PINK1 KO HeLa cells stably expressing ATAD3A-Flag (3A-Flag) or ATAD3B-Flag (3B-Flag) were mixed with control PINK1 KO cells respectively, and incubated for 24 h. Cells were treated with 4 mM 3-NPA (D) or 200 µM H2O2 (F) for 2 h, and then washed with fresh medium and incubated for another 1 h. Cells were fixed and immunostained with anti-8-oxo-dG and anti-Flag antibodies and analyzed by confocal microscopy. 8-oxo-dG fluorescence intensity of cells treated with 3-NPA (E) or H2O2 (G) was quantified by ImageJ software. Data are presented as mean ± SD (n = 3 independent experiments, 20 cells per experiment), statistical significance was assessed by individual two-tailed student's t-test, N.S., not significant, *p < 0.05, **p < 0.01. Scale bar, 10 µm. 