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Activation of human plasminogen by streptokinase: new aspects of fibrinolysis regulation.

It is established fact, that SK-initiated fibrinolysis is decelerated, when oxygen is removed from solutions; that SK possesses superoxide dismutase-like activity and that its activating function is sharply inhibited by superoxide radical scavengers. The point in discussion is the possibility of oxygen-dependent Pg activation, which is not related to functions of serine proteinase-like activators. The realization of oxygen-radical mechanisms is supposed to depend on activation of zymogens of other serine proteinases and proteinase reactions effect.