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Caffeine treatment evicts Rad51 in HeLa cells. (A) Rad51 foci are lost in HeLa cells following caffeine treatment. 30 mM caffeine added to cells 4 h after irradiation (6 Gy). Cells fixed 1 h or after caffeine treatment and immuno-stained with α-Rad51 or α-RPA antibodies. (B) Quantification of Rad51 and RPA foci. **P value < 0.005 Wilcoxon Rank Sum test.
