Functional assays: Caspase 3 (active) Red Staining Kit (ab65617) Caspase 3 activity in Jurkat cells (3 x10e5 cells) following 24 hour exposure to 2 uM Camptothecin (ab120115) with or without 50 μM caspase inhibitor Z-VAD(OMe)-FMK (ab120487). Background signal subtracted, duplicates; +/- SD.