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Effects of X-ray irradiation on cell-cycle progression and apoptosis of hPMSCs. Cells were irradiated with X-rays for the times indicated, and cell-cycle progression and apoptosis were analyzed by flow cytometry. (A) Representative cell-cycle profile of hPMSCs. (B) Cytograms of hPMSCs apoptosis assays. (C, D) Quantitative analyses of the FACS data. Data are presented as means ± SD of triplicate experiments; *P < 0.05, **P < 0.01.
