived from bacterial plasmids, bacteriophage, yeast episomes, yeast chromosomal elements, viruses such as baculoviruses, papova viruses, vaccinia viruses, adenoviruses, fowl pox viruses, pseudorabies viruses and retroviruses, and vectors derived from combinations thereof, such as cosmids and phagemids The DNA insert should be operatively linked to an appropriate promoter, such as the phage lambda PL promoter, the E. coli lac, trp and tac promoters, the SV40 early and late promoters and promoters of retroviral LTRs, to name a few Other suitable promoters will be known to the skilled artisan The expression constructs will further contain sites for transcription initiation, termination and, in the transcribed region, a ribosome binding site for translation The coding portion of the mature transcripts expressed by the constructs will preferably include a translation initiating at the beginning and a termination codon (UAA, UGA or UAG) appropriately positioned at the end of the polypeptide to be translated As indicated, the expression vectors will preferably include at least one selectable marker Such markers include dihydrofolate reductase or neomycin resistance for eukaryotic cell culture and tetracycline or ampicillin resistance genes for culturing in E. coli and other bacteria. Representative examples of appropriate hosts include, but are not limited to, bacterial cells, such as E. coli, Streptomyces and Salmonella typhimurium cells; fungal cells, such as yeast cells; insect cells such as Drosophila S2 and Spodoptera Sf9 cells; animal cells such as CHO, COS and Bowes melanoma cells; and plant cells. Appropriate culture mediums and conditions for the above-described host cells are known in the art. Among vectors preferred for use in bacteria include pQE70, pQE60 and pQE-9, available from Qiagen; pBS vectors, Phagescript vectors, Bluescript vectors, pNH8A, pNHlόa, pNH18A, pNH46A, available from Stratagene; and ptrc99a, pKK223-3, pKK233-3, pDR540, pRIT5 available from Pharmacia. Among preferred eukaryotic vectors are pWLNEO, pSV2CAT, pOG44, pXTl and pSG available from Stratagene; and pSVK3, pBPV, pMSG and pSVL available from Pharmacia. Other suitable vectors will be readily apparent to the skilled artisan. Among known bacterial promoters suitable for use in the present invention include the E. coli lac\ and lacL promoters, the T3 and T7 promoters, the gpt promoter, the lambda PR and PL promoters and the trp promoter Suitable eukaryotic promoters include the CMV immediate early promoter, the HSV thymidine kinase promoter, the early and late SV40 promoters, the promoters of retroviral LTRs, such as those of the Rous sarcoma virus (RSV), and metallothionein promoters, such as the mouse metallothionein-1 promoter Introduction of the construct into the host cell can be effected by calcium phosphate transfection, DEAE-dextran mediated transfection, cationic lipid- ediated transfection, electroporation, transduction, infection or other methods. Such methods are described in many standard laboratory manuals, such as Davis el al. , Basic Methods In Molecular Biology ( 1986) Transcription of the DNA encoding the polypeptides of the present invention by higher eukaryotes may be increased by inserting an enhancer sequence into the vector. Enhancers are cis-acting elements of DNA, usually about from 10 to 300 bp that act to increase transcriptional activity of a promoter in a given host cell-type. Examples of enhancers include the SV40 enhancer, which is located on the late side of the replication origin at bp 100 to 270, the cytomegalovirus early promoter enhancer, the polyoma enhancer on the late side of the replication origin, and adenovirus enhancers. For secretion of the translated protein into the lumen of the endoplasmic reticulum, into the periplasmic space or into the extracellular environment, appropriate secretion signals may be incorporated into the expressed polypeptide. The signals may be endogenous to the polypeptide or they may be heterologous signals. The polypeptide may be expressed in a modified form, such as a fusion protein, and may include not only secretion signals, but also additional heterologous functional regions. For instance, a region of additional amino acids, particularly charged amino acids, may be added to the N-terminus of the polypeptide to improve stability and persistence in the host cell, during purification, or during subsequent handling and storage Also, peptide moieties may be added to the polypeptide to facilitate purification. Such regions may be removed prior to final preparation of the polypeptide The addition of peptide moieties to polypeptides to engender secretion or excretion, to improve stability and to facilitate purification, among others, are familiar and routine techniques in the art A preferred fusion protein comprises a heterologous region from immunoglobulin that is useful to solubilize proteins For example, EP-A-O 464 533 (Canadian counterpart 2045869) discloses fusion proteins comprising various portions of constant region of immunoglobin molecules together with another human protein or part thereof. In many cases, the Fc part in a fusion protein is thoroughly advantageous for use in therapy and diagnosis and thus results, for example, in improved pharmacokinetic properties (EP-A 0232 262). On the other hand, for some uses it would be desirable to be able to delete the Fc part after the fusion protein has been expressed, detected and purified in the advantageous manner described. This is the case when Fc portion proves to be a hindrance to use in therapy and diagnosis, for example when the fusion protein is to be used as antigen for immunizations. In drug discovery, for example, human proteins, such as, hLL5- has been fused with Fc portions for the purpose of high-throughput screening assays to identify antagonists of hIL-5. See, D. Bennett et al. , Journal of Molecular Recognition, Vol. 8:52-58 (1995) and K. Johanson et al., The Journal of Biological Chemistry, Vol. 270, No. 16:9459-9471 (1995). The huXAG-1, huXAG-2 or huXAG-3 protein can be recovered and purified from recombinant cell cultures by well-known methods including ammonium sulfate or ethanol precipitation, acid extraction, anion or cation exchange chromatography, phosphoceliulose chromatography, hydrophobic interaction chromatography, affinity chromatography, hydroxylapatite chromatography and lectin chromatography. Most preferably, high performance liquid chromatography ("HPLC") is employed for purification. Polypeptides of the present invention include naturally purified products, products of chemical synthetic procedures, and products produced by recombinant techniques from a prokaryotic or eukaryotic host, including, for example, bacterial, yeast, higher plant, insect and mammalian cells. Depending upon the host employed in a recombinant production procedure, the polypeptides of the present invention may be glycosylated or may be non-glycosylated In addition, polypeptides of the invention may also include an initial modified methionine residue, in some cases as a result of host-mediated processes. huXA G-l, huXA G-2 and huXA G-3 Polypeptides and Fragments The invention further provides an isolated huXAG- 1 polypeptide having the amino acid sequence encoded by the cDNA in ATCC Deposit No. 97641 , or the amino acid sequence in SEQ ED NO:2, or a peptide or polypeptide comprising a portion of the above polypeptides. The invention also provides an isolated huXAG-2 polypeptide having the amino acid sequence encoded by the cDNA in ATCC Deposit No. 209134, or the amino acid sequence in SEQ ID NO:4, or a peptide or polypeptide comprising a portion thereof. The invention further provides an isolated huXAG-3 polypeptide having the amino acid sequence encoded by the cDNA in ATCC Deposit No 209137, or the amino acid sequence in SEQ ID NO 6, or a peptide or polypeptide comprising a portion thereof The terms "peptide" and "oligopeptide" are considered synonymous (as is commonly recognized) and each term can be used interchangeably as the context requires to indicate a chain of at least to amino acids coupled by peptidyl linkages The word "polypeptide" is used herein for chains containing more than ten amino acid residues. All oligopeptide and polypeptide formulas or sequences herein are written from left to right and in the direction from amino terminus to carboxy terminus It will be recognized in the art that some amino acid sequences of the huXAG-1, huXAG-2 and huXAG-3 polypeptides can be varied without significant effect of the structure or function of the protein If such differences in sequence are contemplated, it should be remembered that there will be critical areas on the protein which determine activity In general, it is possible to replace residues which form the tertiary structure, provided that residues performing a similar function are used In other instances, the type of residue may be completely unimportant if the alteration occurs at a non-critical region of the protein Thus, the invention further includes variations of huXAG-1, huXAG-2 and huXAG-3 polypeptides which show substantial huXAG-1 , huXAG-2 or huXAG-3 polypeptide activity or which include regions of huXAG-1, huXAG-2 or huXAG-3 protein such as the protein portions discussed below Such mutants include deletions, insertions, inversions, repeats, and type substitutions (for example, substituting one hydrophilic residue for another, but not strongly hydrophilic for strongly hydrophobic as a rule) Small changes or such "neutral" amino acid substitutions will generally have little effect on activity Typically seen as conservative substitutions are the replacements, one for another, among the aliphatic amino acids Ala, Val, Leu and He, interchange of the hydroxyl residues Ser and Thr, exchange of the acidic residues Asp and Glu, substitution between the amide residues Asn and Gin, exchange of the basic residues Lys and Arg and replacements among the aromatic residues Phe, Tyr As indicated in detail above, further guidance concerning which amino acid changes are likely to be phenotypically silent (i.e , are not likely to have a significant deleterious effect on a function) can be found in Bowie, J U , et al., "Deciphering the Message in Protein Sequences Tolerance to Amino Acid Substitutions, " Science 247: 1306- 1310 ( 1990). Thus, the fragment, derivative or analog of a polypeptide of SEQ ID NO:2, SEQ ED NO 4, or SEQ ED NO:6 or that encoded by the deposited cDNAs, may be (i) one in which one or more of the amino acid residues are substituted with a conserved or non-conserved amino acid residue (preferably a conserved amino acid residue) and such substituted amino acid residue may or may not be one encoded by the genetic code, or (ii) one in which one or more of the amino acid residues includes a substituent group, or (iii) one in which the mature polypeptide is fused with another compound, such as a compound to increase the half-life of the polypeptide (for example, polyethylene glycol), or (iv) one in which the additional amino acids are fiised to the mature polypeptide, such as an IgG Fc fusion region peptide or leader or secretory sequence or a sequence which is employed for purification of the mature polypeptide or a proprotein sequence Such fragments, derivatives and analogs are deemed to be within the scope of those skilled in the art from the teachings herein Of particular interest are substitutions of charged amino acids with another charged amino acid and with neutral or negatively charged amino acids. The latter results in proteins with reduced positive charge to improve the characteristics of a huXAG-1, huXAG-2 or huXAG-3 protein The prevention of aggregation is highly desirable. Aggregation of proteins not only results in a loss of activity but can also be problematic when preparing pharmaceutical formulations, because they can be immunogenic (Pinckard et al., Clin Exp. Immunol. 2:331-340 (1967), Robbins et al, Diabetes 36:838-845 (1987), Cleland et al. Crit. Rev. Therapeutic Drug Carrier Systems 70:307-377 (1993)) The replacement of amino acids can also change the selectivity of binding to cell surface receptors. Ostade et al., Nature 361.266-26% (1993) describes certain mutations resulting in selective binding of TNF-α to only one of the two known types of TNF receptors. Thus, the huXAG-1, huXAG-2 and huXAG-3 of the present invention may include one or more amino acid substitutions, deletions or additions, either from natural mutations or human manipulation. As indicated, changes are preferably of a minor nature, such as conservative amino acid substitutions that do not significantly affect the folding or activity of the protein (see Table 1) TABLE 1 Conservative Amino Acid Substitutions Of course, the number of amino acid substitutions a skilled artisan would make depends on many factors, including those described above Generally speaking, the number of substitutions for any given hu-XAG-1, huXAG-2, or huXAG-3 polypeptide will not be more than 50, 40, 30, 20, 10, 5, or 3. Amino acids in the huXAG-1, huXAG-2 and huXAG-3 proteins of the present invention that are essential for function can be identified by methods known in the art, such as site-directed mutagenesis or alanine-scanning mutagenesis (Cunningham and Wells, Science 244 1081-1085 ( 1989)) The latter procedure introduces single alanine mutations at every residue in the molecule The resulting mutant molecules are then tested for biological activity such as receptor binding or in vitro, or in vitro proliferative activity Sites that are critical for ligand-receptor binding can also be determined by structural analysis such as crystallization, nuclear magnetic resonance or photoaffinity labeling (Smith et al, J. Mol. Biol. 224 899-904 (1992) and de Vos e/ /. Science 255 306-312 (1992)) The polypeptides of the present invention are preferably provided in an isolated form By "isolated polypeptide" is intended a polypeptide removed from its native environment Thus, a polypeptide produced and/or contained within a recombinant host cell is considered isolated for purposes of the present invention Also intended as an "isolated polypeptide" are polypeptides that have been purified, partially or substantially, from a recombinant host cell or a native source For example, a recombinantly produced version of the huXAG-1 , huXAG-2 or huXAG-3 polypeptide can be substantially purified by the one-step method described in Smith and Johnson, Gene 67:3 \ -40 (1988) The polypeptides of the present invention include the polypeptide encoded by the deposited cDNAs including the leader, the mature polypeptide encoded by the deposited the cDNAs minus the leader (i e , the mature protein), a polypeptide comprising amino acids about -20 to about 155 in SEQ ID NO 2, a polypeptide comprising amino acids about -19 to about 155 in SEQ ID NO 2, a polypeptide comprising amino acids about 1 to about 155 in SEQ ID NO 2 , a polypeptide comprising amino acids about -23 to about 149 in SEQ ID NO 4, a polypeptide comprising amino acids about -22 to about 149 in SEQ ID NO 4, a polypeptide comprising amino acids about 1 to about 149 in SEQ ID NO 4, a polypeptide comprising amino acids about -23 to about 143 in SEQ ID NO 6, a polypeptide comprising amino acids about -22 to about 143 in SEQ ID NO 6, a polypeptide comprising amino acids about 1 to about 143 in SEQ ID NO 6 as well as polypeptides which at least 95% identical, and more preferably at least 96%, 97%, 98% or 99% identical to the polypeptide encoded by the deposited cDNAs, to the polypeptide of SEQ ID NO:2, SEQ ID NO:4 or SEQ ID NO:6 and also include portions of such polypeptides with at least 30 amino acids and more preferably at least 50 amino acids. By a polypeptide having an amino acid sequence at least, for example, 95% "identical" to a reference amino acid sequence of a huXAG-l , huXAG-2 or huXAG-3 polypeptide is intended that the amino acid sequence of the polypeptide is identical to the reference sequence except that the polypeptide sequence may include up to five amino acid alterations per each 100 amino acids of the reference amino acid of the huXAG-l, huXAG-2 or huXAG-3 polypeptide. In other words, to obtain a polypeptide having an amino acid sequence at least 95% identical to a reference amino acid sequence, up to 5% of the amino acid residues in the reference sequence may be deleted or substituted with another amino acid, or a number of amino acids up to 5% of the total amino acid residues in the reference sequence may be inserted into the reference sequence. These alterations of the reference sequence may occur at the amino or carboxy terminal positions of the reference amino acid sequence or anywhere between those terminal positions, interspersed either individually among residues in the reference sequence or in one or more contiguous groups within the reference sequence As a practical matter, whether any particular polypeptide is at least 95%, 96%, 97%, 98% or 99% identical to, for instance, the amino acid sequence shown in SEQ LD NO:2, SEQ ED NO:4 or SEQ ID NO 6 or to the amino acid sequence encoded by deposited cDNA clones can be determined conventionally using known computer programs such the Bestfit program (Wisconsin Sequence Analysis Package, Version 8 for Unix, Genetics Computer Group, University Research Park, 575 Science Drive, Madison, WI 5371 1 ) When using Bestfit or any other sequence alignment program to determine whether a particular sequence is, for instance, 95% identical to a reference sequence according to the present invention, the parameters are set, of course, such that the percentage of identity is calculated over the full length of the reference amino acid sequence and that gaps in homology of up to 5% of the total number of amino acid residues in the reference sequence are allowed. The polypeptide of the present invention could be used as a molecular weight marker on SDS-PAGE gels or on molecular sieve gel filtration columns using methods well known to those of skill in the art. As described in detail below, the polypeptides of the present invention can also be used to raise polyclonal and monoclonal antibodies, which are useful in assays for detecting huXAG-l, huXAG-2 or huXAG-3 protein expression as described below or as agonists and antagonists capable of enhancing or inhibiting huXAG-l, huXAG-2 or huXAG-3 protein function. Further, such polypeptides can be used in the yeast two-hybrid system to "capture" huXAG-l, huXAG-2 or huXAG-3 protein binding proteins which are also candidate agonist and antagonist according to the present invention. The yeast two hybrid system is described in Fields and Song, Nature 340:245-246 (1989). In another aspect, the invention provides a peptide or polypeptide comprising an epitope-bearing portion of a polypeptide of the invention The epitope of this polypeptide portion is an immunogenic or antigenic epitope of a polypeptide of the invention. An "immunogenic epitope" is defined as a part of a protein that elicits an antibody response when the whole protein is the immunogen. These immunogenic epitopes are believed to be confined to a few loci on the molecule. On the other hand, a region of a protein molecule to which an antibody can bind is defined as an "antigenic epitope ." The number of immunogenic epitopes of a protein generally is less than the number of antigenic epitopes. See, for instance, Geysen et al., Proc. Natl. Acad. Sci. USA 81:3998- 4002 (1983). As to the selection of peptides or polypeptides bearing an antigenic epitope (i.e., that contain a region of a protein molecule to which an antibody can bind), it is well known in that art that relatively short synthetic peptides that mimic part of a protein sequence are routinely capable of eliciting an antiserum that reacts with the partially mimicked protein. See, for instance, Sutcliffe, J. G, Shinnick, T M , Green, N and Learner, R A (1983) Antibodies that react with predetermined sites on proteins. Science 219:660-666 Peptides capable of eliciting protein-reactive sera are frequently represented in the primary sequence of a protein, can be characterized by a set of simple chemical rules, and are confined neither to immunodominant regions of intact proteins (i e , immunogenic epitopes) nor to the amino or carboxyl terminals Peptides that are extremely hydrophobic and those of six or fewer residues generally are ineffective at inducing antibodies that bind to the mimicked protein; longer, peptides, especially those containing proline residues, usually are effective Sutcliffe et al., supra, at 661 For instance, 18 of 20 peptides designed according to these guidelines, containing 8-39 residues covering 75% of the sequence of the influenza virus hemagglutinin HA1 polypeptide chain, induced antibodies that reacted with the HA1 protein or intact virus, and 12/12 peptides from the MuLV polymerase and 18/18 from the rabies glycoprotein induced antibodies that precipitated the respective proteins Antigenic epitope-bearing peptides and polypeptides of the invention are therefore useful to raise antibodies, including