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The temporal effects of 20 mM NAC on IR-induced DSBs. DSBs were determined by the neutral comet assay (A), 53BP1 foci (B), γH2AX foci (C) and γH2AX fluorescent intensity (D) from 0.5 to 24 h after 2 Gy irradiation. The open and solid bars indicate the data obtained with/without NAC, respectively. *P < 0.05; **P < 0.01.
