Serglycin (SRGN)

Plays a role in formation of mast cell secretory granules and mediates storage of various compounds in secretory vesicles. Required for storage of some proteases in the connective tissue and mucosal mast cells and for storage of granzyme B in T-lymphocytes.

Mediates processing of MMP2. Plays a role in cytotoxic cell granule-mediated apoptosis by forming a complex with granzyme B that's delivered to cells by perforin to cause apoptosis.