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Induction of apoptosis by 3-Gy γ-irradiation in parental A-T cells (AT5BIVA) and A-T cells transfected with antisense hTOP3 vector or sense hTOP3 vector. The numbers of apoptotic cells after irradiation were calculated after subtraction of the corresponding nonirradiated control of each time point and represent the mean values of four independent experiments.
