CAT and diabetes mellitus: In an animal model of diabetes, C. zeylanicum extract (100, 200 and 400 mg/kg) for 14 days significantly reduced latency time and distance in Morris water maze and increased hippocampal cell density and activity of CAT and GPx enzymes in comparison with the STZ group (Edalatmanesh et al., 2018 ▶), which support the preventive effect of this plant on dysregulation of oxidant and antioxidant biomarkers.