Abstract

An enzyme, thrombokinase, has been partially purified from human plasma. Its defining property is the ability to convert prothrombin to thrombin in the absence of other cofactors. This prothrombin-converting activity is independent of residual thrombin and is inhibited by soybean trypsin inhibitor but not by DFP. Various cofactors (polylysine or calcium alone, or beef serum or phospholipid in the presence of calcium) accelerate the conversion of prothrombin by thrombokinase.

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