Thromboplastic Action of Plasma Protease (Tryptase).

Abstract
The natural protease (tryptase) in several plasma protein fractions resembles a weak pancreatic trypsin in its fibrinogenolytic, fibrinolytic and "thromboplastic" effects. These actions are inhibited by crystalline trypsin-inhibitors from pancreas and soybean. The clear demonstration of thromboplastic action in these quantitatively-controlled tests is direct proof of participation of plasma tryptase in the blood-clotting system.