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γ-Irradiation induces apoptotic cell death. Cells were exposed to varying doses of γ-irradiation and maintained 24 h under normal culture conditions. Cells were then examined for apoptosis by cytometry with FITC annexin V/PI double staining (n = 6) (A) and cell survival by MTS assay (n = 20) (B). The experiment was repeated three times independently.
