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A2780CP cells were infected with dl922-947 (MOI 7.5) and treated with UCN-01 6 hours later. 48 hpi, cells were fixed, stained for expression of γH2AX and Rad51, counterstained with DAPI, and imaged. Original magnification, ×400. The numbers of Rad51-positive (>10 foci) nuclei in 10 fields of view were counted. *P < 0.05, **P < 0.01.
