Patent ID: 7977069

Claim:
An isolated DNA selected from the following group consisting of: (i) an isolated DNA consisting of a base sequence encoding a protein consisting of the amino acid sequence represented by SEQ ID NO: 2, 16, or 18, or a complementary strand thereof; and (ii) an isolated DNA comprising the DNA of (i) and encoding a protein having a function equivalent to a function of the protein encoded by the base sequence of the DNA of (i), or a complementary strand thereof, wherein the function of the protein encoded by the base sequence of the DNA of (i) is produced by binding with a peptide selected from (a) cholecystokinin octapeptide sulfated form (CCK-8S) consisting of the amino acid sequence represented by SEQ ID NO:14; or (b) a peptide comprising an addition of one amino acid in the amino acid sequence of CCK-8S and having an effect equivalent to CCK-8S on the function of said protein.