Fig. 4

TUNEL analysis of the apoptosis of FaDu cells. a Confocal images of cells under the bright field and TUNEL staining without or with the treatment of different concentration of PDQ. b The percentage of apoptotic cells from TUNEL analysis. Data are shown as mean ± S.D., **p < 0.01, compared to control, n = 3. Scale bars are 50 μm