<prompt> Which enzyme protects the brain from free radical injury?MyeloperoxidaseSuperoxide dismutaseMAOHydroxylase  <response>: Ref: Robbins Pathology, 9th ed. pg. 48, 80 Antioxidant enzymes include glutathione peroxidase, SOD and catalase. Deficiency of SOF 1 gene may result in motor neuron disorder. 