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The structure of the potent gastrointestinal hormone cholecystokinin (CCK) acting on the smooth muscle contractility at the level of the gallbladder, upon fat stimulation in food [2, 193].The figure depicts the 8-amino acid C-terminal fragment of cholecystokinin, and also known as CCK-8. From National Center for Biotechnology Information. PubChem Compound Database; CID=9833444, https://pubchem.ncbi.nlm.nih.gov/compound/9833444 (accessed May 12, 2016).
