Glutathione System from Cyanobacteria to Higher Eukaryotes Encyclopedia MDPI TJ. Glutathione peroxidase is an important enzyme in cellular antioxidant defense systems, detoxifying peroxides and hydroperoxides. As a component of the glutathione cycle, it protects the liver from reactive oxygen metabolites. Selenocysteine Glutathione Peroxidase: An Antioxidant Enzyme In Health And Disease SciELO Brasil Oxidative stress: molecular perception and transduction of signals triggering antioxidant gene defenses Oxidative stress: molecular perception and transduction of signals triggering antioxidant gene defenses Assay for quantitative determination of glutathione and glutathione disulfide levels using enzymatic recycling method Nature Protocols