Protease Inhibitor Cocktail III is a specially formulated cocktail of six protease inhibitors with broad specificity for the inhibition of aspartic, cysteine and serine proteases as well as aminopeptidases. Protease Inhibitor Cocktail III ,1ml is recommended for the inhibition of proteases extracted from 20g of tissue. Protease Inhibitor Cocktail III is Recommended for use with mammalian cell and tissue extracts.