A cocktail of four protease inhibitors for the inhibition of serine and cysteine proteases, but not metalloproteases. Each vial, when reconstituted with 1 ml H2O, will yield a 100X stock solution. When diluted to 1X the cocktail contains 500 µM AEBSF, HCl, 150 nM Aprotinin, 1 µM E-64, and 1 µM Leupeptin Hemisulfate. Available as 1 ml or as 1 set of 10 x 1 ml.