Fig. 6

Intracellular ROS level of HCT116 and RKO cells in four groups. After SDT treatment, the cells were cultured in the dark for additional 2 h before ROS analyses. a Representative fluorescence images of DCF (green), probing intracellular ROS. b Representative histogram of fluorescence intensity of DCF in HCT116 and RKO cells detected by flow cytometry. Scale bar 100 µm