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Number of 53BP1 foci/cell nucleus in 2 Gy, RE and EBSS RE groups of HeLa cells at 4 and 18 h post irradiation. Independent experiments were performed in triplicate and repeated three times. Data were analyzed using one-way ANOVA followed by post-hoc t-tests. *P < 0.05, **P < 0.01 and error bars represent ± SEM.
