Figure 2: Cell cycle kinetics after single or cumulative X-rays irradiation. A431 cells receiving 10Gy X-rays dose using either the conventional single dose model (XRSd10Gy) or cumulative 10Gy irradiation by fractionated doses of 2Gy for 5 days (XRCd10Gy). A. Percentage of cells in each phase of the cell cycle. Cell death was higher after single dose when compared to control and after cumulative dose (p<0.001, Kruskall-Wallis test, N = 3). B. Representative FACS cell cycle profile of A431 control cells and A431 cells irradiated with single or cumulative dose.