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After exposure to 0, 2, 4, 6, 8 and 10 Gy X-ray irradiation, cell survival fractions were examined and the survival curves of cells were obtained from data fitting according to the linear quadratic model. Error bars indicate the standard error of the mean of three individual experiments. *P<0.01 vs U87s/Lv-scr or SU-2/Lv-scr. D0 (mean lethal dose) was calculated by the linear quadratic model.
