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Immunofluorescence imaging of γH2AX and 53BP1 foci in K562 cells treated with 0.5 nM 1. Rows (top to bottom): γH2AX (green), 53BP1 (red), DNA (blue), and merge. Columns (left to right): control, 0.5, 2, 4, 8, 16, and 24 h after addition.