Fluoromethyl ketone (FMK)-derivatized peptides are useful tools for studying caspase activity Used in tissue cultures to inhibit apoptosis at final working concentrations of 50nM to 100μM Regulated by a variety of stimili, including APAF1, CFLAR/FLIP, NOL3/ARC, IAP, BIRC1/NAIP, BIRC2/cIAP-1, BIRC3/cIAP-2, BIRC4/XIAP, BIRC5/Survivin and BIRC7/Livin