Fig. 2. Confocal fluorescence images of cancer cells (A) and normal cells (B) treated with POP (4 μM, 30 min). For the green channel, the emission was collected at 500–540 nm (λ_ex = 488 nm); for the red channel, the emission was collected at 650–700 nm (λ_ex = 561 nm). Scale bar: 50 μm.