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Summary of ROS types and sources, and action point of antioxidants. O2−•, superoxide anion; HO2▪, perhydroxyl radical; ▪OH, hydroxyl radical; H2O2, hydrogen peroxide; HOCl, hypochlorous acid; ONOO−, peroxynitrite; R▪, lipid alkyl radical; RH, lipid; ROO▪, lipid peroxyl radical; ROOH, lipid hydroperoxide; SOD, superoxide dismutase; CAT, catalase and GPX, glutathione peroxidase.
