The invention relates to a mammalian cell lacking type-1 parathyroid hormone (PTH)/parathyroid hormone-related peptide (PTHrP) receptor (PTH1R) activity and containing carboxyl-terminal parathyroid hormone receptor (CPTHR) activity. The invention also relates to a method of screening for agonists or antagonists for CPTHR.

 
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> PRO1315 polypeptide encoded by a nuclear acid highly expressed in esophageal tumors

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