Definition: A 22-amino acid polypeptide occurring in duodenal mucosa as a controller of normal gastrointestinal motor activity; in minute (ng) doses, it induces powerful motor activity increases in the fundic gland area and antral pouches of the stomach, with an increase in pepsin output from the fundic gland.
[motility + -in]
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Examples: glitazone, GI cocktail, etc.