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PpIX (protoporphyrin IX) enhanced ROS generation by X-ray irradiation. (A) •OH measured by 3′-(p-aminophenyl) fluorescein (APF). Ethanol was used as a scavenger for •OH. (B) O2•- measured by dihydroethidium (DHE). Superoxide dismutase (SOD) was used as a scavenger for O2•-. (Data given with n = 4, *: p < 0.01 in a one-way ANOVA and Tukey post-test)
