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S-phase transition is favored by Rad51 depletion. (A) Schematics of the experimental procedure. U20S cells were transfected with siLuc/siRad51 and incubated with BrdU for 15 min just before UV irradiation to mark cells transiting S phase at the time of UV irradiation. (B) Samples were collected at the indicated time points, and the cell cycle profiles were determined by flow cytometry. a.u., arbitrary units.
