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pen·ta·gas·trin .pent-ə-'gas-trən n a pentapeptide C37H49N7O9S that stimulates gastric acid secretion
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pen·ta·gas·trin (pen″tə-gasґtrin) a synthetic pentapeptide consisting of β-alanine and the C-terminal tetrapeptide of gastrin; formerly used in a common gastric function test.Medical dictionary. 2011.