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Comparison of γ-H2AX foci developed on embryonic zebrafish (ZF4) cells upon two different treatments: Top row: gamma radiation for 4 h, then partnered them with non-irradiated bystander ZF4 cells for 1 h, and finally irradiated with gamma radiation for another 20 h; bottom row: gamma radiation for 24 h. Treatment in the top row led to significantly fewer γ-H2AX foci than treatment in the bottom row.
