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Cholecystokinin definition, a hormone secreted by the upper portion of the intestine that stimulates contraction of the gallbladder and increases secretion of pancreatic juice. See more. Dictionary.com
CCK identified at bottom right. Cholecystokinin (CCK or CCK-PZ; from Greek chole, bile; cysto, sac; kinin, move; hence, move the bile-sac (gallbladder)) is a peptide hormone of the gastrointestinal system responsible for stimulating the digestion of fat and protein.CK is composed of varying numbers of amino acids depending on post-translational modification of the CCK gene product, preprocholecystokinin. Thus CCK is actually a family of hormones identified by number of amino acids, e.g., CCK58, CCK33, CCK22 and CCK8.