The FRET (Fluorescence-Resonance Energy Transfer) peptide substrates PEPDAB005, PEPDAB008, PEPDAB010, PEPDAB011, PEPDAB013, PEPDAB014 and PEPDAB022, which are based on the cleavage sites in specific proteins known to be processed by different ADAM family members 45 (link), 46 (link), were obtained from BioZyme Inc (Apex, NC). Recombinant ADAM10 and ADAM17 were purchased from R&D Systems (Minneapolis, MN). EDTA-free non-MP protease inhibitor cocktails, tablets and Halt solution, were obtained from Roche Applied Science (Indianapolis, IN) and ThermoFisher Scientific (Pittsburgh, PA), respectively. Trypsin and enzyme-free cell-dissociation solution were obtained from GIBCO-Life Technologies (Grand Island, NY).