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SI Figure S4. DSBs caused by sparsely ionizing radiation are resected in G2-phase; more complex DSBs caused by heavy ion radiation are resected in G1 as well. NFFhTERT cells were irradiated and treated as in Figure 3 A. DSB resection (RPA) was analyzed 2 h after irradiation for G1- (CENP-F negative) as well as S/G2-cells (CENP-F positive). Error bars: X-ray experiment: SEM of three independent experiments; carbon ion experiment: binomial error of the mean of one experiment. At least 30 G1 and S/G2 cells were analyzed. The data for X-ray irradiated G1 cells does not show a significant number of RPA positive cells (Fisher's exact test).