Immunohistochemical localization and biochemical changes in catalase and superoxide dismutase during metamorphosis in the olfactory system of frog Microhyla ornata

► First report on localization of antioxidants in olfactory system of lower vertebrates. ► Fluctuating levels of catalase and SOD activity indicates its role in metamorphosis. ► Enzymes are localized at the cell level in the specific olfactory epithelial cells.