the primary subsite specificities of human leukocyte elastase , cathepsin g , porcine pancreatic elastase , rat mast cell proteases i and ii , bovine chymotrypsin a alpha , and the protease from strain v-8 of staphylococcus aureus have been mapped with a series of tripeptide thiobenzyl ester substrates of the general formula boc-ala-ala-aa-sbzl , where aa represents one of 13 amino acids .
C0064833
human leukocyte elastase
C0030306
pancreatic elastase