Re:Re: First line defence antioxidants superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX) anti aging , , Glutathione Peroxidase 2 Recombinant Rabbit Monoclonal Antibody [JE40 HUABIO Glutathione Peroxidase 3 GPX3 Antibody [Unconjugated] (AF4199): Novus Biologicals 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 The glutathione peroxidase Gpx4 prevents lipid peroxidation and ferroptosis to sustain Treg cell activation and suppression of antitumor immunity: Cell Reports Glutathione Pathways