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ABT-737 restores the radiosensitivity of MDA-MB-231R cells. (A) The colony forming ability of the MDA-MB-231R cells was significantly decreased following 1 μM ABT-737 for 24 hours. (B) Cell viability assays demonstrated that pre-treatment with ABT-737 increases radiation-induced cell death in the MDA-MB-231R cells. *P < 0.05. Columns, mean of three independent experiments; bars, SD.