monoclonal antibodies, that bind specifically to a polypeptide of the invention Thus, a high proportion of hybridomas obtained by fusion of spleen cells from donors immunized with an antigen epitope-bearing peptide generally secrete antibody reactive with the native protein Sutcliffe et al., supra, at 663 The antibodies raised by antigenic epitope-bearing peptides or polypeptides are useful to detect the mimicked protein, and antibodies to different peptides may be used for tracking the fate of various regions of a protein precursor which undergoes post-translational processing The peptides and anti-peptide antibodies may be used in a variety of qualitative or quantitative assays for the mimicked protein, for instance in competition assays since it has been shown that even short peptides (e g , about 9 amino acids) can bind and displace the larger peptides in immunoprecipitation assays See, for instance, Wilson et al., Cell 37 767-778 ( 1984) at 777 The anti- peptide antibodies of the invention also are useful for purification of the mimicked protein, for instance, by adsorption chromatography using methods well known in the art Antigenic epitope-bearing peptides and polypeptides of the invention designed according to the above guidelines preferably contain a sequence of at least seven, more preferably at least nine and most preferably between about 15 to about 30 amino acids contained within the amino acid sequence of a polypeptide of the invention However, peptides or polypeptides comprising a larger portion of an amino acid sequence of a polypeptide of the invention, containing about 30 to about 50 amino acids, or any length up to and including the entire amino acid sequence of a polypeptide of the invention, also are considered epitope-bearing peptides or polypeptides of the invention and also are useful for inducing antibodies that react with the mimicked protein Preferably, the amino acid sequence of the epitope-bearing peptide is selected to provide substantial solubility in aqueous solvents (i e , the sequence includes relatively hydrophilic residues and highly hydrophobic sequences are preferably avoided), and sequences containing proline residues are particularly preferred Non-limiting examples of antigenic polypeptides or peptides that can be used to generate huXAG-l-, huXAG-2 or hu-XAG-3 -specific antibodies include a polypeptide comprising amino acid residues from about - 1 to about 23 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 24 to about 32 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 41 to about 52 in SEQ ID NO.2, a polypeptide comprising amino acid residues from about 70 to about 83 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 93 to about 105 in SEQ LD NO 2, a polypeptide comprising amino acid residues from about 118 to about 130 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about -1 to about 15 in SEQ ID NO 4; a polypeptide comprising amino acid residues from about 20 to about 30 in SEQ LD NO 4, a polypeptide comprising amino acid residues from about 71 to about 89 in SEQ LD NO 4, a polypeptide comprising amino acid residues from about 97 to about 115 in SEQ ID NO 4, a polypeptide comprising amino acid residues from about 2 to about 21 in SEQ ID NO:6; a polypeptide comprising amino acid residues from about 81 to about 92 in SEQ ID NO:6; and a polypeptide comprising amino acid residues from about 109 to about 127 in SEQ LD NO:6. As indicated above, the inventors have determined that the above polypeptide fragments are antigenic regions of the huXAG-l, huXAG-2 and hu-XAG-3 proteins. The epitope-bearing peptides and polypeptides of the invention may be produced by any conventional means for making peptides or polypeptides including recombinant means using nucleic acid molecules of the invention. For instance, a short epitope-bearing amino acid sequence may be fused to a larger polypeptide which acts as a carrier during recombinant production and purification, as well as during immunization to produce anti-peptide antibodies. Epitope-bearing peptides also may be synthesized using known methods of chemical synthesis. For instance, Houghten has described a simple method for synthesis of large numbers of peptides, such as 10-20 mg of 248 different 13 residue peptides representing single amino acid variants of a segment of the HA1 polypeptide which were prepared and characterized (by ELISA-type binding studies) in less than four weeks. Houghten, R. A. (1985) General method for the rapid solid-phase synthesis of large numbers of peptides: specificity of antigen-antibody interaction at the level of individual amino acids. Proc. Natl. Acad. Sci. USA 52:5131-5135. This "Simultaneous Multiple Peptide Synthesis (SMPS)" process is further described in U.S. Patent No. 4,631,21 1 to Houghten etal. (1986). In this procedure the individual resins for the solid-phase synthesis of various peptides are contained in separate solvent-permeable packets, enabling the optimal use of the many identical repetitive steps involved in solid-phase methods. A completely manual procedure allows 500-1000 or more syntheses to be conducted simultaneously. Houghten et al., supra, at 5134. Epitope-bearing peptides and polypeptides of the invention are used to induce antibodies according to methods well known in the art. See, for instance, Sutcliffe et al., supra, Wilson et al, supra, Chow, M. et al, Proc. Natl. Acad. Sci. USA 52:910-914; and Bittle, F J. et al, J. Gen. Virol. 66.2347-2354 (1985). Generally, animals may be immunized with free peptide; however, anti-peptide antibody titer may be boosted by coupling of the peptide to a macromolecular carrier, such as keyhole limpet hemacyanin (KLH) or tetanus toxoid. For instance, peptides containing cysteine may be coupled to carrier using a linker such as m-maleimidobenzoyl-N-hydroxysuccinimide ester (MBS), while other peptides may be coupled to carrier using a more general linking agent such as glutaraldehyde. Animals such as rabbits, rats and mice are immunized with either free or carrier-coupled peptides, for instance, by intraperitoneal and/or intradermal injection of emulsions containing about 100 μg peptide or carrier protein and Freund's adjuvant Several booster injections may be needed, for instance, at intervals of about two weeks, to provide a useful titer of anti-peptide antibody which can be detected, for example, by ELISA assay using free peptide adsorbed to a solid surface. The titer of anti-peptide antibodies in serum from an immunized animal may be increased by selection of anti-peptide antibodies, for instance, by adsorption to the peptide on a solid support and elution of the selected antibodies according to methods well known in the art Immunogenic epitope-bearing peptides of the invention, i.e , those parts of a protein that elicit an antibody response when the whole protein is the immunogen, are identified according to methods known in the art. For instance, Geysen elal, supra, discloses a procedure for rapid concurrent synthesis on solid supports of hundreds of peptides of sufficient purity to react in an enzyme-linked immunosorbent assay. Interaction of synthesized peptides with antibodies is then easily detected without removing them from the support. In this manner a peptide bearing an immunogenic epitope of a desired protein may be identified routinely by one of ordinary skill in the art. For instance, the immunologically important epitope in the coat protein of foot-and-mouth disease virus was located by Geysen et al. supra with a resolution of seven amino acids by synthesis of an overlapping set of all 208 possible hexapeptides covering the entire 213 amino acid sequence of the protein. Then, a complete replacement set of peptides in which all 20 amino acids were substituted in turn at every position within the epitope were synthesized, and the particular amino acids conferring specificity for the reaction with antibody were determined Thus, peptide analogs of the epitope-bearing peptides of the invention can be made routinely by this method U.S Patent No 4,708,781 to Geysen (1987) further describes this method of identifying a peptide bearing an immunogenic epitope of a desired protein Further still, U S Patent No 5, 194,392 to Geysen (1990) describes a general method of detecting or determining the sequence of monomers (amino acids or other compounds) which is a topological equivalent of the epitope (i e , a "mimotope") which is complementary to a particular paratope (antigen binding site) of an antibody of interest More generally, U S Patent No 4,433,092 to Geysen (1989) describes a method of detecting or determining a sequence of monomers which is a topographical equivalent of a ligand which is complementary to the ligand binding site of a particular receptor of interest Similarly, U S Patent No 5,480,971 to Houghten, R A et al. (1996) on Peralkylated Oligopeptide Mixtures discloses linear C,-C 7 -alkyl peralkylated oligopeptides and sets and libraries of such peptides, as well as methods for using such oligopeptide sets and libraries for determining the sequence of a peralkylated oligopeptide that preferentially binds to an acceptor molecule of interest Thus, non-peptide analogs of the epitope-bearing peptides of the invention also can be made routinely by these methods The entire disclosure of each document cited in this section on "Polypeptides and Peptides" is hereby incorporated herein by reference As one of skill in the art will appreciate, huXAG-l, huXAG-2 and huXAG-3 polypeptides of the present invention and the epitope-bearing fragments thereof described above can be combined with parts of the constant domain of immunoglobulins (IgG), resulting in chimeric polypeptides These fusion proteins facilitate purification and show an increased half-life in vivo. This has been shown, e g., for chimeric proteins consisting of the first two domains of the human CD4-polypeptide and various domains of the constant regions of the heavy or light chains of mammalian immunoglobulins (EPA 394,827, Traunecker et al, Nature 331:84- 86 (1988)). Fusion proteins that have a disulfide-linked dimeric structure due to the IgG part can also be more efficient in binding and neutralizing other molecules than the onomeric huXAG-l, huXAG-2 or huXAG-3 protein or protein fragment alone (Fountoulakis et al, J. Biochem 270.3958-3964 (1995)) Diagnostic and Therapeutic Applications of huXAG- huXAG-2 and huXAG-3 The present inventors have identified a novel family of human growth factors, consisting of three members huXAG-l, huXAG-2 and huXAG-3 These proteins share homology with the XAG protein of Xenopus laevis, which is involved in embryogenesis and is expressed in adult tissue Overexpression of growth factors can lead to disease states, such as cancer Underexpression of growth factors can also be detrimental, for example, in damaged tissue Expression of huXAG-l has been discovered in colon cancer tissue However, no corresponding gene expression was found in normal colon tissue Thus, the huXAG-l gene of the present invention provides a molecular marker for colon cancer, including polypoisis and non-polypoisis cancer huXAG-l gene expression can be detected in colon tissue or bodily fluids (i e., sera, plasma, urine, synovial fluid or spinal fluid) taken from an individual suspected of having colon cancer Thus, the invention provides a diagnostic method useful during diagnosis of colon cancer, which involves measuring the expression level of the gene encoding the huXAG-l protein in colon tissue or body fluid from a first individual and comparing the measured gene expression level with a standard huXAG-l gene expression level taken from one or more individuals known not to have colon cancer whereby an increase in the gene expression level compared to the standard is indicative of colon cancer. As indicated, since huXAG-l gene expression in normal colon tissue has not been detected, the standard expression level will be significantly lower than the expression level of huXAG- 1 in an individual with colon cancer. Where a tumor diagnosis has already been made according to conventional methods, the present invention is useful as a prognostic indicator, whereby patients exhibiting enhanced huXAG-l gene expression will experience a worse clinical outcome relative to patients expressing the gene at a lower level. The present invention also relates to a diagnostic assay for detecting altered levels of huXAG-2 or huXAG-3 protein in various tissues since an overexpression of the proteins compared to normal control tissue samples can detect the presence of a disease or susceptibility to a disease, for example, a tumor. Thus, the present invention provides a diagnostic method which involves measuring the expression level of the gene encoding huXAG-2 or huXAG-3 in tissue or body fluid taken from a first individual and comparing the measured gene expression level with a standard huXAG-2 or huXAG-3 gene expression level taken from one or more individuals known not to have the disease being diagnosed, whereby an increase in the gene expression level compared to the standard is indicative of disease. By "assaying the expression level of the gene encoding the huXAG-l, huXAG-2 or huXAG-3 protein" is intended qualitatively or quantitatively measuring or estimating the level of the huXAG-l , huXAG-2, or huXAG-3 protein or the level of the mRNA encoding the huXAG-l, huXAG-2, or huXAG-3 protein in a first biological sample either directly (e.g., by determining or estimating absolute protein level or mRNA level) or relatively (e.g., by comparing to the huXAG-l, huXAG-2 or huXAG-3 protein level or mRNA level in a second biological sample). Preferably, the huXAG-l, huXAG-2 or huXAG-3 protein level or mRNA level in the first biological sample is measured or estimated and compared to a standard huXAG-l, huXAG-2, or huXAG-3 protein level or mRNA level, the standard being taken from a second biological sample obtained from an individual not having the disease. As will be appreciated in the art, once a standard huXAG-1, huXAG-2, or huXAG-3 protein level or mRNA level is known, it can be used repeatedly as a standard for comparison. By "biological sample" is intended any biological sample obtained from an individual, cell line, tissue culture, or other source which contains huXAG-l, huXAG-2 or huXAG-3 protein or mRNA. Biological samples include mammalian body fluids (such as sera, plasma, urine, synovial fluid and spinal fluid) which contain secreted mature huXAG-l, huXAG-2 or huXAG-3 protein, and tissue. Preferred tissue for huXAG-l expression detection is colon tissue. Methods for obtaining tissue biopsies and body fluids from mammals are well known in the art. Where the biological sample is to include mRNA, a tissue biopsy is the preferred source. The present invention is useful for detecting cancer in mammals. In one preferred embodiment, the invention is useful during diagnosis of the of colon cancer in mammals. Preferred mammals include monkeys, apes, cats, dogs, cows, pigs, horses, rabbits and humans. Particularly preferred are humans. Total cellular RNA can be isolated from a biological sample using any suitable technique such as the single-step guanidinium-thiocyanate-phenol- chloroform method described in Chomczynski and Sacchi, Anal Biochem. 162:156-159 (1987). Levels of mRNA encoding the huXAG-l, huXAG-2 or huXAG-3 protein are then assayed using any appropriate method. These include Northern blot analysis, SI nuciease mapping, the polymerase chain reaction (PCR), reverse transcription in combination with the polymerase chain reaction (RT-PCR), and reverse transcription in combination with the ligase chain reaction (RT-LCR). Northern blot analysis can be performed as described in Harada et al, Cell 63:303-312 (1990). Briefly, total RNA is prepared from a biological sample as described above. For the Northern blot, the RNA is denatured in an appropriate buffer (such as glyoxal/dimethyl sulfoxide/sodium phosphate buffer), subjected to agarose gel electrophoresis, and transferred onto a nitrocellulose filter. After the RNAs have been linked to the filter by a UV linker, the filter is prehybridized in a solution containing formamide, SSC, Denhardt's solution, denatured salmon sperm, SDS, and sodium phosphate buffer huXAG-l, huXAG-2 or huXAG-3 protein cDNA labeled according to any appropriate method (such as the 32 P-multiprimed DNA labeling system (Amersham)) is used as probe. After hybridization overnight, the filter is washed and exposed to x-ray film cDNA for use as probe according to the present invention is described in the sections above and will preferably at least 15 bp in length SI mapping can be performed as described in Fujita el al, Cell 49:351- 367 (1987) To prepare probe DNA for use in S I mapping, the sense strand of above-described cDNA is used as a template to synthesize labeled antisense DNA The antisense DNA can then be digested using an appropriate restriction endonuclease to generate further DNA probes of a desired length Such antisense probes are useful for visualizing protected bands corresponding to the target mRNA (i e , mRNA encoding the huXAG-l, huXAG-2 or huXAG-3 protein) Northern blot analysis can be performed as described above Preferably, levels of mRNA encoding the huXAG-l, huXAG-2 or huXAG- 3 protein are assayed using the RT-PCR method described in Makino el al, Technique 2:295-301 (1990) By this method, the radioactivities of the "amplicons" in the polyacrylamide gel bands are linearly related to the initial concentration of the target mRNA Briefly, this method involves adding total RNA isolated from a biological sample in a reaction mixture containing a RT primer and appropriate buffer After incubating for primer annealing, the mixture can be supplemented with a RT buffer, dNTPs, DTT, RNase inhibitor and reverse transcriptase. After incubation to achieve reverse transcription of the RNA, the RT products are then subject to PCR using labeled primers Alternatively, rather than labeling the primers, a labeled dNTP can be included in the PCR reaction mixture PCR amplification can be performed in a D A thermal cycler according to conventional techniques After a suitable number of rounds to achieve amplification, the PCR reaction mixture is electrophoresed on a polyacrylamide gel After drying the gel, the radioactivity of the appropriate bands (corresponding to the mRNA encoding the huXAG-l, huXAG-2 or huXAG-3 protein) is quantified using an imaging analyzer RT and PCR reaction ingredients and conditions, reagent and gel concentrations, and labeling methods are well known in the art Variations on the RT-PCR method will be apparent to the skilled artisan Any set of oligonucleotide primers which will amplify reverse transcribed target mRNA can be used and can be designed as described in the sections above Assaying huXAG-l, huXAG-2 or huXAG-3 protein levels in a biological sample can occur using any art-known method Preferred for assaying huXAG-l , huXAG-2 or huXAG-3 protein levels in a biological sample are antibody-based techniques For example, huXAG-l, huXAG-2 or huXAG-3 protein expression in tissues can be studied with classical immunohistological methods In these, the specific recognition is provided by the primary antibody (polyclonal or monoclonal) but the secondary detection system can utilize fluorescent, enzyme, or other conjugated secondary antibodies As a result, an immunohistological staining of tissue section for pathological examination is obtained Tissues can also be extracted, e.g , with urea and neutral detergent, for the liberation of huXAG-l, huXAG-2 or huXAG-3 protein for Western-blot or dot/slot assay (Jalkanen, M„ et al, J. Cell. Biol 101:916-985 (1985), Jalkanen, M , et al, J. Cell . Biol. 105:3081-3096 (1987)) In this technique, which is based on the use of cationic solid phases, quantitation of huXAG-l, huXAG-2 or huXAG-3 protein can be accomplished using isolated huXAG- l, huXAG-2 or huXAG-3 protein, respectively, as a standard This technique can also be applied to body fluids With these samples, a molar concentration of huXAG- l, huXAG-2 or huXAG-3 protein will aid to set standard values of huXAG- 1 , huXAG-2 or huXAG-3 protein content, respectively, for different body fluids, like serum, plasma, urine, spinal fluid, etc The normal appearance of huXAG-l, huXAG-2 or huXAG-3 protein amounts can then be set using values from healthy individuals, which can be compared to those obtained from a test subject Other antibody-based methods useful for detecting huXAG- 1 , huXAG-2 or huXAG-3 protein gene expression include immunoassays, such as the enzyme linked immunosorbent assay (ELISA) and the radioimmunoassay (RIA) For example, huXAG-l , huXAG-2 or huXAG-3 protein-specific monoclonal antibodies can be used both as an immunoabsorbent and as an enzyme-labeled probe to detect and quantify the huXAG-l, huXAG-2 or huXAG-3 protein, respectively The amount of huXAG-l, huXAG-2 or huXAG-3 protein present in the sample can be calculated by reference to the amount present in a standard preparation using