Proteasome Activity Assay Kit ab107921 takes advantage of the chymotrypsin-like activity, using an AMC-tagged peptide substrate (Proteasome Substrate (Succ-LLVY-AMC in DMSO), which releases free, highly fluorescent AMC (Ex/Em 350/440 nm) in the presence of proteolytic activity.Individual kit components also available for purchase with a minimum order of 20 units. Contact us to discuss your needs.