A custom concentration cocktail of two inhibitors in EDTA which has been optimized for the inhibition of calcium-dependent endopeptidases, trypsin-like serine proteases, papain and cysteine proteases. Each vial contains 0.02 mg/ml antipain, 0.05 mg/ml leupeptin, and 50 mg/ml EDTA in water. Supplied with an informational insert.