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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.
Structure Tryptophan is an amino acid of aromatic group of an indole group bonded to a methylene group as the side chain, which is of two aromatic rings of nitrogen and hydrogen group and is hydrophilic. One of the side chains is 5-membered while the other is 6, and 2 carbons are shared by both aromatic rings.