(D) The recruitment of Neil3 to the oxidative lesions is inhibited by olaparib treatment (1 µM, 1 hour). 0.1 % DMSO in medium for 1 hour as mock. Oxidative damage was induced by KillerRed (KR) system with the exposure to a 15-W SYLVANIA cool white fluorescent bulb for 10 minutes. Scale bar, 2 μm. The foci were indicated with white arrowheads. Right panel: the percentage of Neil3 foci co-localized with KR was quantified. 