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Cell proliferation and cell cycle distribution of isogenic head and neck squamous cell carcinoma cells. a No difference in cell proliferation of isogenic cells with different radiosensitivity was observed. b Cell cycle phase distribution before irradiation, c 5 h after 5 Gy irradiation, and d 24 h after 5 Gy irradiation. Symbols and bars AM ± SEM from three independent experiments. * indicates significant difference; n.s. – non-significant
