What is alpha2-antiplasmin (plasmin inhibitor)?

alpha2-antiplasmin is a synonym for plasmin inhibitor, which, as the name implies, is a fast-acting inhibitor of the fibrinolytic system. Plasmin Inhibitor binds with plasmin, forming a stable complex devoid of proteolytic activity. Plasmin inhibitor can also form a reversible complex with the lysine-binding sites of plasminogen, as can histidine-rich glycoprotein (HRG), which has an inhibitory effect on the binding of plasminogen to fibrin.