A cocktail of four protease inhibitors for the inhibition of serine, cysteine, but not metalloproteases. Reconstitute each vial with 1 ml H2O to obtain a 100X stock solution. 1X stock solution contains 500 µM AEBSF, HCl, 150 nM Aprotinin, 1 µM E-64, and 1 µM Leupeptin Hemisulfate. Supplied with a data sheet.