a linear regression computer algorithm Such an ELISA for detecting a tumor antigen is described in lacobelli et al. Breast Cancer Research and Treatment 77:19-30 (1988) In another ELISA assay, two distinct specific monoclonal antibodies can be used to detect huXAG- l, huXAG-2 or huXAG-3 protein in a body fluid In this assay, one of the antibodies is used as the immunoabsorbent and the other as the enzyme-labeled probe The above techniques may be conducted essentially as a "one-step" or "two-step" assay The "one-step" assay involves contacting huXAG-l, huXAG-2 or huXAG-3 protein with immobilized antibody and, without washing, contacting the mixture with the labeled antibody The "two-step" assay involves washing before contacting the mixture with the labeled antibody Other conventional methods may also be employed as suitable It is usually desirable to immobilize one component of the assay system on a support, thereby allowing other components of the system to be brought into contact with the component and readily removed from the sample Suitable enzyme labels include, for example, those from the oxidase group, which catalyze the production of hydrogen peroxide by reacting with substrate Glucose oxidase is particularly preferred as it has good stability and its substrate (glucose) is readily available Activity of an oxidase label may be assayed by measuring the concentration of hydrogen peroxide formed by the enzyme-labeled antibody/substrate reaction Besides enzymes, other suitable labels include radioisotopes, such as iodine ( 125 I, uι l), carbon ( 14 C), sulphur ("S), tritium ( 3 H), indium ( m Ln), and technetium ( 99ra Tc), and fluorescent labels, such as fluorescein and rhodamine, and biotin In addition to assaying huXAG-l, huXAG-2 or huXAG-3 protein levels in a biological sample obtained from an individual, huXAG-l, huXAG-2 or huXAG-3 protein can also be detected in vivo by imaging Antibody labels or markers for in vivo imaging of huXAG-l, huXAG-2 or huXAG-3 protein include those detectable by X-radiography, NMR or ESR For X-radiography, suitable labels include radioisotopes such as barium or cesium, which emit detectable radiation but are not overtly harmful to the subject Suitable markers for NMR and ESR include those with a detectable characteristic spin, such as deuterium, which may be incorporated into the antibody by labeling of nutrients for the relevant hybridoma A huXAG-l, huXAG-2 or huXAG-3 protein-specific antibody or antibody fragment which has been labeled with an appropriate detectable imaging moiety, such as a radioisotope (for example, 131 I, "'In, 99m Tc), a radio-opaque substance, or a material detectable by nuclear magnetic resonance, is introduced (for example, parenterally, subcutaneously or intrapeπtoneally) into the mammal to be examined for cancer It will be understood in the art that the size of the subject and the imaging system used will determine the quantity of imaging moiety needed to produce diagnostic images In the case of a radioisotope moiety, for a human subject, the quantity of radioactivity injected will normally range from about 5 to 20 millicuries of 99m Tc The labeled antibody or antibody fragment will then preferentially accumulate at the location of cells which contain huXAG-l, huXAG-2 or huXAG-3 protein, respectively In vivo tumor imaging is described in S W. Burchiel et al, "Immunopharmacokinetics of Radiolabelled Antibodies and Their Fragments" (Chapter 13 in Tumor Imaging: The Radiochemical Detection of Cancer, S W. Burchiel and B A Rhodes, eds , Masson Publishing Inc (1982)) A huXAG-l-, huXAG-2- or huXAG-3 -protein specific antibody for use in the present invention can be raised against the intact huXAG-l, huXAG-2 or huXAG-3 protein or an antigenic polypeptide fragment thereof, which may presented together with a carrier protein, such as an albumin, to an animal system (such as rabbit or mouse) or, if it is long enough (at least about 25 amino acids), without a carrier As used herein, the term "antibody" (Ab) or "monoclonal antibody" (Mab) is meant to include intact molecules as well as antibody fragments (such as, for example, Fab and F(ab') 2 fragments) which are capable of specifically binding to huXAG-l, huXAG-2 or huXAG-3 protein. Fab and F(ab') 2 fragments lack the Fc fragment of intact antibody, clear more rapidly from the circulation, and may have less non-specific tissue binding of an intact antibody (Wahl et al, J. Nucl. Med. 24 316-325 (1983)) Thus, these fragments are preferred The antibodies of the present invention may be prepared by any of a variety of methods For example, cells expressing the huXAG- 1 , huXAG-2 or huXAG-3 protein or an antigenic fragment thereof can be administered to an animal in order to induce the production of sera containing polyclonal antibodies In a preferred method, a preparation of huXAG-l, huXAG-2 or huXAG-3 protein is prepared and purified to render it substantially free of natural contaminants Such a preparation is then introduced into an animal in order to produce polyclonal antisera of greater specific activity In the most preferred method, the antibodies of the present invention are monoclonal antibodies (or huXAG-l, huXAG-2 or huXAG-3 protein binding fragments thereof) Such monoclonal antibodies can be prepared using hybridoma technology (Kohler etal, Nature 256:495 (1975), Kohler et al, Eur. J. Immunol. 6:51 1 (1976); Kohler et al, Eur. J. Immunol 6 292 (1976), Hammerling et al, In Monoclonal Antibodies and T-Cell Hybridomas, Elsevier, N Y , ( 1981 ) pp 563-681 ) In general, such procedures involve immunizing an animal (preferably a mouse) with a huXAG-l, huXAG-2 or huXAG-3 protein antigen or, more preferably, with a huXAG-l, huXAG-2 or huXAG-3 protein-expressing cell Suitable cells can be recognized by their capacity to bind anti-huXAG- 1 , anti- huXAG-2 or anti-huXAG-3 protein antibody Such cells may be cultured in any suitable tissue culture medium; however, it is preferable to culture cells in Earle's modified Eagle's medium supplemented with 10% fetal bovine serum (inactivated at about 56°C), and supplemented with about 10 g/1 of nonessential amino acids, about 1 ,000 U/ml of penicillin, and about 100 μg/ml of streptomycin. The splenocytes of such mice are extracted and fused with a suitable myeloma cell line. Any suitable myeloma cell line may be employed in accordance with the present invention; however, it is preferable to employ the parent myeloma cell line (SP 2 O), available from the American Type Culture Collection, Rockville, Maryland. After fusion, the resulting hybridoma cells are selectively maintained in HAT medium, and then cloned by limiting dilution as described by Wands et al. (Gastroenterology 50:225-232 (1981)). The hybridoma cells obtained through such a selection are then assayed to identify clones which secrete antibodies capable of binding a huXAG-l, huXAG-2 or huXAG-3 protein antigen. Alternatively, additional antibodies capable of binding to a huXAG-l , huXAG-2 or huXAG-3 protein antigen may be produced in a two-step procedure through the use of anti-idiotypic antibodies Such a method makes use of the fact that antibodies are themselves antigens, and that, therefore, it is possible to obtain an antibody which binds to a second antibody In accordance with this method, huXAG-l-, huXAG-2- or huXAG-3 -protein specific antibodies are used to immunize an animal, preferably a mouse. The splenocytes of such an animal are then used to produce hybridoma cells, and the hybridoma cells are screened to identify clones which produce an antibody whose ability to bind to a huXAG- 1 , huXAG-2 or huXAG-3 protein-specific antibody can be blocked by a huXAG-l, huXAG-2 or huXAG-3 protein antigen, respectively. Such antibodies comprise anti-idiotypic antibodies to a huXAG- 1 , huX AG-2 or huXAG-3 protein-specific antibody and can be used to immunize an animal to induce formation of further huXAG-l, huXAG-2 or huXAG-3 protein-specific antibodies It will be appreciated that Fab and F(ab') 2 and other fragments of the antibodies of the present invention may be used according to the methods disclosed herein. Such fragments are typically produced by proteolytic cleavage, using enzymes such as papain (to produce Fab fragments) or pepsin (to produce F(ab') 2 fragments) Alternatively, huXAG-1 , huXAG-2 or huXAG-3 protein-binding fragments can be produced through the application of recombinant DNA technology or through synthetic chemistry Where in vivo imaging is used to detect enhanced levels of huXAG-l, huXAG-2 or huXAG-3 protein for tumor diagnosis in humans, it may be preferable to use "humanized" chimeric monoclonal antibodies Such antibodies can be produced using genetic constructs derived from hybridoma cells producing the monoclonal antibodies described above Methods for producing chimeric antibodies are known in the art See, for review, Morrison, Science 229:1202 (1985), Oi et al, BioTechniques 4:2\4 (1986), Cabilly et al, U S Patent No 4,816,567, Taniguchi et al, EP 171496; Morrison et al, EP 173494, Neuberger et al, WO 8601533, Robinson et al, WO 8702671 , Boulianne et al, Nature 312 643 (1984), Neuberger et al, Nature 314:268 ( 1985) Further suitable labels for the huXAG-l , huXAG-2 or huXAG-3 protein-specific antibodies of the present invention are provided below Examples of suitable enzyme labels include malate dehydrogenase, staphylococcal nuclease, delta-5-steroid isomerase, yeast-alcohol dehydrogenase, alpha-glycerol phosphate dehydrogenase, triose phosphate isomerase, peroxidase, alkaline phosphatase, asparaginase, glucose oxidase, beta-galactosidase, ribonuclease, urease, catalase, glucose-6-phosphate dehydrogenase, glucoamylase, and acetylcholine esterase Examples of suitable radioisotopic labels include 3 H, l u In, 99m Tc, 125 I, 131 I, 32p 35 S , Cj 5I Cr> 57^ 58^ 5^ 75^ . ^ 9 γ 6 ^ 217Q 21 ,^ 2^ 7^ l09 Pd, etc '"In and 99ra Tc are preferred isotopes where in vivo imaging is used since it avoids the problem of dehalogenation of the l25 I or 13l I-labeled monoclonal antibody by the liver In addition, theses radionucleotides have a more favorable gamma emission energy for imaging (Perkins et al, Eur. J. Nucl. Med. 10 296-301 (1985); Carasquillo et al, J. Nucl. Med. 25.281-287 (1987)) For example, '"In coupled to monoclonal antibodies with l-(p-isothiocyanatobenzyl)-DPTA has shown little uptake in non-tumorous tissues, particularly the liver, and therefore enhances specificity of tumor localization (Esteban et al, J. Nucl. Med. 25 861-870 (1987)). Examples of suitable non-radioactive isotopic labels include 157 Gd, 55 Mn, 162 Dy, 52 Tr, and 56 Fe Examples of suitable fluorescent labels include an ,52 Eu label, a fluorescein label, an isothiocyanate label, a rhodamine label, a phycoerythrin label, a phycocyanin label, an allophycocyanin label, an o-phthaldehyde label, and a fluorescamine label. Examples of suitable toxin labels include diphtheria toxin, ricin, and cholera toxin Examples of chemiluminescent labels include a luminal label, an isoluminal label, an aromatic acridinium ester label, an imidazole label, an acridinium salt label, an oxalate ester label, a luciferin label, a iuciferase label, and an aequorin label Examples of nuclear magnetic resonance contrasting agents include heavy metal nuclei such as Gd, Mn, and iron Typical techniques for binding the above-described labels to antibodies are provided by Kennedy et al, C n. Chi . Ada 70 1 -3 1 ( 1976), and Schurs et al, Clin. Chim. Ada 81 1-40 (1977) Coupling techniques mentioned in the latter are the glutaraldehyde method, the periodate method, the dimaleimide method, the m-maleimidobenzyl-N-hydroxy-succinimide ester method, all of which methods are incorporated by reference herein The polypeptides of the present invention are growth factors and, as such, can be used to stimulate proliferation of cells, for example, colon, breast, liver, and lung cells Due to the homology of huXAG-l, huXAG-2 and huXAG-3 with Xenopus XAG these genes are believed to be morphogens involved with growth and development of the human embryo and also in adult life Further, these genes are highly expressed in many tumor types including osteoclastoma, breast cancer, colon cancer, and hepatocellular carcinoma. They are also expressed in the human lung. The polypeptides of the present invention can be employed to stimulate proliferation and differentiation of hepatocytes, and thus, could be used to alleviate or treat liver diseases and pathologies such as fulminant liver failure caused by cirrhosis, liver damage caused by viral hepatitis and toxic substances (i.e., acetaminophen, carbon tetrachloride and other hepatotoxins known in the art). The polypeptides of the present invention can also be used to stimulate or promote liver regeneration, for example, after surgery The polypeptides of the present invention can be used to prevent and heal damage to the lungs caused by various pathological states As growth factors, the polypeptides of the present invention could stimulate proliferation and differentiation and promote the repair of alveoli and bronchiolar epithelium to prevent, attenuate, or treat acute or chronic lung damage. For example, emphysema, which results in the progressive loss of alveoli, and inhalation injuries, i.e., resulting from smoke inhalation and burns, that cause necrosis of the bronchiolar epithelium and alveoli could be effectively treated using the polypeptides of the present invention. huXAG-3 is preferably employed to promote the growth of lung tissue. The polypeptides of the present invention could also stimulate the proliferation and differentiation of breast tissue and could therefor be used to promote healing of breast tissue injury due to surgery, trauma, or cancer This invention also provides a method for identification of the receptors for a huXAG-l, huXAG-2 or huXAG-3 polypeptide The gene encoding the receptor can be identified by numerous methods known to those of skill in the art, for example, ligand panning and FACS sorting (Coligan el al. Current Protocols m lmmun., 1(2), Chapter 5 (1991)). Preferably, expression cloning is employed wherein polyadenylated RNA is prepared from a cell responsive to the polypeptides, and a cDNA library created from this RNA is divided into pools and used to transfect COS cells or other cells that are not responsive to the polypeptides. Transfected cells which are grown on glass slides are exposed to the labeled polypeptides. The polypeptides can be labeled by a variety of means including iodination or inclusion of a recognition site for a site-specific protein kinase. Following fixation and incubation, the slides are subjected to autoradiographic analysis. Positive pools are identified and sub-pools are prepared and re-transfected using an iterative sub-pooling and rescreening process, eventually yielding a single clones that encodes the putative receptor. As an alternative approach for receptor identification, the labeled polypeptides can be photoaffinity linked with cell membrane or extract preparations that express the receptor molecule. Cross-linked material is resolved by PAGE analysis and exposed to x-ray film The labeled complex containing the receptors of the polypeptides can be excised, resolved into peptide fragments, and subjected to protein microsequencing The amino acid sequence obtained from microsequencing would be used to design a set of degenerate oligonucleotide probes to screen a cDNA library to identify the genes encoding the putative receptors. This invention provides a method of screening compounds to identify those which agonize the action of huXAG- 1 , huXAG-2 or huXAG-3 or block the function of huXAG-l, huXAG-2 or huXAG-3 An example of such an assay comprises combining a mammalian cell, for example, a colon cell, the compound to be screened and 3 [H] thymidine under cell culture conditions where the cell would normally proliferate. A control assay may be performed in the absence of the compound to be screened and compared to the amount of cellular proliferation in the presence of the compound to determine if the compound stimulates cellular proliferation. To screen for antagonists, the same assay may be prepared in the presence of huXAG-l, huXAG-2 or huXAG-3 and the ability of the compound to prevent cellular proliferation is measured and a determination of antagonist ability is made The amount of cellular proliferation is measured by liquid scintillation chromatography which measures the incorporation of λ [H] thymidine Ln another method, a mammalian cell or membrane preparation expressing a huXAG-l, huXAG-2 or huXAG-3 receptor would be incubated with labeled huXAG-l, huXAG-2 or huXAG-3 in the presence of the compound. The ability of the compound to enhance or block this interaction could then be measured. Alternatively, the response of a known second messenger system following interaction of huXAG-l, huXAG-2 or huXAG-3 and receptor would be measured and compared in the presence or absence of the compound. Such second messenger systems include but are not limited to, cAMP guanylate cyclase, ion channels or phosphoinositide hydrolysis. Examples of potential huXAG-l, huXAG-2 or huXAG-3 antagonists include an antibody, or in some cases, an oligonucleotide, which binds to the polypeptide. Alternatively, a potential huXAG-l, huXAG-2 or huXAG-3 antagonist may be a mutant form of huXAG-I , huXAG-2 or huXAG-3 which binds to huXAG-l, huXAG-2 or huXAG-3 receptors, yet elicits no second messenger response. Therefore the action of huXAG- 1 , huXAG-2 or huXAG-3 is effectively blocked. Antagonists of huXAG-l, huXAG-2 or huXAG-3 are contemplated to be useful for inhibiting tumor growth Tumor growth that is related to the misexpression of a developmental morphogen, such as huXAG- l, huXAG-2 or huXAG-3 can be decreased or prevented by turning off the expression of these polypeptides in adult tissue. Another potential huXAG-l, huXAG-2 or huXAG-3 antagonist is an antisense construct prepared using antisense technology Antisense technology can be used to control gene expression through triple-helix formation or antisense DNA or RNA, both of which methods are based on binding of a polynucleotide to DNA or RNA. For example, the 5' coding portion of the polynucleotide sequence, which encodes for the mature polypeptides of the present invention, is used to design an antisense RNA oligonucleotide of from about 10 to 40 base pairs in length. A DNA oligonucleotide is designed to be complementary to a region of the gene involved in transcription (triple helix - see Lee et al, Nucl. AcidsRes. 6 3073 (1979), Cooney et al, Science 241 456 (1988), and Dervan et al, Science 251 1360 (1991)), thereby preventing transcription and the production of huXAG-l, huXAG-2 or huXAG-3 The antisense RNA oligonucleotide hybridizes to the cDNA in vivo and blocks translation of the cD A molecule into huXAG-l, huXAG-2 or huXAG-3 polypeptide (Antisense - Okano, J., Neurochem. 