Protease Inhibitor Cocktail is supplied as a white lyophilized powder. The cocktail contains the following protease inhibitors, Pepstatin A, Leupeptin, Benzamidine, Na-p-tosyl-L-arginine methyl ester (TAME). At 1X final working concentration the inhibitors are at 1 µM, 1.5 µM, 1 mM and 0.4 mM respectively.