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Background: Understanding the networks of selective proteolysis that regulate complex biological systems requires an appreciation of the molecular mechanisms used to maintain substrate specificity. Human plasmin, a serine protease that promotes the dissolution of blood clots and is essential in maintaining normal hemostasis, is usually described as having broad substrate specificity. Recent evidence...
Background: The serine protease prostate-specific antigen (PSA) is a useful clinical marker for prostatic malignancy. PSA is a member of the kallikrein subgroup of the (chymo)trypsin serine protease family, but differs from the prototypical member of this subgroup, tissue kallikrein, in possessing a specificity more similar to that of chymotrypsin than trypsin. We report the use of two strategies,...
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