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An imaging phantom was created by adding H2O2 to egg white samples, which continuously produce ROS for several hours (a) due to Fenton reactions (b) catalyzed by ferrous and ferric ions. (c) The production of hydroxyl ROS was confirmed using a radical-activated fluorescent dye, which showed that the ROS produced by the egg white samples is linearly proportional to the H2O2 treatment concentration.
