Cells were incubated with SN-NPM (0.5 μg/mL SN-38 in 10 μg/mL NPM) or PBS for 24 hrs in 96-well black-wall plate, and treated with or without light. Mitochondria membrane potential and cell membrane integrity were stained with 40 nM of DiOC6(3) (Green, ∆Ψm) and propridium iodide (PI, Red) at 24 hrs later post-light treatment, respectively. Nucleus was counterstained with Hoechst 33342. (L, light treatment; PI, propridium iodide; the sacle bar is 100 μm).