Summary Rabbit platelets contained a proteinase inhibitor which inhibited plasmin, trypsin and chymotrypsin activities, and serum kallikrein to some extent. It did not inhibit pancreatic kallikrein and thrombin. It reacted stoechiometrically with these enzymes in a prompt fashion and was found to have a molecular weight of about 40,000.
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Wakabayashi et al. (1970) studied this question.