(A) ADP-ribosylation mediates the recruitment of Neil3. GFP-Neil3 was expressed in U2OS cells, and cells were treated with olaparib (1 µM, 1 hour) or mock (0.1 % DMSO in medium, 1 hour). Following laser microirradiation treatment, the recruitment of Neil3 was examined with live-cell imaging at the indicated time points (left panel). The laser stripe is indicated with yellow arrowheads. The relocation kinetics is shown in the right panel. Data represents mean ± SD from three biologically independent experiments (right panel). At least 20 cells were included in each experiment. 