Abstract: The present invention relates to human Corpuscles of Stannius polypeptides and DNA (RNA) encoding such polypeptides. Also provided is a procedure for producing such polypeptides by recombinant techniques and antagonists against such polypeptides. Also provided are methods of using the polypeptide therapeutically for treating renal, bone and heart diseases and for using the antagonists for treating hypocalcemia and osteoporosis. Also provided is a diagnostic assay to detect mutations in the nucleic acid sequence encoding the polypeptide and for altered concentrations of the polypeptide in a sample derived from a host.