Control (GFP+) and shATAD3B (GFP-) PINK1 KO HeLa cells were mixed and incubated for 24 h. Cells were then treated with 4 mM 3-NPA (H) or 200 µM H2O2 (J) for 2 h, and washed with fresh medium, and incubated for another 1 h. Cells were fixed and immunostained with anti-8-oxo-dG and DAPI, then analyzed by confocal microscopy. Control or shATAD3B cells are circled by white dashed lines. 8-oxo-dG fluorescence intensity of cells treated with 3-NPA (I) or H2O2 (K) was quantified using ImageJ software. Data are presented as mean ± SD (n = 3 independent experiments, 20 cells per experiment), statistical significance was assessed by two-tailed student's t-test, **p < 0.01. Scale bar, 10 µm. 