Definition: The nonapeptide Arg–Pro–Pro–Gly–Phe–Ser–Pro–Phe–Arg, produced from the decapeptide kallidin (bradykininogen) that is produced from α2-globulin by kallikrein, normally present in blood in an inactive form and similar to trypsin in action; bradykinin is one of several plasma kinins, is a potent vasodilator, and is one of the physiologic mediators of anaphylaxis released from cytotropic antibody-coated mast cells following reaction with antigen (allergen) specific for the antibody.
[brady- + G. kineō, to move]
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