56- 560 (1991), Oligodeoxynucleotides as Antisense Inhibitors of Gene Expression, CRC Press, Boca Raton, FL (1988)) The oligonucleotides described above can also be delivered to cells such that the antisense RNA or DNA may be expressed m vivo to inhibit production of huXAG- l, huXAG-2 or huXAG-3 Potential huXAG-l, huXAG-2 or huXAG-3 antagonists include small molecules which bind to and occupy the binding site of a huXAG-l, huXAG-2 or huXAG-3 receptor thereby making the receptor inaccessible to huXAG-l, huXAG-2 or huXAG-3 such that normal biological activity is prevented Examples of small molecules include but are not limited to small peptides or peptide-like molecules Antagonists of huXAG- 1 , huXAG-2 or huX AG-3 can be employed to treat hyperproliferative disorders, including cancer, in particular hepatocellular carcinoma, osteoclastoma, breast cancer, and colon cancer Modes of administration It will be appreciated that conditions caused by a decrease in the standard or normal level of huXAG-l, huXAG-2 or huXAG-3 activity in an individual, or conditions that can be ameliorated by enhanced levels of huXAG-l, huXAG-2 or huXAG-3 activity, can be treated by administration of huXAG- 1 , huXAG-2 or huXAG-3 protein, respectively. Thus, the invention further provides a method of treating an individual in need of an increased level of huXAG-l, huXAG-2 or huXAG-3 activity comprising administering to such an individual a pharmaceutical composition comprising an effective amount of an isolated huXAG-l, huXAG-2 or huXAG-3 polypeptide of the invention, respectively Particularly preferred is a mature form of the huXAG- 1 , huXAG-2 or huX AG-3 protein, effective to increase the huXAG-l, huXAG-2 or huXAG-3 activity level in such an individual Such treatments are contemplated to be particularly useful in the stimulation of tissue regrowth in the lungs, liver, colon and bones The huXAG-l, huXAG-2 or huXAG-3 polypeptide composition will be formulated and dosed in a fashion consistent with good medical practice, taking into account the clinical condition of the individual patient (especially the side effects of treatment with huXAG-l, huXAG-2 or huXAG-3 polypeptide alone), the site of delivery of the huXAG-l, huXAG-2 or huXAG-3 polypeptide composition, the method of administration, the scheduling of administration, and other factors known to practitioners The "effective amount" of huXAG- l , huXAG-2 or huXAG-3 polypeptide for purposes herein is thus determined by such considerations As a general proposition, the total pharmaceutically effective amount of huXAG-l, huXAG-2 or huXAG-3 polypeptide administered parenterally per dose will be in the range of about 1 μg/kg/day to 10 mg/kg/day of patient body weight, although, as noted above, this will be subject to therapeutic discretion More preferably, this dose is at least 0 01 mg/kg/day, and most preferably for humans between about 001 and 1 mg/kg/day for the hormone If given continuously, the huXAG-l, huXAG-2 or huXAG-3 polypeptide is typically administered at a dose rate of about 1 μg/kg/hour to about 50 μg/kg/hour, either by 1 -4 injections per day or by continuous subcutaneous infusions, for example, using a mini-pump An intravenous bag solution may also be employed The length of treatment needed to observe changes and the interval following treatment for responses to occur appears to vary depending on the desired effect Pharmaceutical compositions containing a huXAG- l , huXAG-2 or huXAG-3 polypeptide of the invention may be administered orally, rectally, parenterally, intracistemally, intravaginally, intraperitoneally, topically (as by powders, ointments, drops or transdermal patch), bucally, or as an oral or nasal spray. By "pharmaceutically acceptable carrier" is meant a non-toxic solid, semisolid or liquid filler, diluent, encapsulating material or formulation auxiliary of any type The term "parenteral" as used herein refers to modes of administration which include intravenous, intramuscular, intraperitoneal, intrasternal, subcutaneous and intraarticular injection and infusion A huXAG-l, huXAG-2 or huXAG-3 polypeptide is also suitably administered by sustained-release systems Suitable examples of sustained-release compositions include semi-permeable polymer matrices in the form of shaped articles, e.g , films, or mirocapsules Sustained-release matrices include polylactides (U.S. Pat No 3,773,919, EP 58,481), copoly ers of L-glutamic acid and gamma-ethyl-L-glutamate (Sidman, U et al, Biopolymers 22 547-556 (1983)), poly (2- hydroxyethyl methacrylate) (R Langer et al, J. Biomed. Mater. Res. 15 167-277 (1981), and R Langer, Chem. Tech. 12 98-105 (1982)), ethylene vinyl acetate (R. Langer et al, Id.) or poly-D- (-)-3-hydroxybutyric acid (EP 133,988) Sustained-release huXAG-l , huXAG-2 or huXAG-3 polypeptide compositions also include liposomaliy entrapped huXAG- 1 , huXAG-2 or huXAG- 3 polypeptide Liposomes containing huXAG-l, huXAG-2 or huXAG-3 polypeptide are prepared by methods known per se DE 3,218, 121 , Epstein et al, Proc. Natl. Acad. Sci. (USA) 82 3688-3692 ( 1985), Hwang et al, Proc. Natl. Acad. Sci. (USA) 774030-4034 (1980), EP 52,322, EP 36,676, EP 88,046, EP 143,949, EP 142,641 , Japanese Pat Appl 83-1 18008, U S Pat Nos 4,485,045 and 4,544,545, and EP 102,324 Ordinarily, the liposomes are of the small (about 200-800 Angstroms) unilamellar type in which the lipid content is greater than about 30 mol. percent cholesterol, the selected proportion being adjusted for the optimal huXAG-l, huXAG-2 or huXAG-3 polypeptide therapy For parenteral administration, in one embodiment, a huXAG-l , huXAG-2 or huXAG-3 polypeptide is formulated generally by mixing it at the desired degree of purity, in a unit dosage injectable form (solution, suspension, or emulsion), with a pharmaceutically acceptable carrier, i.e , one that is non-toxic to recipients at the dosages and concentrations employed and is compatible with other ingredients of the formulation For example, the formulation preferably does not include oxidizing agents and other compounds that are known to be deleterious to polypeptides Generally, the formulations are prepared by contacting a huXAG-l, huXAG-2 or huXAG-3 polypeptide uniformly and intimately with liquid carriers or finely divided solid carriers or both Then, if necessary, the product is shaped into the desired formulation Preferably the carrier is a parenteral carrier, more preferably a solution that is isotonic with the blood of the recipient Examples of such carrier vehicles include water, saline, Ringer's solution, and dextrose solution Non-aqueous vehicles such as fixed oils and ethyl oleate are also useful herein, as well as liposomes The carrier suitably contains minor amounts of additives such as substances that enhance isotonicity and chemical stability Such materials are non-toxic to recipients at the dosages and concentrations employed, and include buffers such as phosphate, citrate, succinate, acetic acid, and other organic acids or their salts, antioxidants such as ascorbic acid, low molecular weight (less than about ten residues) polypeptides, e.g., polyarginine or tripeptides; proteins, such as serum albumin, gelatin, or immunoglobulins, hydrophilic polymers such as polyvinylpyrrolidone, amino acids, such as giycine, glutamic acid, aspartic acid, or arginine; monosaccharides, disaccharides, and other carbohydrates including cellulose or its derivatives, glucose, mannose, or dextrins, chelating agents such as EDTA, sugar alcohols such as mannitol or sorbitol, counterions such as sodium; and/or nonionic surfactants such as polysorbates, poloxamers, or PEG A huXAG-l, huXAG-2 or huXAG-3 polypeptide is typically formulated in such vehicles at a concentration of about 0 1 mg ml to 100 mg/ml, preferably 1-10 mg/ml, at a pH of about 3 to 8 It will be understood that the use of certain of the foregoing excipients, carriers, or stabilizers will result in the formation of huXAG-l, huXAG-2 or huXAG-3 polypeptide salts A huXAG- l, huXAG-2 or huXAG-3 polypeptide to be used for therapeutic administration must be sterile Sterility is readily accomplished by filtration through sterile filtration membranes (e.g., 0 2 micron membranes). Therapeutic huXAG-l , huXAG-2 or huXAG-3 polypeptide compositions generally are placed into a container having a sterile access port, for example, an intravenous solution bag or vial having a stopper pierceable by a hypodermic injection needle. A huXAG-l, huXAG-2 or huXAG-3 polypeptide ordinarily will be stored in unit or multi-dose containers, for example, sealed ampules or vials, as an aqueous solution or as a lyophilized formulation for reconstitution. As an example of a lyophilized formulation, 10-ml vials are filled with 5 ml of sterile-filtered 1% (w/v) aqueous huXAG-l, huXAG-2 or huXAG-3 polypeptide solution, and the resulting mixture is lyophilized The infusion solution is prepared by reconstituting the lyophilized huXAG-l, huXAG-2 or huXAG-3 polypeptide using bacteriostatic Water-for-Injection The invention also provides a pharmaceutical pack or kit comprising one or more containers filled with one or more of the ingredients of the pharmaceutical compositions of the invention. Associated with such container(s) can be a notice in the form prescribed by a governmental agency regulating the manufacture, use or sale of pharmaceuticals or biological products, which notice reflects approval by the agency of manufacture, use or sale for human administration. In addition, the polypeptides of the present invention may be employed in conjunction with other therapeutic compounds. Chromosome Assays The nucleic acid molecules of the present invention are also valuable for chromosome identification. The sequence is specifically targeted to and can hybridize with a particular location on an individual human chromosome Moreover, there is a current need for identifying particular sites on the chromosome. Few chromosome marking reagents based on actual sequence data (repeat polymorphisms) are presently available for marking chromosomal location The mapping of DNAs to chromosomes according to the present invention is an important first step in correlating those sequences with genes associated with disease. In certain preferred embodiments in this regard, the cDNA herein disclosed is used to clone genomic DNA of a huXAG-l, huXAG-2 or huXAG-3 protein gene. This can be accomplished using a variety of well known techniques and libraries, which generally are available commercially. The genomic DNA then is used for in situ chromosome mapping using well known techniques for this purpose Typically, in accordance with routine procedures for chromosome mapping, some trial and error may be necessary to identify a genomic probe that gives a good in situ hybridization signal. In addition, in some cases, sequences can be mapped to chromosomes by preparing PCR primers (preferably 15-25 bp) from the cDNA. Computer analysis of the 3' untranslated region of the gene is used to rapidly select primers that do not span more than one exon in the genomic DNA, thus complicating the amplification process. These primers are then used for PCR screening of somatic cell hybrids containing individual human chromosomes Only those hybrids containing the human gene corresponding to the primer will yield an amplified portion. PCR mapping of somatic cell hybrids is a rapid procedure for assigning a particular DNA to a particular chromosome. Using the present invention with the same oligonucleotide primers, sublocalization can be achieved with panels of portions from specific chromosomes or pools of large genomic clones in an analogous manner. Other mapping strategies that can similarly be used to map to its chromosome include in situ hybridization, prescreening with labeled flow- sorted chromosomes and preselection by hybridization to construct chromosome specific-cDNA libraries. Fluorescence in situ hybridization ("FISH") of a cDNA clone to a metaphase chromosomal spread can be used to provide a precise chromosomal location in one step. This technique can be used with probes from the cDNA as short as 50 or 60 bp For a review of this technique, see Verma et al, Human Chromosomes: A Manual Of Basic Techniques, Pergamon Press, New York (1988) Once a sequence has been mapped to a precise chromosomal location, the physical position of the sequence on the chromosome can be correlated with genetic map data Such data are found, for example, in V McKusick, Mende an Inheritance In Man, available on-line through Johns Hopkins University, Welch Medical Library The relationship between genes and diseases that have been mapped to the same chromosomal region are then identified through linkage analysis (coinheritance of physically adjacent genes) Next, it is necessary to determine the differences in the cDNA or genomic sequence between affected and unaffected individuals If a mutation is observed in some or all of the affected individuals but not in any normal individuals, then the mutation is likely to be the causative agent of the disease With current resolution of physical mapping and genetic mapping techniques, a cDNA precisely localized to a chromosomal region associated with the disease could be one of between 50 and 500 potential causative genes This assumes 1 megabase mapping resolution and one gene per 20 kb Having generally described the invention, the same will be more readily understood by reference to the following examples, which are provided by way of illustration and are not intended as limiting Example 1: Expression and Purification ofhuXAG-1 Polypeptide in E. coli The DNA sequence encoding the mature huXAG-l in the deposited cDNA clone was amplified using PCR oligonucleotide primers specific to the amino terminal sequences of the huXAG-l and to vector sequences 3' to the gene Additional nucleotides containing restriction sites to facilitate cloning were added to the 5' and 3' sequences respectively The 5' oligonucleotide primer had the sequence 5' CGC CCA TGG GCC AGA GAT ACC ACA G 3' (SEQ ID NO.23) containing the underlined Ncol restriction site The 3' primer had the sequence 5' CGC AAG CTT TTA CAA TTC AGT CTT CAG C 3' (SEQ LD NO:24) containing the underlined Hindlll restriction site Alternatively, the following primers can be used 5' primer 5' GACCGC TCATGA GAG ATA CCA CAG TCA AAC CTG GAG CCA AAA AG 3' (SEQ ID NO: 42) 3* primer 5' GACCGC AAGCTT GAA GGG CTT GGA GAT TTT TTT TTA TTA CAA TTC 3' (SEQ ID NO 43) The restriction sites are convenient to restriction enzyme sites in the bacterial expression vector pQE60, which was used for bacterial expression in M15/rep4 host cells in these examples (Qiagen, Inc , Chatsworth, CA, 9131 1) pQE60 encodes ampicillin antibiotic resistance ("Amp r ") and contains a bacterial origin of replication ("ori"), an IPTG inducible promoter, a ribosome binding site ("RBS"), a 6-His tag and restriction enzyme sites The amplified huXAG- 1 DNA and the vector pQE60 both were digested with Ncol and Hindlll and the digested DNAs were then ligated together Insertion of the huXAG- 1 DNA into the restricted pQE60 vector placed the huXAG-l coding region downstream of and operably linked to the vector's IPTG-inducible promoter and in-frame with an initiating ATG appropriately positioned for translation of huXAG-l. The ligation mixture was transformed into competent E. coli cells using standard procedures. Such procedures are described in Sambrook et al, Molecular Cloning: A Laboratory Manual, 2nd Ed , Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N Y (1989) E. coli strain M15/rep4, containing multiple copies of the plasmid pREP4, which expresses lac repressor and confers kanamycin resistance ("Kan"'), was used in carrying out the illustrative example described here This strain, which is only one of many that are suitable for expressing huXAG-l, is available commercially from Qiagen Transformants were identified by their ability to grow on LB plates in the presence of ampicillin and kanamycin. Plasmid DNA was isolated from resistant colonies and the identity of the cloned DNA was confirmed by restriction analysis Clones containing the desired constructs were grown overnight CO/NT) in liquid culture in LB media supplemented with both ampicillin (100 μg/ml) and kanamycin (25 μg/ml). The O/N culture was used to inoculate a large culture, at a dilution of approximately 1 100 to 1.250 The cells were grown to an optical density at 600nm ("OD600") of between 0 4 and 0 6 Isopropyl-B-D-thiogalactopyranoside ("EPTG") was then added to a final concentration of 1 M to induce transcription from lac repressor sensitive promoters, by inactivating the lac\ repressor Cells subsequently were incubated further for 3 to 4 hours Cells were then harvested by centrifugation and disrupted, by standard methods Inclusion bodies were purified from the disrupted cells using routine collection techniques, and protein was solubilized from the inclusion bodies into 8M urea The 8M urea solution containing the solubilized protein was passed over a PD-10 column in 50 mM Tris (pH 7 0) + 400 or 200 mM NaCl, thereby removing the urea, exchanging the buffer and refolding the protein The protein was purified by a further step of chromatography to remove endotoxin Then, it was sterile filtered The sterile filtered protein preparation was stored in the above Tris buffer Analysis of the preparation by standard methods of polyacrylamide gel electrophoresis revealed that the preparation contains about 90% monomer huXAG- 1 having the expected molecular weight of approximately 16 kDa Example 2: Expression and Purification ofhuXAG-2 Polypeptide in E. coli The DNA sequence encoding the mature huXAG-2 in the deposited cDNA clone was amplified using PCR oligonucleotide primers specific to the amino terminal sequences of the huXAG-2 and to vector sequences 3' to the gene Additional nucleotides containing restriction sites to facilitate cloning were added to the 5' and 3' sequences respectively. The 5' oligonucleotide primer had the sequence 5' GAC CGC ACATGT TCT GAT GGA CAT AAT GGG CTT GGA AAG GGT TTT G 3' (SEQ ID NO 25) containing the underlined Afllll restriction site The 3' primer had the sequence 5' GAC CGC AAGCTT CTC TGA TGA AAG AAG GGG CAC ATT CTT ATT ACA ATT C 3' (SEQ ID NO 26) containing the underlined Hindlll restriction site The restriction sites are convenient to restriction enzyme sites in the bacterial expression vector pQE60, which was used for bacterial expression in M15/rep4 host cells in these examples (Qiagen, Inc , Chatsworth, CA, 9131 1) pQE60 encodes ampicillin antibiotic resistance ("Amp r ") and contains a bacterial origin of replication ("ori"), an EPTG inducible promoter, a ribosome binding site ("RBS"), a 6-His tag and restriction enzyme sites The amplified huXAG-2 DNA and the vector pQE60 both were digested with Afllll and Hindlll and the digested DNAs were then ligated together Insertion of the huXAG-2 DNA into the restricted pQE60 vector placed the huXAG-2 coding region downstream of and operably linked to the vector's IPTG-inducible promoter and in-frame with an initiating ATG appropriately positioned for translation of huXAG-2. Transformation oϊE. coli, expression and purification of huXAG-2 were carried out according to the procedures set forth in Example 1 Example 3: Expression and Purification ofhuXAG-3 Polypeptide in E. coli The DNA sequence encoding the mature huXAG-3 in the deposited cDNA clone was amplified using PCR oligonucleotide primers specific to the amino terminal sequences of the huXAG-3 and to vector sequences 3' to the gene Additional nucleotides containing restriction sites to facilitate cloning were added to the 5' and 3' sequences respectively The 5' oligonucleotide primer had the sequence 5' GAC CGC TCATGA ATA AAA AAG GAA AAG AGG CCT CCT CAG ACA CTC 3' (SEQ ID NO 27) containing the underlined BspHI restriction site The 3' primer had the sequence 5' GAC CGC AAGCTT CTT TGA AGT GAA GGC TTT TTT CTA TCA TTT ATT ATA G 3' (SEQ ID NO 28) containing the underlined Hindlll restriction site The restriction sites are convenient to restriction enzyme sites in the bacterial expression vector pQE60, which was used for bacterial expression in M 15/rep4 host cells in these examples (Qiagen, Inc , Chatsworth, C A, 91311 ) pQE60 encodes ampicillin antibiotic resistance ("Amp r ") and contains a bacterial origin of replication ("ori"), an IPTG inducible promoter, a ribosome binding site ("RBS"), a 6-His tag and restriction enzyme sites The amplified huXAG-3 DNA and the vector pQE60 both were digested with BspHI and Hindlll and the digested DNAs were then ligated together Insertion of the huXAG-3 DNA into the restricted pQE60 vector placed the huXAG-3 coding region downstream of and operably linked to the vector's IPTG-inducible promoter and in-frame with an initiating ATG appropriately positioned for translation of huXAG-3 Transformation of£. coli, expression and purification of huXAG-3 were carried out according to the procedures set forth in Example 1 Example 4: Goning and Expression ofhuXAG-1 in a Baculovirus Expression System The cDNA sequence encoding the full length huXAG- 1 in the deposited clone is amplified using PCR oligonucleotide primers corresponding to the 5 ' and 3 ' sequences of the gene The 5' primer has the sequence 5' CGC GGA TCC GCC ATC ATG GAG AAA ATT CCA GTG 3' (SEQ ED NO.29) containing the underlined BamHI restriction enzyme site followed by eighteen bases of the sequence of huXAG-l in Figure 1 Inserted into an expression vector, as described below, the 5 ' end of the amplified fragment encoding huXAG-l provides an efficient signal peptide An efficient signal for initiation of translation in eukaryotic cells, as described by Kozak, M , J. Mol Biol 196 947-950 (1987) is appropriately located in the vector portion of the construct The 3 ' primer has the sequence 5 ' CGC GGA TCC TTA CAA TTC AGT CTT CAG C 3 ' (SEQ ID NO 30) containing the underlined BamHI restriction site followed by nucleotides complementary to the last nineteen nucleotides of the huXAG-l coding sequence set out in Figure 1 Alternatively, the following primers may be used 5' primer 5' GACT GGATCC GCCATC ATG GAG AAA ATT CCA GTG TCA GCA TTC TTG CTC 3' (SEQ ID NO 44) 3' primer 5' GACT GGTACC GGA GAT TTT TTT TCT TTA CAA TTC AGT CTT CAG 3' (SEQ LD NO 45) The amplified fragment is isolated from a 1% agarose gel using a commercially available kit ("Geneclean," BIO 101 Inc , La Jolla, Ca ) The fragment then is digested with BamHI and again is purified on a 1% agarose gel This fragment is designated herein F2 The vector pA2-GP is used to express huXAG-l in the baculovirus expression system, using standard methods, as described in Summers et al, A Manual of Methods for Baculovirus Vectors and Insect Cell Culture Procedures, Texas Agricultural Experimental Station Bulletin No 1555 (1987) This expression vector contains the strong polyhedrin promoter of the Autographa californica nuclear polyhedrosis virus (AcMNPV) followed by convenient restriction sites The signal peptide of AcMNPV gp67, including the N-terminal methionine, is located just upstream of a BamHI site The polyadenylation site of the simian virus 40 ("SV40") is used for efficient polyadenylation For an easy selection of