MAOB and Parkinson disease: The area of the brain preferentially impacted in Parkinson's disease (PD), the substantia nigra (SN), contains high levels of MAO-B positive astrocytes which are themselves somewhat protected against the effects of H2O2 due to the fact that they contain high levels of both GSH and glutathione peroxidase which act in concert to detoxify H2O2 within cells [11]–[15].