Ascorbate Glutathione Pathway Encyclopedia MDPI Stable selones in glutathione peroxidase like catalytic cycle of selenonicotinamide derivative Organic & Biomolecular Chemistry (RSC Publishing) The Glutathione System: A Journey from Cyanobacteria to Higher Eukaryotes Antioxidant Potential of Glutathione and Crosstalk with Phytohormones 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