“…Caspase‐3 FRET sensor cells were applied to detect apoptosis in our previous studies (Anand et al, ; G. G. Chiew et al, ; Fu et al, ; X. F. Liu, Yu, Dalan, Liu, & Luo, ; Luo et al, ; H. Tian et al, ; Yu, Liu, Chin, Liu, & Luo, ; Zhu et al, ). In this study, we extended its utilization to drug screening by using the net YFP intensity of sensor cells to quantify cell density and proliferation.…”