recombinant virus the beta-galactosidase gene from E. coli is inserted in the same orientation as the polyhedrin promoter and is followed by the polyadenylation signal of the polyhedrin gene The polyhedrin sequences are flanked at both sides by viral sequences for cell-mediated homologous recombination with wild-type viral DNA to generate viable virus that express the cloned polynucleotide Many other baculovirus vectors could be used in place of pA2-GP, such as pAc373, pVL941 and pAcIMl provided, as those of skill readily will appreciate, that construction provides appropriately located signals for transcription, translation, trafficking and the like, such as an in-frame AUG and a signal peptide, as required Such vectors are described in Luckow et al , Virology 170 31-39, among others The plasmid is digested with the restriction enzyme BamHI and then is dephosphorylated using calf intestinal phosphatase, using routine procedures known in the art The DNA is then isolated from a 1% agarose gel using a commercially available kit ("Geneclean" BIO 101 Inc , La Jolla, Ca ) This vector DNA is designated herein "V" Fragment F2 and the dephosphorylated plasmid V2 are ligated together with T4 DNA ligase E. coli HB101 cells are transformed with ligation mix and spread on culture plates Bacteria are identified that contain the plasmid with the huXAG-l gene by digesting DNA from individual colonies using Xbal and then analyzing the digestion product by gel electrophoresis The sequence of the cloned fragment is confirmed by DNA sequencing This plasmid is designated herein pBac huXAG-1 5 μg of the plasmid pBac huXAG-l is co-transfected with 1.0 μg of a commercially available linearized baculovirus DNA ("BaculoGold™ baculovirus DNA", Pharmingen, San Diego, CA ), using the lipofection method described by Feigner et al , Proc. Natl. Acad. Sci. USA 84 7413-7417 (1987) l μg of BaculoGold™ virus DNA and 5 μg of the plasmid pBac huXAG-l are mixed in a sterile well of a microtiter plate containing 50 μl of serum-free Grace's medium (Life Technologies Inc , Gaithersburg, MD) Afterwards 10 μl Lipofectin plus 90 μl Grace's medium are added, mixed and incubated for 15 minutes at room temperature Then the transfection mixture is added drop-wise to Sf9 insect cells (ATCC CRL 171 1) seeded in a 35 mm tissue culture plate with 1 ml Grace's medium without serum The plate is rocked back and forth to mix the newly added solution The plate is then incubated for 5 hours at 27°C After 5 hours the transfection solution is removed from the plate and 1 ml of Grace's insect medium supplemented with 10% fetal calf serum is added The plate is put back into an incubator and cultivation is continued at 27°C for four days After four days the supernatant is collected and a plaque assay is performed, as described by Summers and Smith, cited above An agarose gel with "Blue Gal" (Life Technologies Inc., Gaithersburg) is used to allow easy identification and isolation of gal-expressing clones, which produce blue-stained plaques (A detailed description of a "plaque assay" of this type can also be found in the user's guide for insect cell culture and baculovirology distributed by Life Technologies Inc., Gaithersburg, page 9-10) Four days after serial dilution, the virus is added to the cells After appropriate incubation, blue stained plaques are picked with the tip of an Eppendorf pipette The agar containing the recombinant viruses is then resuspended in an Eppendorf tube containing 200 μi of Grace's medium The agar is removed by a brief centrifugation and the supernatant containing the recombinant baculovirus is used to infect Sf9 cells seeded in 35 mm dishes Four days later the supernatants of these culture dishes are harvested and then they are stored at 4°C A clone containing properly inserted hESSB I, II and III is identified by DNA analysis including restriction mapping and sequencing This is designated herein as V- huXAG- 1 Sf9 cells are grown in Grace's medium supplemented with 10% heat-inactivated FBS. The cells are infected with the recombinant baculovirus V- huXAG-l at a multiplicity of infection ("MOI") of about 2 (about 1 to about 3). Six hours later the medium is removed and is replaced with SF900 II medium minus methionine and cysteine (available from Life Technologies Inc., Gaithersburg). 42 hours later, 5 μCi of 35 S-methionine and 5 μCi 35 S-cysteine (available from Amersham) are added The cells are further incubated for 16 hours and then they are harvested by centrifligation, lysed and the labeled proteins are visualized by SDS-PAGE and autoradiography Example 5: Cloning and Expression of huXAG-2 protein in a Baculovirus Expression System In this illustrative example, the plasmid shuttle vector pA2 is used to insert the cloned DNA encoding the complete protein, including its naturally associated secretary signal (leader) sequence, into a baculovirus to express the mature huXAG-2 protein, using standard methods as described in Summers et al, A Manual of Methods for Baculovirus Vectors and Insect Cell Culture Procedures, Texas Agricultural Experimental Station Bulletin No 1555 (1987) This expression vector contains the strong polyhedrin promoter of the Autographa californica nuclear polyhedrosis virus (AcMNPV) followed by convenient restriction sites such as BamHI and Asp718 The polyadenylation site of the simian virus 40 ("SV40") is used for efficient polyadenylation For easy selection of recombinant virus, the plasmid contains the beta-galactosidase gene from E. coli under control of a weak Drosophila promoter in the same orientation, followed by the polyadenylation signal of the polyhedrin gene. The inserted genes are flanked on both sides by viral sequences for cell-mediated homologous recombination with wild-type viral DNA to generate viable virus that express the cloned polynucleotide Many other baculovirus vectors could be used in place of the vector above, such as pAc373, ρVL941 and pAcIMl, as one skilled in the art would readily appreciate, as long as the construct provides appropriately located signals for transcription, translation, secretion and the like, including a signal peptide and an in-frame AUG as required Such vectors are described, for instance, in Luckow et al, Virology 170.31-39. The cDNA sequence encoding the full length huXAG-2 protein in the deposited clone, including the AUG initiation codon and the naturally associated leader sequence shown in Figure 2 (SEQ ID NO 4), is amplified using PCR oligonucleotide primers corresponding to the 5' and 3' sequences of the gene The 5' primer has the sequence 5' GACT TGATCA GCC ATC ATG GAG ACG CGG CCT CGT CTC GGG GCC ACC TG 3' (SEQ ID NO.31 ) containing the underlined Bell restriction enzyme site, an efficient signal for initiation of translation in eukaryotic cells, as described by Kozak, M., J. Mol. Biol 196:941-950 (1987), followed by 32 bases of the sequence of the complete huXAG-2 protein shown in Figure 2, beginning with the AUG initiation codon The 3' primer has the sequence 5' GACT GGTACC GAA GGG GCA CAT TCA TGT TAC AAT TCA TCT TCA AG 3' (SEQ ID NO 32) containing the underlined, Asp718I restriction site followed by 35 nucleotides complementary to the 3' sequence in Figure 2. The amplified fragment is isolated from a 1% agarose gel using a commercially available kit ("Geneclean," BIO 101 Inc., La olla, Ca ) The fragment then is digested with Bell and Asp7181 and again is purified on a 1% agarose gel. This fragment is designated herein "FI " The plasmid is digested with the restriction enzymes Bell and Asp7181 and optionally, can be dephosphorylated using calf intestinal phosphatase, using routine procedures known in the art The DNA is then isolated from a 1% agarose gel using a commercially available kit ("Geneclean" BIO 101 Inc , La Jolla, Ca ) This vector DNA is designated herein "VI " Fragment FI and the dephosphorylated plasmid VI are ligated together with T4 DNA ligase. E. coli HB 101 or other suitable E. coli hosts such as XL-1 Blue (Stratagene Cloning Systems, La Jolla, CA) cells are transformed with the ligation mixture and spread on culture plates Bacteria are identified that contain the plasmid with the huXAG-2 gene using the PCR method, in which one of the primers that is used to amplify the gene and the second primer is from well within the vector so that only those bacterial colonies containing the huXAG-2 gene fragment will show amplification of the DNA The sequence of the cloned fragment is confirmed by DNA sequencing This plasmid is designated herein pBachuXAG-2 Five μg of the plasmid pBachuXAG-2 is co-transfected with 1 0 μg of a commercially available linearized baculovirus DNA ("BaculoGold™ baculovirus DNA", Pharmingen, San Diego, CA ), using the lipofection method described by Feigner et al, Proc. Natl. Acad. Sci. USA 84 7413-7417 (1987) 1 μg of BaculoGold™ virus DNA and 5 μg of the plasmid pBachuXAG-2 are mixed in a sterile well of a microtiter plate containing 50 μl of serum-free Grace's medium (Life Technologies Inc., Gaithersburg, MD) Afterwards, 10 μl Lipofectin plus 90 μl Grace's medium are added, mixed and incubated for 15 minutes at room temperature Then the transfection mixture is added drop-wise to Sf9 insect cells (ATCC CRL 171 1) seeded in a 35 mm tissue culture plate with 1 ml Grace's medium without serum The plate is rocked back and forth to mix the newly added solution The plate is then incubated for 5 hours at 27 °C After 5 hours the transfection solution is removed from the plate and 1 ml of Grace's insect medium supplemented with 10% fetal calf serum is added The plate is put back into an incubator and cultivation is continued at 27°C for four days After four days the supernatant is collected and a plaque assay is performed, as described by Summers and Smith, supra. An agarose gel with "Blue Gal" (Life Technologies Inc , Gaithersburg) is used to allow easy identification and isolation of gal-expressing clones, which produce blue-stained plaques (A detailed description of a "plaque assay" of this type can also be found in the user's guide for insect cell culture and baculovirology distributed by Life Technologies Inc , Gaithersburg, page 9-10) After appropriate incubation, blue stained plaques are picked with the tip of a micropipettor (e g , Eppendorf) The agar containing the recombinant viruses is then resuspended in a microcentrifuge tube containing 200 μl of Grace's medium and the suspension containing the recombinant baculovirus is used to infect Sf9 cells seeded in 35 mm dishes Four days later the supernatants of these culture dishes are harvested and then they are stored at 4°C The recombinant virus is called V-huXAG-2 To verify the expression of the huXAG-2 gene, Sf9 cells are grown in Grace's medium supplemented with 10% heat inactivated FBS The cells are infected with the recombinant baculovirus V-huXAG-2 at a multiplicity of infection ("MOI") of about 2 Six hours later the medium is removed and is replaced with SF900 II medium minus methionine and cysteine (available from Life Technologies Inc , Rockville, MD) If radiolabeled proteins are desired, 42 hours later, 5 μCi of 35 S-methionine and 5 μCi (available from Amersham) are added The cells are further incubated for 16 hours and then they are harvested by centrifugation The proteins in the supernatant as well as the intracellular proteins are analyzed by SDS-PAGE followed by autoradiography (if radiolabeled) Microsequencing of the amino acid sequence of the amino terminus of purified protein may be used to determine the amino terminal sequence of the mature protein and thus the cleavage point and length of the secretory signal peptide Example 6: Cloning and Expression of huXAG-3 protein in a Baculovirus Expression System In this illustrative example, the plasmid shuttle vector pA2 is used to insert the cloned DNA encoding the complete protein, including its naturally associated secretary signal (leader) sequence, into a baculovirus to express the mature huXAG-3 protein, using standard methods as described in Summers et al, A Manual of Methods for Baculovirus Vectors and Insect Cell Culture Procedures, Texas Agricultural Experimental Station Bulletin No 1555 (1987). Many other baculovirus vectors could be used in place of the vector above, such as pAc373, pVL941 and pAcIMl , as one skilled in the art would readily appreciate, as long as the construct provides appropriately located signals for transcription, translation, secretion and the like, including a signal peptide and an in-frame AUG as required Such vectors are described, for instance, in Luckow et al, Virology 170 31-39 The cDNA sequence encoding the full length huXAG-3 protein in the deposited clone, including the AUG initiation codon and the naturally associated leader sequence shown in Figure 3 (SEQ ID NO 6), is amplified using PCR oligonucleotide primers corresponding to the 5' and 3 ' sequences of the gene The 5' primer has the sequence 5' GACT GGATCC GCC ATC ATG ATG CTA C AC TCA GCT TTG GGT CTC TGC CTC 3' (SEQ ID NO 33) containing the underlined BamHI restriction enzyme site, an efficient signal for initiation of translation in eukaryotic cells, as described by Kozak, M , J. Mol Biol 196 941-950 (1987), followed by 33 bases of the sequence of the complete huXAG-3 protein shown in Figure 3, beginning with the AUG initiation codon The 3' primer has the sequence 5' GACT GGTACC GAA GGC TTT TTT CTA TCA TCT CTT ATA GCT CCT CAT ATG 3' (SEQ ID NO 34) containing the underlined, Asp718I restriction site followed by 3 1 nucleotides complementary to the 3' sequence in Figure 3 The amplified fragment is isolated from a 1% agarose gel using a commercially available kit ("Geneclean," BIO 101 Inc , La Jolla, Ca ) The fragment then is digested with BamHI and Asp718I and again is purified on a 1% agarose gel This fragment is designated herein "FI " The plasmid is digested with the restriction enzymes BamHI and Asp718I and optionally, can be dephosphorylated using calf intestinal phosphatase, using routine procedures known in the art The DNA is then isolated from a 1% agarose gel using a commercially available kit ("Geneclean" BIO 101 Inc , La Jolla, Ca ) This vector DNA is designated herein "VI " Formation of recombinant virus and expression and purification of huXAG-3 is carried out according to the procedures described in Example 5 Example 7: Goning and Expression of huXAG-l , huXAG-2 and huXAG-3 in Mammalian Cells Most of the vectors used for the transient expression of the huXAG- 1 , huXAG-2 or huXAG-3 gene sequences in mammalian cells should carry the SV40 origin of replication This allows the replication of the vector to high copy numbers in cells (e g , COS cells) which express the T antigen required for the initiation of viral DNA synthesis Any other mammalian cell line can also be utilized for this purpose A typical mammalian expression vector contains the promoter element, which mediates the initiation of transcription of mRNA, the protein coding sequence, and signals required for the termination of trancription and polyadenylation of the transcript Additional elements include enhancers, Kozak sequences and intervening sequences flanked by donor and acceptor sites for RNA splicing Highly efficient transcription can be achieved with the early and late promoters from SV40, the long terminal repeats (LTRs) from Retroviruses, e g , RSV, HTLVI, HLVl and the early promoter of the cytomegalovirus (CMV) However, cellular signals can also be used (e g , human actin promoter) Suitable expression vectors for use in practicing the present invention include, for example, vectors such as pSVL and pMSG (Pharmacia, Uppsala, Sweden), pRSVcat (ATCC 37152), pSV2dhfr (ATCC 37146) and pBC12MI (ATCC 67109) Mammalian host cells that could be used include, human Hela, 283, H9 and Jurkat cells, mouse NLH3T3 and C127 cells, Cos 1, Cos 7 and CV1, African green monkey cells, quail QC1-3 cells, mouse L cells and Chinese hamster ovary cells Alternatively, the gene can be expressed in stable cell lines that contain the gene integrated into a chromosome. The co-transfection with a selectable marker such as dhfr, gpt, neomycin, hygromycin allows the identification and isolation of the transfected cells The transfected gene can also be amplified to express large amounts of the encoded protein The DHFR (dihydrofolate reductase) is a useful marker to develop cell lines that carry several hundred or even several thousand copies of the gene of interest Another useful selection marker is the enzyme glutamine synthase (GS) (Murphy et al, Biochem J. 227:277-279 (1991), Bebbington et al, Bio/Technology 10: 169- 175 ( 1992)) Using these markers, the mammalian cells are grown in selective medium and the cells with the highest resistance are selected These cell lines contain the amplified gene(s) integrated into a chromosome Chinese hamster ovary (CHO) cells are often used for the production of proteins The expression vectors pC 1 and pC4 contain the strong promoter (LTR) of the Rous Sarcoma Virus (Cullen et al, Molecular and Cellular Biology, 438-447 (March, 1985)) plus a fragment of the CMV-enhancer (Boshart et al, Cell 41 521-530 (1985)) Multiple cloning sites, e g , with the restriction enzyme cleavage sites BamHI, Xbal and Asp718, facilitate the cloning of the gene of interest The vectors contain in addition the 3 ' intron, the polyadenylation and termination signal of the rat preproinsulin gene Example 7(a): Cloning and Expression ofhuXAG-1 in COS Cells The expression plasmid, phuXAG-1 HA, is made by cloning a cDNA encoding huXAG-l into the expression vector pcDNAJ/Amp or pcDNAIII (which can be obtained from lnvitrogen, Inc ) The expression vector pcDNAL/amp contains (1) an E. coli origin of replication effective for propagation in E. coli and other prokaryotic cells; (2) an ampicillin resistance gene for selection of plasmid-containing prokaryotic cells, (3) an SV40 origin of replication for propagation in eukaryotic cells, (4) a CMV promoter, a polylinker, an SV40 intron, (5) several codons encoding a hemagglutinin fragment (i e , an "HA" tag to facilitate purification) followed by a termination codon and polyadenylation signal arranged so that a cDNA can be conveniently placed under expression control of the CMV promoter and operably linked to the SV40 intron and the polyadenylation signal by means of restriction sites in the polylinker The HA tag corresponds to an epitope derived from the influenza hemagglutinin protein described by Wilson et al, Cell 37:161-118 (1984) The fusion of the HA tag to the target protein allows easy detection and recovery of the recombinant protein with an antibody that recognizes the HA epitope pcDNAIII contains, in addition, the selectable neomycin marker A DNA fragment encoding huXAG-l is cloned into the polylinker region of the vector so that recombinant protein expression is directed by the CMV promoter The plasmid construction strategy is as follows The huXAG-l cDNA of the deposited clone is amplified using primers that contain convenient restriction sites, much as described above for construction of vectors for expression of huXAG-l in E. coll. Suitable primers include the following, which are used in this example The 5' primer, containing the underlined BamHI site, a Kozak sequence, an AUG start codon and 18 bp of the 5' coding region of the complete huXAG-l has the following sequence 5' CGC GGA TCC GCC ATC ATG GAG AAA ATT CCA GTG 3' (SEQ ID NO.29) The 3 * primer, containing the underlined BamHI site, a stop codon, and 19 bp of 3' coding sequence has the following sequence (at the 3* end) 5' CGC GGA TCC TTA CAA TTC AGT CTT CAG C 3' (SEQ ID NO:30) Alternatively, the following primers may be used 5' primer 5' GACT GGATCC GCCATC ATG GAG AAA ATT CCA GTG TCA GCA TTC TTG CTC 3' (SEQ ID NO 44) 3' primer: 5' GACT GGTACC GGA GAT TTT TTT TCT TTA CAA TTC AGT CTT CAG 3' (SEQ LD NO:45) The PCR amplified DNA fragment and the vector, pcDNAI/Amp, are digested with BamHI and then ligated. The ligation mixture is transformed into E. coli strain SURE (available from Stratagene Cloning Systems, 1 1099 North Torrey Pines Road, La Jolla, CA 92037), and the transformed culture is plated on ampicillin media plates which then are incubated to allow growth of ampicillin resistant colonies Plasmid DNA is isolated from resistant colonies and examined by restriction analysis or other means for the presence of the huXAG- 1 -encoding fragment For expression of recombinant huXAG-l , COS cells are transfected with an expression vector, as described above, using DEAE-DEXTRAN, as described, for instance, in Sambrook et al, Molecular Cloning: a Laboratory Manual, Cold Spring Laboratory Press, Cold Spring Harbor, New York (1989) Cells are incubated under conditions for expression of huXAG-l by the vector Expression of the huXAG-1-HA fusion protein is detected by radiolabeling and immunoprecipitation, using methods described in, for example Harlow et al, Antibodies: A Laboratory Manual, 2nd Ed. ; Cold Spring Harbor Laboratory Press, Cold Spring Harbor, New York (1988) To this end, two days after transfection, the cells are labeled by incubation in media containing 3S S-cysteine for 8 hours The cells and the media are collected, and the cells are washed and lysed with detergent-containing RIPA buffer. 