Quality Control: ScienCell™ Caspase-3 Assay is applied to various concentration of active recombinant human caspase-3 (1.5 units, 5 units and 15 units per 100 μl reaction) with (2×10-3μmol) and without caspase-3 inhibitor, according to Table 1. After incubation at 37 ̊C for 2 hours, absorbance at 405 nm is read. Results show that the OD405 nm increases as the concentration of caspase-3 increases, while 2×10-3 μmol of caspase-3 inhibitor inhibits the activity of up 15 units of caspase-3 effectively, which provides a negative control for the assay (Figure 1).