Blend of protease inhibitors optimized for mammalian cells. Contains the following inhibitors: AEBSF HCl (100 mM), Aprotinin (80 μM), Bestatin (5 mM), E-64 (1.5 mM), Leupeptin (2 mM) and Pepstatin (1 mM). Cocktail is provided as 1 ml of 100X concentrate in DMSO.