Abstract
Previous work had demonstrated a direct proteolytic activity of human prostatic extract on a substrate of casein but not of fibrinogen or fibrin. In the experiments reported here, with a substrate of fibrin or fibrinogen having a higher concentration and specific activity than in previous experiments, it became possible to demonstrate such a direct proteolytic activity on these substrates. In addition, the presence of a trypsin and plasmin inhibitor in prostatic extract could be demonstrated. By ammonium sulphate fractionation, a fraction can be separated from the extract, containing the factor responsible for the direct proteolytic activity and the inhibitor.
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