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Medical Definition of Tachykinin
1. Any member of a group of polypeptides, widely scattered in vertebrate and invertebrate tissues, that have in common four of the five terminal amino acids: Phe-Xaa-Gly-Leu-Met-NH2; pharmacologically, they all cause hypotension in mammals, contraction of gut and bladder smooth muscle, and secretion of saliva. Origin: G. Tachys, swift, + kineo, to move, + -in (05 Mar 2000)
Lexicographical Neighbors of Tachykinin
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