First line defence antioxidants superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX): Their fundamental role in the entire antioxidant defence grid ScienceDirect Superoxide dismutases: Dual roles in controlling ROS damage and regulating ROS signaling Journal of Cell Biology Rockefeller University Press SOD Creative Enzymes Figure 1 from Comparing glutathione peroxidase and glutathione reductase activity and their associations with cardiovascular measures in Africans and Caucasians : the SABPA study Semantic Scholar Full article: Antioxidant Role in Critically Ill Patients with Vasodilatory Shock: Does Glutathione Peroxidase Correlate to Severity of Tissue Hypoxia and Organ Failure