Abstract
Kallikrein inhibitor from bovine lung was tested as an inhibitor of plant, animal and bacterial proteinases. Apart from those enzymes already known to be inhibited, i.e., kallikrein, trypsin, chymotrypsin, plasmin and pronase, no further susceptible proteinases were found. None of the enzymes tested was able to degrade the kallikrein inhibitor from bovine lung.