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Related to pancreozymin: I cells
a polypeptide hormone secreted in the small intestine, which stimulates gallbladder contraction and secretion of pancreatic enzymes.
cho·le·cys·to·ki·nin (CCK),(kō'lē-sis-tō-kī'nin), [MIM*118440]
A polypeptide hormone (the human peptide has 33 residues) liberated by the upper intestinal mucosa on contact with gastric contents; stimulates contraction of the gallbladder and secretion of pancreatic juice.