150 mM NaCI, 1% NP-40, 0 1% SDS, 0.5% DOC, 50 mM TRIS, pH 7 5, as described by Wilson et al. cited above. Proteins are precipitated from the cell lysate and from the culture media using an HA-specific monoclonal antibody The precipitated proteins then are analyzed by SDS-PAGE and autoradiography An expression product of the expected size is seen in the cell lysate, which is not seen in negative controls Example 7(b): Cloning and Expression ofhuXAG-2 in COS Cells The expression plasmid, phuXAG-2 HA, is made by cloning a cDNA encoding huXAG-2 into the expression vector pcDNAI Amp or pcDNAIII (which can be obtained from Invitrogen, Inc ) A DNA fragment encoding huXAG-2 is cloned into the polylinker region of the vector so that recombinant protein expression is directed by the CMV promoter The plasmid construction strategy is as follows The 5' primer, containing the underlined site, a Kozak sequence, an AUG start codon and 32 bp of the 5' coding region of the complete huXAG-2 has the following sequence 5' GACT TGATCA GCC ATC ATG GAG ACG CGG CCT CGT CTC GGG GCC ACC TG 3' (SEQ ID NO.31 ) The 3' primer, containing the underlined Asp7181 site, a stop codon, and 35 bp of 3' coding sequence has the following sequence (at the 3' end) 5' GACT GGTACC GAA GGG GCA CAT TCA TGT TAC AAT TCA TCT TCA AG 3 * (SEQ ID NO.32) The PCR amplified DNA fragment and the vector, pcDNAI/Amp, are digested with BamHI and Asp718I and then ligated The ligation mixture is transformed into E. coli strain SURE (Stratagene Cloning Systems), and the - transformed culture is plated on ampicillin media plates which then are incubated to allow growth of ampicillin resistant colonies Plasmid DNA is isolated from resistant colonies and examined by restriction analysis or other means for the presence of the huXAG-2-encoding fragment For expression of recombinant huXAG-2, COS cells are transfected with an expression vector, as described above Cells are incubated under conditions for expression of huXAG-2 by the vector Expression of the huXAG-2-HA fusion protein is detected by radiolabeling and immunoprecipitation, using methods described above To this end, two days after transfection, the cells are labeled by incubation in media containing 35 S-cysteine for 8 hours The cells and the media are collected, and the cells are washed and lysed with detergent-containing RIPA buffer 150 mM NaCl, 1% NP-40, 0.1% SDS, 0.5% DOC, 50 mM TRIS, pH 7 5 Proteins are precipitated from the cell lysate and from the culture media using an HA-specific monoclonal antibody The precipitated proteins then are analyzed by SDS-PAGE and autoradiography. An expression product of the expected size is seen in the cell lysate, which is not seen in negative controls Example 7(c): Cloning and Expression ofhuXAG-3 in COS Cells The expression plasmid, phuXAG-3 HA, is made by cloning a cDNA encoding huXAG-3 into the expression vector pcDNAI/Amp or pcDNAIII (which can be obtained from Invitrogen, Inc ) A DNA fragment encoding huXAG-3 is cloned into the polylinker region of the vector so that recombinant protein expression is directed by the CMV promoter. The plasmid construction strategy is as follows The 5' primer, containing the underlined BamHI site, a Kozak sequence, an AUG start codon and 33 bp of the 5' coding region of the complete huXAG-3 has the following sequence: 5' GACT GGATCC GCCATC ATG ATG CTA CAC TCA GCT TTG GGT CTC TGC CTC 3' (SEQ ID NO 33) The 3' primer, containing the underlined Asp718I site, a stop codon, and 31 bp of 3' coding sequence has the following sequence (at the 3' end) 5' GACT GGTACC GAA GGC TTT TTT CTA TCA TCT CTT ATA GCT CCT CAT ATG 3' (SEQ ID NO.34) The PCR amplified DNA fragment and the vector, pcDNAI/Amp, are digested with BamHI and Asp718I and then ligated The ligation mixture is transformed into E. coli strain SURE (Stratagene Cloning Systems), and the transformed culture is plated on ampicillin media plates which then are incubated to allow growth of ampicillin resistant colonies Plasmid DNA is isolated from resistant colonies and examined by restriction analysis or other means for the presence of the huXAG-3 -encoding fragment For expression of recombinant huXAG-3, COS cells are transfected with an expression vector, using DEAE-DEXTRAN. Ceils are incubated under conditions for expression of huXAG-3 by the vector. Expression of the huXAG-3-HA fusion protein is detected by radiolabeling and immunoprecipitation, using methods described above. To this end, two days after transfection, the cells are labeled by incubation in media containing 35 S-cysteine for 8 hours. The cells and the media are collected, and the cells are washed and lysed with detergent-containing RIPA buffer: 150 mM NaCl, 1% NP-40, 0.1% SDS, 0.5% DOC, 50 mM TRIS, pH 7.5. Proteins are precipitated from the cell lysate and from the culture media using an HA-specific monoclonal antibody The precipitated proteins then are analyzed by SDS-PAGE and autoradiography. An expression product of the expected size is seen in the cell lysate, which is not seen in negative controls. Example 7(d): Cloning and Expression of huXAG-l in CHO Cells The vector pC4 is used for the expression of huXAG- 1 protein. Plasmid pC4 is a derivative of the plasmid pSV2-dhfr (ATCC Accession No. 37146). The plasmid contains the mouse DHFR gene under control of the SV40 early promoter. Chinese hamster ovary- or other cells lacking dihydrofolate activity that are transfected with these plasmids can be selected by growing the cells in a selective medium (alpha minus MEM, Life Technologies) supplemented with the chemotherapeutic agent ethotrexate. The amplification of the DHFR genes in cells resistant to methotrexate (MTX) has been well documented (see, e.g., Alt, F. W., Kellems, R. M., Bertino, J. R„ and Schimke, R T., 1978, J Biol. Chem. 253: 1357-1370, Hamlin, J. L. and Ma, C. 1990, Biochem. et Biophys. A a, 7097:107-143, Page, M. J. and Sydenham, M.A. 1991 , Biotechnology 9:64-68). Cells grown in increasing concentrations of MTX develop resistance to the drug by overproducing the target enzyme, DHFR, as a result of amplification of the DHFR gene. If a second gene is linked to the DHFR gene, it is usually co-amplified and over-expressed. It is known in the art that this approach may be used to develop cell lines carrying more than 1,000 copies of the amplified gene(s) Subsequently, when the methotrexate is withdrawn, cell lines are obtained which contain the amplified gene integrated into one or more chromosome(s) of the host cell Plasmid pC4 contains for expressing the gene of interest the strong promoter of the long terminal repeat (LTR) of the Rous Sarcoma Virus (Cullen et al, Molec. Cell. Biol 5 438-447 (1985)) plus a fragment isolated from the enhancer of the immediate early gene of human cytomegalovirus (CMV) (Boshart et al, Cell 41 521-530 (1985)) Downstream of the promoter are BamHI, Xbal, and Asp718 restriction enzyme cleavage sites that allow integration of the genes Behind these cloning sites the plasmid contains the 3' intron and polyadenylation site of the rat preproinsulin gene Other high efficiency promoters can also be used for the expression, e g , the human β-actin promoter, the SV40 early or late promoters or the long terminal repeats from other retroviruses, e g , HIV and HTLVI Clontech's Tet-Off and Tet-On gene expression systems and similar systems can be used to express the huXAG- 1 in a regulated way in mammalian cells (Gossen, M , & Bujard, H 1992, Proc Nad Acad. Sci USA 89 5547-5551) For the polyadenylation of the mRNA other signals, e g , from the human growth hormone or globin genes can be used as well Stable cell lines carrying a gene of interest integrated into the chromosomes can also be selected upon co-transfection with a selectable marker such as gpt, G418 or hygromycin It is advantageous to use more than one selectable marker in the beginning, e g , G418 plus methotrexate The plasmid pC4 is digested with the restriction enzyme BamHI and then dephosphorylated using calf intestinal phosphatase by procedures known in the art The vector is then isolated from a 1% agarose gel The DNA sequence encoding the complete huXAG- 1 protein including its leader sequence is amplified using PCR oligonucleotide primers corresponding to the 5' and 3' sequences of the gene The 5' primer has the sequence 5' CGC GGA TCC GCC ATC ATG GAG AAA ATT CCA GTG 3' (SEQ ID NO:29) containing the underlined BamHI restriction enzyme site followed by an efficient signal for initiation of translation in eukaryotes, as described by Kozak, M., J. Mol Biol. 196:941-950 (1987), and 18 bases of the coding sequence of huXAG-l shown in Figure 1 (SEQ ID NO: 1). The 3' primer has the sequence 5' CGC GGA TCC TTA CAA TTC AGT CTT CAG C 3' (SEQ LD NO.30) containing the underlined BamHI restriction site followed by 19 nucleotides complementary to the non-translated region of the huXAG-l gene shown in Figure 1 (SEQ ID NOT). Alternatively, the following primers may be used 5' primer: 5' GACT GGATCC GCCATC ATG GAG AAA ATT CCA GTG TCA GCA TTC TTG CTC 3' (SEQ ID NO 44) 3' primer: 5' GACT GGTACC GGA GAT TTT TTT TCT TTA CAA TTC AGT CTT CAG 3' (SEQ LD NO:45) The amplified fragment is digested with the endonuclease BamHI and then purified again on a 1% agarose gel. The isolated fragment and the dephosphorylated vector are then ligated with T4 DNA ligase E. coli HBlOl or XL-1 Blue cells are then transformed and bacteria are identified that contain the fragment inserted into plasmid pC4 using, for instance, restriction enzyme analysis Chinese hamster ovary cells lacking an active DHFR gene are used for transfection. 5 μg of the expression plasmid pC4 is cotransfected with 0.5 μg of the plasmid pSV2-neo using lipofectin (Feigner et al, supra). The plasmid pSV2- neo contains a dominant selectable marker, the neo gene from Tn5 encoding an enzyme that confers resistance to a group of antibiotics including G418 The cells are seeded in alpha minus MEM supplemented with 1 mg/ml G418. After 2 days, the cells are trypsinized and seeded in hybridoma cloning plates (Greiner, Germany) in alpha minus MEM supplemented with 10, 25, or 50 ng/ml of metothrexate plus 1 mg/ml G418. After about 10-14 days single clones are trypsinized and then seeded in 6-well petri dishes or 10 ml flasks using different concentrations of methotrexate (50 nM, 100 nM, 200 nM, 400 nM, 800 nM). Clones growing at the highest concentrations of methotrexate are then transferred to new 6-weli plates containing even higher concentrations of methotrexate (1 μM, 2 μM, 5 μM, 10 μM, 20 μM) The same procedure is repeated until clones are obtained which grow at a concentration of 100 - 200 μM Expression of the desired gene product is analyzed, for instance, by SDS-PAGE and Western blot or by reverse phase HPLC analysis. Example 7(e): Cloning and Expression of huXAG-2 in CHO Cells The vector pC4 is used for the expression of huXAG-2 protein The plasmid pC4 is digested with the restriction enzymes Bell and Asp7181 and then dephosphorylated using calf intestinal phosphatase by procedures known in the art The vector is then isolated from a 1% agarose gel The DNA sequence encoding the complete huXAG-2 protein including its leader sequence is amplified using PCR oligonucleotide primers corresponding to the 5' and 3' sequences of the gene The 5' primer has the sequence 5' GACT TGATCA GCCATC ATG GAG ACG CGG CCT CGT CTC GGG GCC ACC TG 3' (SEQ ID NO 31) containing the underlined Bell restriction enzyme site followed by an efficient signal for initiation of translation in eukaryotes, as described by Kozak, M , J. Mol Biol 796 947-950 (1987), and 32 bases of the coding sequence of huXAG-2 shown in Figure 2 (SEQ ID NO 3) The 3' primer has the sequence 5 * GACT GGTACC GAA GGG GCA CAT TCA TGT TAC AAT TCA TCT TCA AG 3' (SEQ ID NO. 32) containing the underlined Asp7181 restriction site followed by 35 nucleotides complementary to the non-translated region of the huXAG-2 gene shown in Figure 2 (SEQ ID NO.3) The amplified fragment is digested with the endonucleases Bell and Asp718I and then purified again on a 1% agarose gel The isolated fragment and the dephosphorylated vector are then ligated with T4 DNA ligase E. coli HBlOl or XL-1 Blue cells are then transformed and bacteria are identified that contain the fragment inserted into plasmid pC4 using, for instance, restriction enzyme analysis Chinese hamster ovary cells lacking an active DHFR gene are used for transfection 5 μg of the expression plasmid pC4 is cotransfected with 0.5 μg of the plasmid pSV2-neo using lipofectin The cells are seeded in alpha minus MEM supplemented with 1 mg/ml G418 After 2 days, the cells are trypsinized and seeded in hybridoma cloning plates (Greiner, Germany) in alpha minus MEM supplemented with 10, 25, or 50 ng/ml of metothrexate plus 1 mg/ml G418 After about 10-14 days single clones are trypsinized and then seeded in 6- well petri dishes or 10 ml flasks using different concentrations of methotrexate (50 nM, 100 nM, 200 nM, 400 nM, 800 nM) Clones growing at the highest concentrations of methotrexate are then transferred to new 6-well plates containing even higher concentrations of methotrexate ( 1 μM, 2 μM, 5 μM, 10 μM, 20 μM) The same procedure is repeated until clones are obtained which grow at a concentration of 100 - 200 μM Expression of the desired gene product is analyzed, for instance, by SDS-PAGE and Western blot or by reverse phase HPLC analysis Example 7(f): Cloning and Expression of huXAG-3 in CHO Cells The vector pC4 is also used for the expression of huXAG-3 protein The plasmid pC4 is digested with the restriction enzymes BamHI and Asp718I and then dephosphorylated using calf intestinal phosphatase by procedures known in the art The vector is then isolated from a 1% agarose gel The DNA sequence encoding the complete huXAG-3 protein including its leader sequence is amplified using PCR oligonucleotide primers corresponding to the 5' and 3' sequences of the gene The 5' primer has the sequence 5' GACT GGATCC GCC ATC ATG ATG CTA CAC TCA GCT TTG GGT CTC TGC CTC 3' (SEQ ED NO:33) containing the underlined BamHI restriction enzyme site followed by an efficient signal for initiation of translation in eukaryotes, as described by Kozak, M , J. Mol Biol 796 947-950 (1987), and 33 bases of the coding sequence of huXAG-3 shown in Figure 3 (SEQ ID NO 5) The 3' primer has the sequence 5'GACT GGTACC GAA GGC TTT TTT CTA TCA TCT CTT ATA GCT CCT CAT ATG 3' (SEQ ID NO 34) containing the underlined Asp718I restriction site followed by 31 nucleotides complementary to the non-translated region of the huXAG-3 gene shown in Figure 3 (SEQ ID NO:5) The amplified fragment is digested with the endonucleases BamHI and Asp718I and then purified again on a 1% agarose gel The isolated fragment and the dephosphorylated vector are then ligated with T4 DNA ligase. E. coli HB101 or XL-1 Blue cells are then transformed and bacteria are identified that contain the fragment inserted into plasmid pC4 using, for instance, restriction enzyme analysis Chinese hamster ovary cells lacking an active DHFR gene are used for transfection 5 μg of the expression plasmid pC4 is cotransfected with 0 5 μg of the plasmid pSV2-neo using lipofectin The cells are seeded in alpha minus MEM supplemented with 1 mg/ml G418. After 2 days, the cells are trypsinized and seeded in hybridoma cloning plates (Greiner, Germany) in alpha minus MEM supplemented with 10, 25, or 50 ng/ml of metothrexate plus 1 mg/ml G418 After about 10-14 days single clones are trypsinized and then seeded in 6-well petri dishes or 10 ml flasks using different concentrations of methotrexate (50 nM, 100 nM, 200 nM, 400 nM, 800 nM) Clones growing at the highest concentrations of methotrexate are then transferred to new 6-well plates containing even higher concentrations of methotrexate (1 μM, 2 μM, 5 μM, 10 μM, 20 μM) The same procedure is repeated until clones are obtained which grow at a concentration of 100 - 200 μM Expression of the desired gene product is analyzed, for instance, by SDS-PAGE and Western blot or by reverse phase HPLC analysis Example 8: Tissue distribution of huXAG-l mRNA expression Northern blot analysis was carried out to examine the levels of expression of the gene encoding huXAG- 1 in human tissues, using methods described by, among others, Sambrook et al, cited above A cDNA probe containing the entire nucleotide sequence of the huXAG-l protein of the present invention (SEQ ID NO: l) was labeled with M P using the redipή e™ DNA labeling system (Amersham Life Science), according to manufacturer's instructions After labelling, the probe was purified using a CHROMA SPIN- 100™ column (Clontech Laboratories, Inc ), according to manufacturer's protocol number PT 1200-1 The purified labelled probe was then used to examine various human tissues for the expression of the gene encoding the huXAG-l Multiple Tissue Northern (MTN) blots containing various human tissues (H) or human immune system tissues (IM) are obtained from Clontech and were examined with labelled probe using ExpressHyb™ Hybridization Solution (Clontech) according to manufacturer's protocol number PT1 190-1 Following hybridization and washing, the blots were mounted and exposed to film at -70°C overnight, and films developed according to standard procedures A signal was detected in cells derived from a human colon carcinoma No signal was detected in any other tissue further confirming the gene is colon cancer specific Example 9: Tissue distribution of huXAG-2 mRNA expression Northern blot analysis was carried out to examine huXAG-2 gene expression in human tissues, using methods described in Example 8 The expression of huXAG-2 was found to be ubiquitous Example 10: Tissue distribution ofhuXAG-3 mRNA expression Northern blot analysis was carried out to examine huXAG-3 gene expression in human tissues, using methods described in Example 8 Expression was detected in colon, intestine, and lung tissue It will be clear that the invention may be practiced otherwise than as particularly described in the foregoing description and examples Numerous modifications and variations of the present invention are possible in light of the above teachings and, therefore, are within the scope of the appended claims The entire disclosure of all publications (including patents, patent applications, journal articles, laboratory manuals, books, or other documents) cited herein are hereby incorporated by reference SEQUENCE LISTING (1) GENERAL INFORMATION: (1) APPLICANT: HUMAN GENOME SCIENCES, INC. 9410 KEY WEST AVENUE ROCKVILLE, MD 20850 UNITED STATES OF AMERICA APPLICANTS/INVENTORS: YU, GUO-LIANG DILLON, PATRICK J. EBNER, REINHARD ENDRESS, GREGORY A. (ll) TITLE OF INVENTION: NOVEL HUMAN GROWTH FACTORS (111) NUMBER OF SEQUENCES: 45 (IV) CORRESPONDENCE ADDRESS: (A) ADDRESSEE: STERNE, KESSLER, GOLDSTEIN & FOX, P.L.L.C. (B) STREET: 1100 NEW YORK AVENUE, SUITE 600 (C) CITY: WASHINGTON (D) STATE: DC (E) COUNTRY: US (F) ZIP: 20005-3934 (v) COMPUTER READABLE FORM: (A) MEDIUM TYPE: Floppy disk (B) COMPUTER: IBM PC compatible (C) OPERATING SYSTEM: PC-DOS/MS-DOS (D) SOFTWARE: Patentin Release #1.0, Version #1.30 (vi ) CURRENT APPLICATION DATA: (A) APPLICATION NUMBER: (B) FILING DATE: (C) CLASSIFICATION: (vii) PRIOR APPLICATION DATA: (A) APPLICATION NUMBER: PCT/US96/ 13766 (B) FILING DATE: 23-AUG-1996 (vm) ATTORNEY/AGENT INFORMATION: (A) NAME: GOLDSTEIN, JORGE A. (B) REGISTRATION NUMBER: 29,021 (C) REFERENCE/DOCKET NUMBER: 1488.050PC01 (IX) TELECOMMUNICATION INFORMATION: (A) TELEPHONE: (202) 371-2600 (B) TELEFAX: (202) 371-2540 (2) INFORMATION FOR SEQ ID NO : 1 : (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 875 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS : double (D) TOPOLOGY: linear (l ) MOLECULE TYPE: cDNA (IX) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 71..595 (ix) FEATURE: (A) NAME/KEY: mat_peptide (B) LOCATION: 131..595 (ix) FEATURE: (A) NAME/KEY: sig_peptide (B) LOCATION: 71..130 (x ) SEQUENCE DESCRIPTION: SEQ ID NO : 1 : CGAGCGGCAC GAGCCGATTC CTAGCCGCCG ACTCACACAA GGCAGGTGGG TGAGGAAATC 60 CAGAGTTGCC ATG GAG AAA ATT CCA GTG TCA GCA TTC TTG CTC CTT GTG 109 Met Glu Lys lie Pro Val Ser Ala Phe Leu Leu Leu Val -20 -15 -10 GCC CTC TCC TAC ACT CTG GCC AGA GAT ACC ACA GTC AAA CCT GGA GCC 157 Ala Leu Ser Tyr Thr Leu Ala Arg Asp Thr Thr Val Lys Pro Gly Ala -5 1 5 AAA AAG GAC ACA AAG GAC TCT CGA CCC AAA CTG CCC CAG ACC CTC TCC 205 Lys Lys Asp Thr Lys Asp Ser Arg Pro Lys Leu Pro Gin Thr Leu Ser 10 15 20 25 AGA GGT TGG GGT GAC CAA CTC ATC TGG ACT CAG ACA TAT GAA GAA GCT 253 Arg Gly Trp Gly Asp Gin Leu lie Trp Thr Gin Thr Tyr Glu Glu Ala 30 35 40 CTA TAT AAA TCC AAG ACA AGC AAC AAA CCC TTG ATG ATT ATT CAT CAC 301 Leu Tyr Lys Ser Lys Thr Ser Asn Lys Pro Leu Met lie lie His His 45 50 55 TTG GAT GAG TGC CCA CAC AGT CAA GCT TTA AAG AAA GTG TTT GCT GAA 349 Leu Asp Glu Cys Pro His Ser Gin Ala Leu Lys Lys Val Phe Ala Glu 60 65 70 AAT AAA GAA ATC CAG AAA TTG GCA GAG CAG TTT