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Radioresistance in the cells with downregulation of MT-CO1. Cell survival rates were measured at 1, 3, 5, 7, and 9 days after 7-Gy irradiation. The survival rates of MT-CO1-downregulated cells were significantly higher in days 5, 7 and 9 (P<0.001). Error bars represent the standard deviation of the mean. MT-CO1, cytochrome c oxidase 1; RRCs, radioresistant cells.
