CAT and Alzheimer disease: While differences in the activity of superoxide dismutase (SOD), glutathione peroxidase (GPx), 8-oxyguanine DNA glycosylase-1 (OGG1), and catalase (CAT), and levels of glutathione (GSH) and total antioxidant capacity (TAC) may indicate decreased activity of antioxidant enzyme systems among AD patients [151,152,153].