GTC CTC CTC AAT CTG 397 Asn Lys Glu lie Gin Lys Leu Ala Glu Gin Phe Val Leu Leu Asn Leu 75 80 85 GTT TAT GAA ACA ACT GAC AAA CAC CTT TCT CCT GAT GGC CAG TAT GTC 445 Val Tyr Glu Thr Thr Asp Lys His Leu Ser Pro Asp Gly Gin Tyr Val 90 95 100 105 CCC AGG ATT ATG TTT GTT GAC CCA TCT CTG ACA GTT AGA GCC GAT ATC 493 Pro Arg lie Met Phe Val Asp Pro Ser Leu Thr Val Arg Ala Asp lie 110 115 120 ACT GGA AGA TAT TCA AAT CGT CTC TAT GCT TAC GAA CCT GCA GAT ACA 5 1 Thr Gly Arg Tyr Ser Asn Arg Leu Tyr Ala Tyr Glu Pro Ala Asp Thr 125 130 135 GCT CTG TTG CTT GAC AAC ATG AAG AAA GCT CTC AAG TTG CTG AAG ACT 589 Ala Leu Leu Leu Asp Asn Met Lys Lys Ala Leu Lys Leu Leu Lys Thr 140 145 150 GAA TTG TAAAGAAAAA AAATCTCCAA GCCCTTCTGT CTGTCAGGCC TTGAGACTTG 645 Glu Leu 155 AAACCAGAAG AAGTGTGAGA AGACTGGCTA GTGTGGAAGC ATAGTGAACA CACTGATTAG 705 GTTATGGTTT AATGTTACAA CAACTATTTT TTAAGAAAAA CAAGTTTTAG AAATTTGGTT 765 TCAAGTGTAC ATGTGTGAAA ACAATATTGT ATACTACCAT AGTGAGCCAT GATTTTCTAA 825 AAAAAAAAAT AAATGTTTTG GGGGTGTTCT GTTTTCTCCC AAAAAAAAAA 875 (2) INFORMATION FOR SEQ ID NO : 2 : (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 175 ammo acids (B) TYPE: amino ac d (D) TOPOLOGY: linear (ii) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 2: Met Glu Lys lie Pro Val Ser Ala Phe Leu Leu Leu Val Ala Leu Ser -20 -15 -10 -5 Tyr Thr Leu Ala Arg Asp Thr Thr Val Lys Pro Gly Ala Lys Lys Asp 1 5 10 Thr Lys Asp Ser Arg Pro Lys Leu Pro Gin Thr Leu Ser Arg Gly Trp 15 20 25 Gly Asp Gin Leu lie Trp Thr Gin Thr Tyr Glu Glu Ala Leu Tyr Lys 30 35 40 Ser Lys Thr Ser Asn Lys Pro Leu Met lie lie His His Leu Asp Glu 45 50 55 60 Cys Pro His Ser Gin Ala Leu Lys Lys Val Phe Ala Glu Asn Lys Glu 65 70 75 He Gin Lys Leu Ala Glu Gin Phe Val Leu Leu Asn Leu Val Tyr Glu 80 85 90 Thr Thr Asp Lys His Leu Ser Pro Asp Gly Gin Tyr Val Pro Arg He 95 100 105 Met Phe Val Asp Pro Ser Leu Thr Val Arg Ala Asp He Thr Gly Arg 110 115 120 Tyr Ser Asn Arg Leu Tyr Ala Tyr Glu Pro Ala Asp Thr Ala Leu Leu 125 130 135 140 Leu Asp Asn Met Lys Lys Ala Leu Lys Leu Leu Lys Thr Glu Leu 145 150 155 (2) INFORMATION FOR SEQ ID NO: 3: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1423 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS : double (D) TOPOLOGY: linear (il) MOLECULE TYPE: cDNA ( ιx ) FEATURE : (A) NAME/KEY: CDS (B) LOCATION: 88..603 (ix) FEATURE: (A) NAME/KEY: mat_peptιde (B) LOCATION: 157..603 (IX) FEATURE: (A) NAME/KEY: sιg_peptιde (B) LOCATION: 88..156 (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 3: GAGCGGCGCT CGGCGAACTG TGTGGACCGT CTGCTGGGAC TCCGGCCCTG CGTCCGCTCA 60 GCCCCGTGGC CCCGCGCACC TACTGCC ATG GAG ACG CGG CCT CGT CTC GGG 111 Met Glu Thr Arg Pro Arg Leu Gly -23 -20 GCC ACC TGT TTG CTG GGC TTC AGT TTC CTG CTC CTC GTC ATC TCT TCT 159 Ala Thr Cys Leu Leu Gly Phe Ser Phe Leu Leu Leu Val He Ser Ser -15 -10 -5 1 GAT GGA CAT AAT GGG CTT GGA AAG GGT TTT GGA GAT CAT ATT CAT TGG 207 Asp Gly His Asn Gly Leu Gly Lys Gly Phe Gly Asp H s He His Trp 5 10 15 AGG ACA CTG GAA GAT GGG AAG AAA GAA GCA GCT GCC AGT GGA CTG CCC 255 Arg Thr Leu Glu Asp Gly Lys Lys Glu Ala Ala Ala Ser Gly Leu Pro 20 25 30 CTG ATG GTG ATT ATT CAT AAA TCC TGG TGT GGA GCT TGC AAA GCT CTA 303 Leu Met Val He He His Lys Ser Trp Cys Gly Ala Cys Lys Ala Leu 35 40 45 AAG CCC AAA TTT GCA GAA TCT ACG GAA ATT TCA GAA CTC TCC CAT AAT 351 Lys Pro Lys Phe Ala Glu Ser Thr Glu He Ser Glu Leu Ser His Asn 50 55 60 65 TTT GTT ATG GTA AAT CTT GAG GAT GAA GAG GAA CCC AAA GAT GAA GAT 399 Phe Val Met Val Asn Leu Glu Asp Glu Glu Glu Pro Lys Asp Glu Asp 70 75 80 TTC AGC CCT GAC GGG GGT TAT ATT CCA CGA ATC CTT TTT CTG GAT CCC 447 Phe Ser Pro Asp Gly Gly Tyr He Pro Arg He Leu Phe Leu Asp Pro 85 90 95 AGT GGC AAG GTG CAT CCT GAA ATC ATC AAT GAG AAT GGA AAC CCC AGC 495 Ser Gly Lys Val His Pro Glu He He Asn Glu Asn Gly Asn Pro Ser 100 105 110 TAC AAG TAT TTT TAT GTC AGT GCC GAG CAA GTT GTT CAG GGG ATG AAG 543 Tyr Lys Tyr Phe Tyr Val Ser Ala Glu Gin Val Val Gin Gly Met Lys 115 120 125 GAA GCT CAG GAA AGG CTG ACG GGT GAT GCC TTC AGA AAG AAA CAT CTT 591 Glu Ala Gin Glu Arg Leu Thr Gly Asp Ala Phe Arg Lys Lys His Leu 130 135 140 145 GAA GAT GAA TTG TAACATGAAT GTGCCCCTTC TTTCATCAGA GTTAGTGTTC 643 Glu Asp Glu Leu TGGAAGGAAA GCAGCAGGGA AGGGAATATT GAGGAATCAT CTAGAACAAT TAAGCCGACC 703 AGGAAACCTC ATTCCTACCT ACACTGGAAG GAGCGCTCTC ACTGTGGAAG AGTTCTGCTA 763 ACAGAAGCTG GTCTGCATGT TTGTGGATCC AGCGGAGAGT GGCAGACTTT CTTCTCCTTT 823 TCCCTCTCAC CTAAATGTCA ACTTGTCATT GAATGTAAAG AATGAAACCT TCTGACACAA 883 AACTTGAGCC ACTTGGATGT TTACTCCTCG CACTTAAGTA TTTGAGTCTT TTCCCATTTC 943 CTCCCACTTT ACTCACCTTA GTGGTGAAAG GAGACTAGTA GCATCTTTTC TACAACGTTA 1003 AAATTGCAGA AGTAGCTTAT CATTAAAAAA CAACAACAAC AACAATAACA ATAAATCCTA 1063 AGTGTAAATC AGTTATTCTA CCCCCTACCA AGGATATCAG CCTGTTTTTT CCCTTTTTTC 1123 TCCTGGGAAT AATTGTGGGC TTCTTCCCAA ATTTCTACAG CCTCTTTCCT CTTCTCATGC 1183 TTGAGCTTCC CTGTTTGCAC GCATGCGTGT GCAGGACTGG CTGTGTGCTT GGACTCGGCT 1243 CCAGGTGGAA GCATGCTTTC CCTTGTTACT GTTGGAGAAA CTCAAACCTT CAAGCCCTAG 1303 GTGTAGCCAT TTTGTCAAGT CATCAACTGT ATTTTTGTAC TGGCATTAAC AAAAAAAGAG 1363 ATAAAATATT GTACCATTAA ACTTTAATAA AACTTTAAAA GGAAAAAAAA AAAAAAAAAA 1423 (2) INFORMATION FOR SEQ ID NO : : (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 172 ammo acids (B) TYPE: ammo acid (D) TOPOLOGY: linear (li) MOLECULE TYPE: protein (Xl) SEQUENCE DESCRIPTION: SEQ ID NO : 4 : Met Glu Thr Arg Pro Arg Leu Gly Ala Thr Cys Leu Leu Gly Phe Ser -23 -20 -15 -10 Phe Leu Leu Leu Val He Ser Ser Asp Gly His Asn Gly Leu Gly Lys -5 1 5 Gly Phe Gly Asp His He His Trp Arg Thr Leu Glu Asp Gly Lys Lys 10 15 20 25 Glu Ala Ala Ala Ser Gly Leu Pro Leu Met Val He He His Lys Ser 30 35 40 Trp Cys Gly Ala Cys Lys Ala Leu Lys Pro Lys Phe Ala Glu Ser Thr 45 50 55 Glu He Ser Glu Leu Ser His Asn Phe Val Met Val Asn Leu Glu Asp 60 65 70 Glu Glu Glu Pro Lys Asp Glu Asp Phe Ser Pro Asp Gly Gly Tyr He 75 80 85 Pro Arg He Leu Phe Leu Asp Pro Ser Gly Lys Val His Pro Glu He 90 95 100 105 He Asn Glu Asn Gly Asn Pro Ser Tyr Lys Tyr Fhe Tyr Val Ser Ala 110 115 120 Glu Gin Val Val Gin Gly Met Lys Glu Ala Gin Glu Arg Leu Thr Gly 125 130 135 Asp Ala Phe Arg Lys Lys His Leu Glu Asp Glu Leu 140 145 (2) INFORMATION FOR SEQ ID NO: 5: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 732 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: double (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (ix) FEATURE: (A) NAME/KEY: CDS (B) LOCATION: 49..546 (ix) FEATURE: (A) NAME/KEY: mat_peptide (B) LOCATION: 118..546 (ix) FEATURE: (A) NAME/KEY: sig_peptιde (B) LOCATION: 49..117 (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 5: CAAGAGCACT GGCCAAGTCA GCTTCTTCTG AGAGAGTCTC TAGAAGAC ATG ATG CTA 57 Met Met Leu -23 CAC TCA GCT TTG GGT CTC TGC CTC TTA CTC GTC ACA GTT TCT TCC AAC 105 His Ser Ala Leu Gly Leu Cys Leu Leu Leu Val Thr Val Ser Ser Asn -20 -15 -10 -5 CTT GCC ATT GCA ATA AAA AAG GAA AAG AGG CCT CCT CAG ACA CTC TCA 153 Leu Ala He Ala He Lys Lys Glu Lys Arg Pro Pro Gin Thr Leu Ser 1 5 10 AGA GGA TGG GGA GAT GAC ATC ACT TGG GTA CAA ACT TAT GAA GAA GGT 201 Arg Gly Trp Gly Asp Asp He Thr Trp Val Gin Thr Tyr Glu Glu Gly 15 20 25 CTC TTT TAT GCT CAA AAA AGT AAG AAG CCA TTA ATG GTT ATT CAT CAC 24S Leu Phe Tyr Ala Gin Lys Ser Lys Lys Pro Leu Met Val He His His 30 35 40 CTG GAG GAT TGT CAA TAC TCT CAA GCA CTA AAG AAA GTA TTT GCC CAA 297 Leu Glu Asp Cys Gin Tyr Ser Gin Ala Leu Lys Lys Val Phe Ala Gin 45 50 55 60 AAT GAA GAA ATA CAA GAA ATG GCT CAG AAT AAG TTC ATC ATG CTA AAC 345 Asn Glu Glu He Gin Glu Met Ala Gin Asn Lys Phe He Met Leu Asn 65 70 75 CTT ATG CAT GAA ACC ACT GAT AAG AAT TTA TCA CCT GAT GGG CAA TAT 393 Leu Met His Glu Thr Thr Asp Lys Asn Leu Ser Pro Asp Gly Gin Tyr 80 85 90 GTG CCT AGA ATC ATG TTT GTA GAC CCT TCT TTA ACA GTT AGA GCT GAC 441 Val Pro Arg He Met Phe Val Asp Pro Ser Leu Thr Val Arg Ala Asp 95 100 105 ATA GCT GGA AGA TAC TCT AAC AGA TTG TAC ACA TAT GAG CCT CGG GAT 489 He Ala Gly Arg Tyr Ser Asn Arg Leu Tyr Thr Tyr Glu Pro Arg Asp 110 115 120 TTA CCC CTA TTG ATA GAA AAC ATG AAG AAA GCA TTA AGA CTT ATT CAG 537 Leu Pro Leu Leu He Glu Asn Met Lys Lys Ala Leu Arg Leu He Gin 125 130 135 140 TCA GAG CTA TAAGAGATGA TAGAAAAAAG CCTTCACTTC AAAGAAGTCA 586 Ser Glu Leu AATTTCATGA AGAAAACCTC TGGCACATTG ACAAATACTA AATGTGCAAG TATATAGATT 646 TTGTAATATT ACTATTTAGT TTTTTTAATG TGTTTGCAAT AGTCTTATTA AAATAAATGT 706 TTTTTAAAAA AAAAAAAAAA AAAAAA 732 (2) INFORMATION FOR SEQ ID NO: 6: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 166 am o acids (B) TYPE: amino ac d (D) TOPOLOGY: linear (n) MOLECULE TYPE: protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 6 : Met Met Leu His Ser Ala Leu Gly Leu Cys Leu Leu Leu Val Thr Val -23 -20 -15 -10 Ser Ser Asn Leu Ala He Ala He Lys Lys Glu Lys Arg Pro Pro Gin -5 1 5 Thr Leu Ser Arg Gly Trp Gly Asp Asp He Thr Trp Val Gin Thr Tyr 10 15 20 25 Glu Glu Gly Leu Phe Tyr Ala Gin Lys Ser Lys Lys Pro Leu Met Val 30 35 40 He His His Leu Glu Asp Cys Gin Tyr Ser Gin Ala Leu Lys Lys Val 45 50 55 Phe Ala Gin Asn Glu Glu He Gin Glu Met Ala Gin Asn Lys Phe He 60 65 70 Met Leu Asn Leu Met His Glu Thr Thr Asp Lys Asn Leu Ser Pro Asp 75 80 85 Gly Gin Tyr Val Pro Arg He Met Phe Val Asp Pro Ser Leu Thr Val 90 95 100 105 Arg Ala Asp He Ala Gly Arg Tyr Ser Asn Arg Leu Tyr Thr Tyr Glu 110 115 120 Pro Arg Asp Leu Pro Leu Leu He Glu Asn Met Lys Lys Ala Leu Arg 125 130 135 Leu He Gin Ser Glu Leu 140 (2) INFORMATION FOR SEQ ID NO : 7 : ( ) SEQUENCE CHARACTERISTICS: (A) LENGTH: 183 ammo acids (B) TYPE: amino acid (C) STRANDEDNESS: not relevant (D) TOPOLOGY: linear (li) MOLECULE TYPE: peptide (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 7 : Met Gin Ala Gly Leu Ser Leu Val Cys Leu Val Leu Leu Cys Ser Ala 1 5 10 15 Leu Gly Glu Ala Val Leu Lys Lys Pro Lys Lys Gin Ala Gly Thr Thr 20 25 30 Asp Thr Lys Thr Asp Gin Glu Pro Ala Pro He Lys Thr Lys Gly Leu 35 40 45 Lys Thr Leu Asp Arg Gly Trp Gly Glu Ser He Glu Trp Val Gin Thr 50 55 60 Tyr Glu Glu Gly Leu Ala Lys Ala Arg Glu Asn Asn Lys Pro Leu Met 65 70 75 80 Val He His His Leu Glu Asp Cys Pro Tyr Ser lie Ala Leu Lys Lys 85 90 95 Ala Phe Val Ala Asp Arg Met Ala Gin Lys Leu Ala Gin Glu Asp Phe 100 105 110 He Met Leu Asn Leu Val His Pro Val Ala Asp Glu Asn Gin Ser Pro 115 120 125 Asp Gly His Tyr Val Pro Arg Val He Phe He Asp Pro Ser Leu Thr 130 135 140 Val Arg Ser Asp Leu Lys Gly Arg Tyr Gly Asn Lys Met Tyr Ala Tyr 145 150 155 160 Asp Ala Asp Asp He Pro Glu Leu He Thr Asn Met Lys Lys Ala Lys 165 170 175 Ser Phe Leu Lys Thr Glu Leu 180 (2) INFORMATION FOR SEQ ID NO: 8: (1) SEQUENCE CHARACTERISTICS: (A) LENGTH: 170 ammo acids (B) TYPE: amino acid (C) STRANDEDNESS: not relevant (D) TOPOLOGY: linear In) MOLECULE TYPE: peptide (XI) SEQUENCE DESCRIPTION: SEQ ID NO : 8 : Met Glu Xaa Xaa Xaa Xaa Leu Gly Ala Cys Leu Leu Leu Val Ala Leu 1 5 10 15 Ser Xaa Xaa Leu Ala Xaa Xaa Xaa Lys Gly Lys Asp Xaa Arg Pro He 20 25 30 Lys Gly Pro Gin Thr Leu Ser Arg Gly Trp Gly Asp Xaa He Xaa Trp 35 40 45 Val Gin Thr Tyr Glu Glu Gly Leu Xaa Lys Ala Xaa Xaa Ser Asn Lys 50 55 60 Pro Leu Met Val He His His Leu Glu Asp Cys Pro Tyr Ser Gin Ala 65 70 75 80 Leu Lys Lys Val Phe Ala Glu Asn Xaa Glu He Gin Glu Leu Ala Gin 85 90 95 Asn Phe Val Met Leu Asn Leu Val His Glu Thr Thr Asp Glu Asn Leu 100 105 110 Ser Pro Asp Gly Gin Tyr Val Pro Arg He Met Phe Val Asp Pro Ser 115 120 125 Leu Thr Val Arg Ala Asp He Xaa Gly Arg Tyr Gly Asn Arg Leu Tyr 130 135 140 Ala Tyr Glu Pro Xaa Asp Xaa Pro Leu Leu He Xaa Asn Met Lys Lys 145 150 155 160 Ala Leu Lys Leu Leu Lys Thr Glu Leu Xaa 165 170 (2) INFORMATION FOR SEQ ID NO : 9 : (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 489 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (n) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO : 9 : AATTCGGCAN AGGATCCTAG CCGCCGACTC ACACAAGGCA GAGTTGCCAT GGAGAAAATT 60 CCAGTGTCAG CATTCTTGCT CCTTGTGGCC CTCTCCTACA CTCTGGCCAG AGATACCACA 120 GTCAAACCTG GAGCCAAAAA GGACACAAAG GACTTTCGAC CCAAACTGCC CCAGACCCTC 180 TCCAGAGGTT GGGGTGACCA ACTTCATCTG GACTCAGACA TATGAAGAAG CTCTTATATN 240 AAATCCAAGA CAAGCAACAA ACCCTTGATG ATTATTCATC ACTTGGGTGA GTGCCCACAC 300 AGTTCAAGTT TTTAAAGAAA GTGTTTNGCT GGAAATTAAN GAANTCCGGN AATTGGGNNG 360 AGCAGTTTGT NCCCCNTNAA TTTGGGTTTT GGAAACAATG GGCAAACACC TTTTTTGTTG 420 NTGGNCNATT TTTCCCCGGN TTTTTTTTTT TGGCCCCTTT TTNNAANTTA NGGGCGGTTT 480 TCATGGGGG 489 (2) INFORMATION FOR SEQ ID NO: 10: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 506 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (n) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 10: AATTCGGCAN AGGAAGACAA GCAACAAACC CTTGATGATT ATTCATCANT TGGATGAGTG 60 CCCACACAGT CAAGCTTTAA AGAAAGTGTT TGCTGAAAAT AAAGAAATCC AGAAATTGGC 120 AGAGCAGTTT GTCCTCCTCA ATCTGGTTTA TGAAACAACT GGACAAACAC CTTTCTCCTG 180 ATGGCCAGTA TGTNCCCAGG GTTATGTTTG TTGACCCATN TCTGGACAGT TAGAGCCGAT 240 ATCACTGGGA GGATATTTCA AACCGTNNCT TATGCTTACG GAACCTGGCA GGTTACAGGT 300 CTGTTTGCTT GGACCAACAT GNAGGAAAGG TTCTTCAAGT TTGGTTGNAN GGACTGGAAT 360 TTGTTNAAGG NANNAAAATT TTTCCAAGGC CTTTTGNTCT TGTTTAAGGN CTTNGGGGTT 420 TTGGAAACCC GNAGGAGNTG TTNAGAAGGA CTTGGTTAGT GTTGGGAGGC CNTNGTGGAA 480 CCCANTGGTT TNGGGTATGG GTTTAA 506 (2) INFORMATION FOR SEQ ID NO: 11: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 329 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (li) MOLECULE TYPE: cDNA (x ) SEQUENCE DESCRIPTION: SEQ ID NO: 11: ATTCGGAGAG CCATCTCTGA CAGTTAGAGC CGATATCACT GGAAGATATT CAATCGTCTC 60 TATGCTTACG ACCTGCAGAT ACAGTCTGTT NTTNCACATG AAGAAAGTCT CAAGTTGCTG 120 AAGACTGAAT TGTAAGAAAA ATCTCCAGCC CTTCTGTCTG CAGCTTGAGA CTTGAACCAG 180 AGAGTGTGAG AGCTGCTGTT GGAGNTAGTG ACNATGTTAG GTTGGTATGT ACACACTTTT 240 TTAGAACAGT TTGATTGGTC AGNTCNGGTA ACATTTTTCT CCTGGGCTGT TCAAAAAAAA 300 TGTNGGGTTC TTTCCCAAAA AAAAAAANG 329 (2) INFORMATION FOR SEQ ID NO: 12: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 329 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (11) MOLECULE TYPE: cDNA (XI) SEQUENCE DESCRIPTION: SEQ ID NO: 12: ATTCGGAGAG CCATCTCTGA CAGTTAGAGC CGATATCACT GGAAGATATT CAATCGTCTC 60 TATGCTTACG ACCTGCAGAT ACAGTCTGTT NTTNCACATG AAGAAAGTCT CAAGTTGCTG 120 AAGACTGAAT TGTAAGAAAA ATCTCCAGCC CTTCTGTCTG CAGCTTGAGA CTTGAACCAG 180 AGAGTGTGAG AGCTGCTGTT GGAGNTAGTG ACNATGTTAG GTTGGTATGT ACACACTTTT 240 TTAGAACAGT TTGATTGGTC AGNTCNGGTA ACATTTTTCT CCTGGGCTGT TCAAAAAAAA 300 TGTNGGGTTC TTTCCCAAAA AAAAAAANG 329 (2) INFORMATION FOR SEQ ID NO: 13: (1) SEQUENCE CHARACTERISTICS: (A) LENGTH: 329 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (n) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 13: ATTCGGAGAG CCATCTCTGA CAGTTAGAGC CGATATCACT GGAAGATATT CAATCGTCTC 60 TATGCTTACG ACCTGCAGAT ACAGTCTGTT NTTNCACATG AAGAAAGTCT CAAGTTGCTG 120 AAGACTGAAT TGTAAGAAAA ATCTCCAGCC CTTCTGTCTG CAGCTTGAGA CTTGAACCAG 180 AGAGTGTGAG AGCTGCTGTT GGAGNTAGTG ACNATGTTAG GTTGGTATGT ACACACTTTT 240 TTAGAACAGT TTGATTGGTC AGNTCNGGTA ACATTTTTCT CCTGGGCTGT TCAAAAAAAA 300 TGTNGGGTTC TTTCCCAAAA AAAAAAANG 329 (2) INFORMATION FOR SEQ ID NO: 14: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 329 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 14: ATTCGGAGAG CCATCTCTGA CAGTTAGAGC CGATATCACT GGAAGATATT CAATCGTCTC 60 TATGCTTACG ACCTGCAGAT ACAGTCTGTT NTTNCACATG AAGAAAGTCT CAAGTTGCTG 120 AAGACTGAAT TGTAAGAAAA ATCTCCAGCC CTTCTGTCTG CAGCTTGAGA CTTGAACCAG 180 AGAGTGTGAG AGCTGCTGTT GGAGNTAGTG ACNATGTTAG GTTGGTATGT ACACACTTTT 240 TTAGAACAGT TTGATTGGTC AGNTCNGGTA ACATTTTTCT CCTGGGCTGT TCAAAAAAAA 300 TGTNGGGTTC TTTCCCAAAA AAAAAAANG 329 (2) INFORMATION FOR SEQ ID NO: 15: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 330 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (Xl) SEQUENCE DESCRIPTION: SEQ ID NO: 15: ATTCGGCAGA GCCATCTCTG ACAGTTAGAG CCGATATCAC TGGAAGATAT TCAATCGTCT 60 CTATGCTTAC GACCTGCAGA TACAGTCTGT TNTTNCACAT GAAGAAAGTC TCAAGTTGCT 120 GAAGACTGAA TTGTAAGAAA AATCTCCAGC CCTTCTGTCT GCAGCTTGAG ACTTGAACCA 180 GAGAGTGTGA GAGCTGCTGT TGGAGNTAGT GACNATGTTA GGTTGGTATG TACACACTTT 240 TTTAGAACAG TTTGATTGGT CAGNTCNGGT AACATTTTTC TCCTGGGCTG TTCAAAAAAA 300 ATGTNGGGGT CTTTCCCAAA AAAAAAAANG 330 (2) INFORMATION FOR SEQ ID NO: 16: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 326 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (XI) SEQUENCE DESCRIPTION: SEQ ID NO: 16: CGGCGCTNGN CGAACTGTGT GGACCGTCTG CTGGGACTCC GGCCCTGCGT CCGCTCAGCC 60 CCGTGGCCCC GCGCACCTAC TGCCATGGAG ACGCGGCCTC GTCTCGGGGC CACCTGTTTG 120 CTGGGCTTCA GTTTCCTGCT CCTCGTCATC TCTTCTGATG GACATAATGG GCTTGGAAAG 180 GGTTTTGGAG ATCATATTCA TTGGAGGACA CTGGAAGATG GGAAGAAAGA AGCAGCTGCC 240 AGTGGACTGC CCCTGATGGT GATTATTCAT AAATCCTGGT GTGGAGCTTN GCAAAGTCTN 300 AAAGCCCAAA TTTGCAGAAT CTANGG 326 (2) INFORMATION FOR SEQ ID NO: 17: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 495 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 17: NNTTCGGCAN AGCNANCCAG GNNAACCTCA TTCCTACCTA CACTGGAAGG NGCGCTCTCA 60 CTGTGGAAGA NTTCTGCTAA CAGAAGCTGG TCTGCATGTT TNTGGATCCA GCGGAGAGTG 120 GCAGACTTNT TTCTCCTTTT CCCTCTNACC TAAATGTCAA CTTGTCATTG AATGTAAAGA 180 ATGAAACCTT CTGACACAAA ANTNGAGCCA CTTGGATGTT TACTCCTCGC ACTTAAGTAT 240 TTGANGCTTT NCCCATTTCC TCCCACTTTA CTCACCTTAG TGGTGAAAGG GAGACTAGTA 300 GCATCTTTNN CTACAACGTT AAAAATTGCA GAAGTAGCTT ATNCATGAAA AANCAACAGC 360 AACANCAATT AACAATTAAA TNCCCAAGGG GTAAANNCAG TTATTCTAAN CCCCTAACCA 420 GGGTTATCAG CCNGTTTNTT TCCCNNTTTT TTTCCCGGGN ATAATTGTGG GGNTTNTTNC 480 CAAATTNNTA CANNC 495 (2) INFORMATION FOR SEQ ID NO: 18: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 505 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xι) SEQUENCE DESCRIPTION: SEQ ID NO: 18: AATTCGGCAC GAGCGTGGCC CCGCGCACCT ACTGCCATGG AGACGCGGCC TCGTCTCGGG 60 GCCACCTGTT TGCTGGGCTT CAGTTTCCTG CTCCTCGTCA TCTCTTCTGA TGGACATAAT 120 GGGNTTGGAA AGGGTTTTGG AGATCATATT CATTGGAGGA CACTGGAAGA TGGGAAGAAA 180 GAAGCAGCTG CCAGTGGACT GCCCCTGATG GTGATTATTC ATAAATCCTG GNGTGGAGGT 240 TGCAAAGTCT AAAGCCCAAA TTTGCAGNAT CTACGGAAAT TTCAGAACTC TCCCATAATT 300 TTGGTAATGG TAAATCTTGA GGATGAGGAG GAACCAAAGG TGAAGNTTTA NCCCTTACGG 360 GGGGTATATT CCACGATCCT TTTTCTNGNC CCATGGCAAG TGCATCNGAA TCATCATGGG 420 TTGAACCCAG TTCAGATTTT TTNCANCCGG NANTTCAGGT TAGAGNAGAA GTTNGNTTCC 480 NAAATCGGTT AAGTNCNTTA AGTAG 505 (2) INFORMATION FOR SEQ ID NO: 19: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 302 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (XI) SEQUENCE DESCRIPTION: SEQ ID NO: 19: CTCGTGCGTA TAAGAAGCAG CTGCCAGTGG ACTGCCCCTG ATGGTGATTA TTCATAAATC 60 CTGGTGTGGA GCTTGCAAAG TCTAAAGCCC AAATTTGCAG AATCTACGGA AATTTCAGAA 120 CTCTCCCATA ATTTTGTTAT GGTAAATCTT GAGGATGAAG AGGAACCCAA AGATGAAGAT 180 TTCAGCCCTG ACGGGGGTTA TATTCCACGA ATCCTTTTTC TGGATCCCAG TGGCAAGGTG 240 CATNCTGAAA TCATCAATGA GAATGGAAAC CCCAGCTACA AGTATTTTTT ATTTCAGTGC 300 CG 302 (2) INFORMATION FOR SEQ ID NO: 20: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 347 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 20. GGCACGAGGG NAACCCCAGC TACAAGTATT TTTATGTCAG TCCCGAGCAA GTTGTTCAGG 60 GGATGAAGGA AGCTCAGGAA AGGCTGACGG GTGATGCCTT CAGAANGAAA CATCTTGAAG 120 CATAAATTGT AACATGAATG TNCCCCTTCT TTCATCAGAG TTAGTGTTCT GGAAGGAAAG 180 CAGCAGGGGN AGGGAATATT GAGGAATCAT CTAGAACAAT TAAGCCGACC AGGAAACCTN 240 ATTCCTACCT ACACTGGGAN GGAGCGCTCT TCACTGTGGA AGGAGTTTCG GCTAACCAGA 300 AGCTTGGTTC TGNCATGGTT TTGNTGGGAT NCCAGCGGAN GAGTGGG 347 (2) INFORMATION FOR SEQ ID NO: 21: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 322 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO:21: GGCAGAGGTA AACCCCAGCT ACAAGTATTT TTATGTCAGT NCCGAGCAAG TTGTTCAGGG 60 GATGAAGGAA GCTCAGGAAA GGCTGACGGG TGATGCCTTC AGAANGAAAC ATCTTGAAGA 120 NNNATTGTAA CATGGAATGT GCCCCTTCTT TCATCAGAGT TAGTGTTCTG GGAAGGAAAG 180 CAGCAGGGTT AGGGNATATT GAGGAATCAT CTAGAACAAT TAAAGCCGAC CAGGAAACCT 240 CATTNCTACC TACACTGGGA AGGAGCGCTC TCACTGTGNG AAGAGTTCCG GCTTAACAGN 300 AGCTNGGTTC TGNCATGTTT TG 322 (2) INFORMATION FOR SEQ ID NO: 22: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 225 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 22: TAATGGACAT AATGGGCTTG GAAAGGNTTT TGGAGATCAT ATTCATTGGA GGACACTGGA 60 AGATGGGAAG AAAGAAGCAG CTGCCAGTGG ACTGCCCCTN ATGGTGATTA TNCATAANTC 120 CTGGTGTGGA GCTTGCAAAG CTCTTAAAGC CCAAATTTNC AGAATCTACG GAAATTTCAG 180 AACTNTCCCA TAATTTNTTA ATGGTAAATC TTGAGGATGA AGAGG 225 (2) INFORMATION FOR SEQ ID NO: 23: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 25 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO:23: CGCCCATGGG CCAGAGATAC CACAG 25 (2) INFORMATION FOR SEQ ID NO: 24: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 28 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO:24: CGCAAGCTTT TACAATTCAG TCTTCAGC 28 (2) INFORMATION FOR SEQ ID NO: 25: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 46 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO:25: GACCGCACAT GTTCTGATGG ACATAATGGG CTTGGAAAGG GTTTTG 46 (2) INFORMATION FOR SEQ ID NO:26: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 49 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (il) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 26: GACCGCAAGC TTCTCTGATG AAAGAAGGGG CACATTCTTA TTACAATTC 49 (2) INFORMATION FOR SEQ ID NO: 27: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 45 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (11) MOLECULE TYPE: cDNA (XI) SEQUENCE DESCRIPTION: SEQ ID NO: 27: GACCGCTCAT GAATAAAAAA GGAAAAGAGG CCTCCTCAGA CACTC 45 (2) INFORMATION FOR SEQ ID NO: 28: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 49 