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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.
The serrapeptase enzyme has a molecular weight of 45,000-60,000Da (50.6kDa reported elsewhere) and is comprised of 470 amino acids in length; it is classified as a metalloprotease due to containing a zinc molecule which helps catalyze its enzymatic activity.