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Tryptase (EC 3.4.21.59, ) is the most abundant secretory granule-derived serine proteinase contained in mast cells and has been used as a marker for mast cell activation.
Trypsin is a ~ 23 KDa serine protease that catalyzes the breakdown of peptide bonds containing lysine or arginine residues. Cell culture grade trypsin is produced via extract of pancreases, varies in purity, and contains varying degrees of chymotrypsin.