Fig. 3. Confocal images of HeLa cells after incubation with TPE–DOX with different treatment; (A–D) no more treatment; (E–H) cells treated with PMA for 30 min and incubated for another 2.5 hour; (I–L) cell treated with PMA for 30 min and incubated for another 5.5 hour. Blue channel: excitation wavelength: 405 nm; collection wavelength: 420–540; red channel: excitation wavelength: 488 nm; collection wavelength: 550–650 nm. All images share the same scale bar (20 mm).