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  1. (biochemistry) An amine, C5H9N3, formed by decarboxylation of histidine, that causes dilatation of capillaries, contraction of smooth muscle, and stimulation of gastric acid secretion; it is released during allergic reactions.
    • 2001: The intake of food triggers a release of , which activates the acid-secreting cells. " Leslie Iversen, Drugs: A Very Short Introduction (Oxford 2001, p. 46)
    Etymology: From histidine + amine.

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