A substance occurring in the colostrum from which it is liberated by kallikrein. Colostrokinin lowers blood pressure and contracts the uterus and intestine. Isoln from cow colostrum: Werle, Trautschold, Z. Biol. 112, 169-180 (1960), C.A. 55, 1725 (1961); Yamazaki, Moriya, Biochem. Pharmacol. 18, 2303 (1969). Properties: eidem, ibid. 2313.
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