<prompt> Enzyme that protects the brain from free radical injury is?MyeloperoxidaseSuperoxide dismutaseMAOHydroxylase  <response>: Ans. b Superoxide dismutaseRef: Robbins pathology 9th ed. I48, 80 Antioxidant enzymes include glutathione peroxidase, SOD and catalase. Deficiency of SOF 1 gene may result in motor neuron disorder. 