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (11) MOLECULE TYPE: cDNA (XI) SEQUENCE DESCRIPTION: SEQ ID NO: 28: GACCGCAAGC TTCTTTGAAG TGAAGGCTTT TTTCTATCAT TTATTATAG 49 (2) INFORMATION FOR SEQ ID NO: 29: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 33 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO:29: CGCGGATCCG CCATCATGGA GAAAATTCCA GTG 33 (2) INFORMATION FOR SEQ ID NO: 30: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 28 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (11) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO:30: CGCGGATCCT TACAATTCAG TCTTCAGC 28 (2) INFORMATION FOR SEQ ID NO: 31: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 48 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (11) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO:31: GACTTGATCA GCCATCATGG AGACGCGGCC TCGTCTCGGG GCCACCTG 48 (2) INFORMATION FOR SEQ ID NO: 32: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 45 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (X ) SEQUENCE DESCRIPTION: SEQ ID NO: 32: GACTGGTACC GAAGGGGCAC ATTCATGTTA CAATTCATCT TCAAG 45 (2) INFORMATION FOR SEQ ID NO: 33: (1) SEQUENCE CHARACTERISTICS: (A) LENGTH: 49 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (11) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 33: GACTGGATCC GCCATCATGA TGCTACACTC AGCTTTGGGT CTCTGCCTC 49 (2) INFORMATION FOR SEQ ID NO: 34: ( ) SEQUENCE CHARACTERISTICS: (A) LENGTH: 49 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (11) MOLECULE TYPE: cDNA (Xl) SEQUENCE DESCRIPTION: SEQ ID NO: 34: GACTGGTACC GAAGGCTTTT TTCTATCATC TCTTATAGCT CCTCATATG 49 (2) INFORMATION FOR SEQ ID NO: 35: (1) SEQUENCE CHARACTERISTICS: (A) LENGTH: 386 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (XI) SEQUENCE DESCRIPTION: SEQ ID NO: 35: TCGACAGGAC ACAAAGGACT CTCGACCCAA ACTGCCCCAG ACCCTCTCCA GAGGTTGGGG 60 TGACAACTCA TCTGGACTCA GACATATGAA GAAGCTCTAT ATAAATCCAA GACAAGCAAC 120 AAACCCTTGA TGATTATTCA TCACTTGGAT GAGTGCCCAC ACAGTCAAGC TTTAAAGAAA 180 GTGTTTGCTG AAAATAAAGA AATCCAGAAA TTGGCAGAGC AGTTTGTCCT CCTCAATCTG 240 GTTTATGAAA CAACTGACAA ACACCTTTCT CCTGATGGCC AGTATGTCCC CAGGATTATG 300 TTTGTTGACC CATCTCTGAC AGTTAGAGCC GATATCACTG GAAGATATTC AAATCGTCTC 360 TATGCTTACG AACCTGCAGA TACAGC 386 (2) INFORMATION FOR SEQ ID NO: 36: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 373 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (11) MOLECULE TYPE: CDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 36: AGCCGCCGAC TCACACAAGG CAGGTGGGTG AGGAAATCCA GAGTTGCCAT GGAGAAAATT 60 CCAGTGTCAG CATTCTTGCT CCTTGTGGCC CTCTCCTACA CTCTGGCCAG AGATACCACA 120 GTCAAACCTG GAGCCAAAAA GGACACAAAG GACTCTCGAC TAAAACTGCC CCAGACCCTC 180 TCCAGAGGTT GGGGTGACCA ACTCATCTGG ACTCAGACAT ATGAAGAAGC TCTATATAAA 240 TCCAAGACAN GGCAACAAAC CCTTGATGAT TATTCATCAC TTGGGATGAG TGCCCACACA 300 GTTCANGTTT TTAANGGAAA GTTTTTTNTT GGAAATTTAA GGGAATTNCC GGGAATTGGG 360 CAGGGCAGTT TTT 373 (2) INFORMATION FOR SEQ ID NO: 37: (1) SEQUENCE CHARACTERISTICS: (A) LENGTH: 158 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (11) MOLECULE TYPE: cDNA (Xl) SEQUENCE DESCRIPTION: SEQ ID NO: 37: NCACTCCTAG CCGCCGACTC ACACAAGGCA GGTGGGTGAG GAAATCCAGA GTTGCCATGG 60 AGAAAATTCC AGTGTCAGCA TTCTTGCTCC TTGTGGCCCT CTCCTACACT CTGGCCAGAG 120 ATACCACAGT CAAACCTGGA GCCAAAAAGG ACACAAAG 158 (2) INFORMATION FOR SEQ ID NO: 38: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 136 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA ( i) SEQUENCE DESCRIPTION: SEQ ID NO: 38: CCCGCATCCT AGCCGCCGAC TCACACAAGG CAGGTGGGTG AGGAAATCCA GAGTTGCCAT 60 GGAGAAAATT CCAGTGTCAG CATTCTTGCT CCTTGTGGCC TCTCCTACAC TCTGGCAGAG 120 ATACCACAGT CAAACT 136 (2) INFORMATION FOR SEQ ID NO: 39: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 123 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 39: NNNTNTGGAG AAAACAGAAC ACCCCCAAAA CATTTATTTT TTTTTTTAGA AAATCAGGCT 60 CACTATGGTA GTATACAATA TTGTTTTCAC ACATGTACAC TTGAAACCAA ATTTCAAAAC 120 TTG 123 (2) INFORMATION FOR SEQ ID NO: 40: (1) SEQUENCE CHARACTERISTICS: (A) LENGTH: 311 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 0: TAATAAGACT ATTGCAAACA CATTAAAAAA ACTAAATAGT AATATTACAA AATCTATATA 60 CTTGCACATT TAGTATTTGT CAATGTGCCA GAGGTTTTCT TCATGAAATT TGACTTCTTT 120 GAAGTGAAGG CTTTTTTCTA TCATCTCTTA TAGCTCTGAC TGAATAAGTC TTAATGCTTT 180 CTTCATGTTT TCTATCAATA GGGGAAATCC CGAGGCTCAT ATGTGNACAA TCTGTTAGAG 240 NATCTCCAGC TATGTCAGCT CTAACTGTTA AAGAGGGTCT ACAAACATGA TTCTAGGGAC 300 ATATTGCCAT C 311 (2) INFORMATION FOR SEQ ID NO: 41: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 310 base pairs (B) TYPE: nucleic ac d (C) STRANDEDNESS: single (D) TOPOLOGY: linear (11) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 41: AGCACTGGCC AAGTCAGCTT CTTCTGAGAG AGTCTCTAGA AGACATGATG CTACACTCAG 60 CTTTGGGTCT CTGCCTCTTA CTCGTCACAG TTTCTTCCAA CCTTGCCATT GCAATAAAAA 120 AGGAAAAGAG GCCTCCTCAG ACACTCTCAA GAGGATGGGG AGATGACATC ACTTGGGTAC 180 AAACTTATGA AGAAGGTCTC TTTTATGCTC AAAAAAGTAA GGAAGCCATT AATGGGTTAT 240 TCATCACCTG GGGGGANTTG TCAATACTCT TCAAGGCACT TAAAGGNAAG TATTTTGCCC 300 CAAAATTGAA 310 (2) INFORMATION FOR SEQ ID NO: 42: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 44 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (Xl) SEQUENCE DESCRIPTION: SEQ ID NO: 2: GACCGCTCAT GAGAGATACC ACAGTCAAAC CTGGAGCCAA AAAG (2) INFORMATION FOR SEQ ID NO: 3: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 45 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 43: GACCGCAAGC TTGAAGGGCT TGGAGATTTT TTTTTATTAC AATTC 45 (2) INFORMATION FOR SEQ ID NO: 44: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 49 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 44: GACTGGATCC GCCATCATGG AGAAAATTCC AGTGTCAGCA TTCTTGCTC 49 (2) INFORMATION FOR SEQ ID NO: 45: (l) SEQUENCE CHARACTERISTICS: (A) LENGTH: 43 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ll) MOLECULE TYPE: cDNA (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 45: GACTGGTACC GGAGATTTTT TTTCTTTACA ATTCAGTCTT CAG 43 INDICATIONS RELATING TO A DEPOSITED MICROORGANISM (PCT Rule I3bis) A. The indications made below relate to the microorganism referred to in the description on page , line 17 B. IDENTIFICATION OF DEPOSIT Further deposits are identified on an additional sheet I I Name of depositary institution AMERICAN TYPE CULTURE COLLECTION Address of depositary institution (including postal code and country) 12301 Parklawn Drive Rockville, Maryland 20852 United States of America Date of deposit Accession Number June 27 , 1996 ATCC 97641 C. ADDITIONAL INDICATIONS (leave blank if not applicable) This information is continued on an additional sheet [~~] DNA Plasmid HG353811 D. DESIGNATED STATES FOR WHICH INDICATIONS ARE MADE (if the indications are not for all designated States) E. SEPARATE FURNISHING OF INDICATIONS (leave blank if not applicable) The indications listed below will be submitted to the Internaliona I Bureau later (specify the general nature of the indications e.g , "Accession Number of Deposit") For receiving Office use only For International Bureau use only I 1 This sheet was received with the international application I j This sheet was received by the International Bureau on- Authorized officer Aulhori7cd officer ' 117 INDICATIONS RELATING TO A DEPOSITED MICROORGANISM (PCT Rule 13->«) For receiving Office use only For International Bureau use only I j This sheet was received with the international application I ] This sheet was received by the International Bureau on Authori ed officer Authorized officer [ or I'C'l KO/π-l (July 1992) INDICATIONS RELATING TO A DEPOSITED MICROORGANISM (PCT Rule Ϊ3bis) A. The indications made below relate to the microorganism referred to in the description on page , line B. IDENTIFICATION OF DEPOSIT Further deposits are identified on an additional sheet j I Name of depositary institution AMERICAN TYPE CULTURE COLLECTION Address of depositary institution (including postal code and country) 12301 Parklawn Drive Rockville, Maryland 20852 United States of America Date of deposit Accession Number July 3 , 1997 ATCC 209137 C. ADDITIONAL INDICATIONS (leave blank if not applicable) This information is continued on an additional sheet Q] DNA Plasmid HSIEH63 D. DESIGNATED STATES FOR WHICH INDICATIONS ARE MADE (if the indications are not for all designated States) E. SEPARATE FURNISHING OF INDICATIONS (leave blank if not applicable) The indications listed below will be submitted to the International Bureau later (specify the general ature of ' the indications eg., 'Accession Number of Deposit") For receiving Office use only For International Bureau use only I j This sheet was received with the international application I I This sheet was received by the International Bureau on: Authorized officer Authorized officer Form l'Cι7KO/l 34 (Jul 1992

Claims: What Is Claimed Is: 1 An isolated nucleic acid molecule, comprising a polynucleotide having a nucleotide sequence at least 95% identical to a sequence selected from the group consisting of (a) a nucleotide sequence encoding a polypeptide comprising amino acids from about -20 to about 155 in SEQ ID NO:2, or amino acids from about -23 to about 149 in SEQ ID NO:4, or amino acids from about -23 to about 143 in SEQ ID NO: 6; (b) a nucleotide sequence encoding a polypeptide comprising amino acids from about -19 to about 155 in SEQ ID NO.2, or amino acids from about -22 to about 149 in SEQ ID NO:4, or amino acids from about -22 to about 143 in SEQ ID NO:6; (c) a nucleotide sequence encoding the polypeptide comprising amino acids from about 1 to about 155 in SEQ ID NO:2, or amino acids from about 1 to about 149 in SEQ ID NO:4 or amino acids from about 1 to about 143 in SEQ ID NO:6; (d) a nucleotide sequence encoding a full-length polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No. 97641 , or ATCC Deposit No 209134 or ATCC Deposit No 209137; (e) a nucleotide sequence encoding a mature polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No. 97641, or ATCC Deposit No 2091 4 or ATCC Deposit No 209137; and (f) a nucleotide sequence complementary to any of the nucleotide sequences in (a), (b), (c), (d), or (e) 2 An isolated nucleic acid molecule, comprising a polynucleotide which hybridizes under stringent hybridization conditions to a polynucleotide having a nucleotide sequence identical to a nucleotide sequence in (a), (b), (c), (d), (e), or (f) of claim 1 wherein said polynucleotide which does not hybridize under stringent hybridization conditions to a polynucleotide having a nucleotide sequence consisting of only A residues or of only T residues 3 An isolated nucleic acid molecule, comprising a polynucleotide which encodes the amino acid sequence of an epitope-bearing portion of a huXAG-l, huXAG-2, or huXAG-3 polypeptide having an amino acid sequence in (a), (b), (c), (d), or (e) of claim 1 4 An isolated nucleic acid molecule of claim 3, which encodes an epitope-bearing portion of a huXAG-l, huXAG-2 or huXAG-3 polypeptide selected from the group consisting of a polypeptide comprising amino acid residues from about -1 to about 23 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 24 to about 32 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 41 to about 52 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 70 to about 83 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 93 to about 105 in SEQ ID NO.2, a polypeptide comprising ammo acid residues from about 118 to about 130 in SEQ ID NO 2, a polypeptide comprising ammo acid residues from about -1 to about 15 in SEQ ID NO 4, a polypeptide comprising amino acid residues from about 20 to 30 about in SEQ ID NO 4, a polypeptide comprising amino acid residues from about 71 to about 89 in SEQ ID NO 4, a polypeptide comprising amino acid residues from about 97 to about 1 15 in SEQ ID NO 4, a polypeptide comprising amino acid residues from about 2 to about 21 in SEQ ED NO 6, a polypeptide comprising amino acid residues from about 81 to about 92 in SEQ ED NO 6, and a polypeptide comprising amino acid residues from about 109 to about 127 in SEQ ID NO 6 5 An isolated nucleic acid molecule, comprising a polynucleotide having a sequence selected from the group consisting of (a) a nucleotide sequence of a fragment of the sequence shown in SEQ ID NO 1, wherein said fragment comprises at least 50 contiguous nucleotides from SEQ ID NO 1, provided that said isolated nucleic acid molecule is not SEQ ED NO 9, SEQ ID NO 10, SEQ ID NO 1 1, SEQ ED NO 12, SEQ ID NO 13, SEQ ID NO 14, SEQ ED NO 15, SEQ ID NO 35, SEQ ID NO 36, SEQ ED NO 37, SEQ ID NO.38, SEQ ID NO 39, or any subfragment thereof, (b) a nucleotide sequence of a fragment of the sequence shown in SEQ ED NO 3, wherein said fragment comprises at least 50 contiguous nucleotides from SEQ ID NO 3, provided that said isolated nucleic acid molecule is not SEQ ED NO 16, SEQ ED NO 17, SEQ ED NO 18, SEQ ID NO 19, SEQ ID NO 20, SEQ ID NO 21, SEQ ID NO 22, SEQ ID NO 23, or any subfragment thereof, (c) a nucleotide sequence of a fragment of the sequence shown in SEQ ID NO 5, wherein said fragment comprises at least 50 contiguous nucleotides from SEQ ED NO 5, provided that said isolated nucleic acid molecule is not SEQ ID NO 40 or SEQ ED NO 41, or any subfragment thereof, and (d) a nucleotide sequence complementary to a nucleotide sequence in (a), (b), or (c) 6 A method for making a recombinant vector, comprising inserting an isolated nucleic acid molecule of claim 1 into a vector 7 A recombinant vector produced by the method of claim 6 8 A method of making a recombinant host cell, comprising introducing the recombinant vector of claim 7 into a host cell 9 A recombinant host cell produced by the method of claim 8 10. A recombinant method for producing a huXAG-l, huXAG-2 or huXAG-3 polypeptide, comprising culturing the recombinant host cell of claim 9 under conditions such that said polypeptide is expressed and recovering said polypeptide 1 1 An isolated polypeptide having an amino acid sequence at least 95% identical to a sequence selected from the group consisting of (a) amino acids from about -20 to about 155 in SEQ ID NO 2, or amino acids from about -23 to about 149 in SEQ ID NO 4, or amino acids from about -23 to about 143 in SEQ ID NO 6, (b) amino acids from about - 19 to about 155 in SEQ ID NO 2, or amino acids from about -22 to about 149 in SEQ ID NO 4, or amino acids from about -22 to about 143 in SEQ ID NO 6, (c) amino acids from about 1 to about 155 in SEQ ID NO 2, or amino acids from about 1 to about 149 in SEQ ID NO 4, or amino acids from about 1 to about 143 in SEQ ID NO 6, (d) the amino acid sequence of a full-length polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 97641, or ATCC Deposit No 209134 or ATCC Deposit No. 209137, (e) the amino acid sequence of a mature polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 97641, or ATCC Deposit No. 209134 or ATCC Deposit No 209137, and (f) the amino acid sequence of an epitope-bearing portion of any one of the polypeptides of (a), (b), (c), (d), or (e) 12. An isolated polypeptide of claim 1 1 , comprising an epitope-bearing portion of huXAG-l, huXAG-2 or huXAG-3 polypeptide, wherein said portion is selected from the group consisting of a polypeptide comprising amino acid residues from about -1 to about 23 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 24 to about 32 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 41 to about 52 in SEQ ID NO 2; a polypeptide comprising amino acid residues from about 70 to about 83 in SEQ ID NO 2, a polypeptide comprising amino acid residues from about 93 to about 105 in SEQ ID NO.2, a polypeptide comprising amino acid residues from about 1 18 to about 130 in SEQ ID NO.2, a polypeptide comprising amino acid residues from about -1 to about 15 in SEQ ID NO 4, a polypeptide comprising amino acid residues from about 20 to 30 about in SEQ ID NO 4, a polypeptide comprising amino acid residues from about 71 to about 89 in SEQ ID NO 4, a polypeptide comprising amino acid residues from about 97 to about 1 15 in SEQ ID NO 4, a polypeptide comprising amino acid residues from about 2 to about 21 in SEQ ID NO 6, a polypeptide comprising amino acid residues from about 81 to about 92 in SEQ ID NO 6, and a polypeptide comprising amino acid residues from about 109 to about 127 in SEQ ID NO 6 13 An isolated polypeptide of claim 1 1 , which is produced or contained in a recombinant host cell 14 An isolated polypeptide of claim 13, wherein said recombinant host cell is mammalian 15 An isolated nucleic acid molecule, comprising a polynucleotide encoding a huXAG-l, huXAG-2 or huXAG-3 polypeptide wherein, except for one to fifty conservative amino acid substitutions, said polypeptide has a sequence selected from the group consisting of (a) a nucleotide sequence encoding a polypeptide comprising amino acids from about -20 to about 155 in SEQ ID NO 2, or amino acids from about -23 to about 149 in SEQ ED NO 4, or amino acids from about -23 to about 143 in SEQ ID NO:6, (b) a nucleotide sequence encoding a polypeptide comprising amino acids from about -19 to about 155 in SEQ ID NO 2, or amino acids from about -22 to about 149 in SEQ ID NO 4, or amino acids from about -22 to about 143 in SEQ D NO:6, (c) a nucleotide sequence encoding the polypeptide comprising amino acids from about 1 to about 155 in SEQ ID NO 2, or amino acids from about 1 to about 149 in SEQ ID NO 4 or amino acids from about 1 to about 143 in SEQ ID NO 6, (d) a nucleotide sequence encoding a full-length polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 97641 , or ATCC Deposit No 2091 4 or ATCC Deposit No 209137, (e) a nucleotide sequence encoding a mature polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 97641, or ATCC Deposit No 209134 or ATCC Deposit No 209137, and (f) a nucleotide sequence complementary to any of the nucleotide sequences in (a), (b), (c), (d), or (e) 16 An isolated huXAG-l, huXAG-2 or huXAG-3 polypeptide wherein, except for one to fifty conservative amino acid substitutions, said polypeptide has a sequence selected from the group consisting of (a) amino acids from about -20 to about 155 in SEQ ID NO 2, or amino acids from about -23 to about 149 in SEQ ID NO 4, or amino acids from about -23 to about 143 in SEQ ID NO 6, (b) amino acids from about - 19 to about 155 in SEQ ID NO 2, or amino acids from about -22 to about 149 in SEQ ID NO 4, or amino acids from about -22 to about 143 in SEQ ED NO 6; (c) amino acids from about 1 to about 155 in SEQ ID NO 2, or amino acids from about 1 to about 149 in SEQ ID NO 4, or amino acids from about 1 to about 143 in SEQ ID NO 6, (d) the ammo acid sequence of a full-length polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 97641, or ATCC Deposit No 209134 or ATCC Deposit No 209137, (e) the amino acid sequence of a mature polypeptide having the amino acid sequence encoded by the cDNA clone contained in ATCC Deposit No 97641, or ATCC Deposit No 209134 or ATCC Deposit No 209137, and (f) the amino acid sequence of an epitope-beaπng portion of any one of the polypeptides of (a), (b), (c), (d), or (e) 17 An isolated antibody or antibody fragment that binds specifically to a huXAG-l, huXAG-2 or huXAG-3 polypeptide of claim 1 1 18 A method for treating an individual in need of a decreased level of huXAG-l, huXAG-2 or huXAG-3, comprising administering to said individual a composition comprising the isolated antibody or antibody fragment of claim 17 19 A method for treating an individual in need of an increased level of huXAG-l, huXAG-2 or huXAG-3, compnsing administering to said individual a composition comprising an isolated polypeptide of claim 1 1 20 A diagnostic method comprising (a) measuπng huXAG-l, huXAG-2 or huXAG-3 gene expression level in cells or body fluid of an individual, and (b) comparing the huXAG- 1 , huXAG-2 or huXAG-3 gene expression level of said individual with a standard huXAG-l, huXAG-2 or huXAG-3 gene expression level, whereby an increase or decrease in the huXAG- 1, huXAG-2 or huXAG-3 gene expression level over said standard is indicative of a huXAG-l-, huXAG-2- or huXAG-3 -related disorder 21. A diagnostic method of claim 20, comprising. (a) measuring huXAG-l gene expression level in colorectal cells or body fluid of an individual; and (b) comparing the huXAG-l gene expression level of said individual with a standard huXAG-l gene expression level, whereby an increase in the huXAG-l gene expression level over said standard is indicative of colon cancer. 22 The method of claim 21 , wherein said huXAG-l gene expression level is assayed by detecting mRNA. 23. The method of claim 21, wherein said huXAG-l gene expression level is assayed by detecting huXAG-l protein. 24. The method of claim 23, wherein said protein is detected with an antibody.

Inventors: DILLON PATRICK J, EBNER REINHARD, ENDRESS GREGORY A, YU GUO-LIANG, DILLON, PATRICK, J., EBNER, REINHARD, ENDRESS, GREGORY, A., YU, GUO-LIANG
Applicants: DILLON PATRICK J, EBNER REINHARD, ENDRESS GREGORY A, HUMAN GENOME SCIENCES INC, YU GUO LIANG, DILLON, PATRICK, J., EBNER, REINHARD, ENDRESS, GREGORY, A., HUMAN GENOME SCIENCES, INC., YU, GUO-LIANG
Application year: 1997
Main classification: C07K14
IPC codes: A61K38, C07K14, C12N1