3.4.21.34	plasma kallikrein	mast cell granule	-	
3.4.21.39	chymase	mast cell granule	-	
3.4.21.59	Tryptase	mast cell granule	-	
3.4.23.34	cathepsin E	mast cell granule	cathepsin E is located in mast-cell secretory granules in complex with heparin proteoglycans, and has a role in processing of procarboxypeptidase A into active protease