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Radiation-induced hypoxia. Percent oxygen (O2 saturation, y-axis) is presented as means with standard deviations. Rats had lower percent O2 saturation at 6 weeks after 15 Gy irradiation than unirradiated controls (*P < 0.05 between irradiated and unirradiated, and between irradiated at 5 vs 6 weeks). No difference was observed for results between the irradiated group and controls at 5 weeks. n = number of rats.
