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The level of γH2AX foci (A), 53BP1 foci (B), and co-localized γH2AX/53BP1 foci (C) in the cells thawed with and without DNaseI. Cells were thawed with or without DNase irradiated with doses 0, 5, 10, and 50 cGy and immunostained 30 min, 2 h, and 22 h post-irradiation. Each data point shows the mean value and standard deviation from 3 experiments.
