Figure 2. Antioxidant enzyme activity in tissues. A, glutathione reductase (GR); B, glutathione peroxidase (GPx); C, superoxide dismutase (SOD); D, catalase (CAT) Values are mean S.D of 10 parallel measurements. * Figure 2 from Oxidative stress in asthma and COPD: antioxidants as a therapeutic strategy. Semantic Scholar Regulation of the Redox Environment IntechOpen Glutathione reductase modulates endogenous oxidative stress and affects growth and virulence in Avibacterium paragallinarum Veterinary Research Springer Nature Link Insights of Antioxidants as Molecules for Drug Discovery