METHOD FOR SEARCHING PHYSIOLOGICALLY ACTIVE SUBSTANCES, PROCESS FOR PRODUCING THESES SUBSTANCES AND DRUGS FOUND BY THE SEARCHING METHOD

摘要

A method for effeciently searching novel physiologically active substances under a certain predictability. This searching method comprises, among receptors of cells producing an antagonist to a substance in vivo or receptors of cells producing an antagonist to the cells per se, finding a receptor having amino acid sequences of two or more sizes by comparing the cDNA sequences of the receptor; and then examining which region in the longer receptor is missed in the shorter receptor by comparing the above cDNA sequences. By using this method, remedies for diabetes comprising a peptide having the amino acid sequence represented by SEQ ID NO:1 or 5, insulin production regulators comprising a peptide having the amino acid sequence represented by SEQ ID NO:2, and gastric secretion inhibitors comprising a peptide having the amino acid sequence represented by SEQ ID NO:3 or 4 are provided.