PRNP and Parkinson disease: Oxidative Stress, Reactive Oxygen Species (ROS), Proteinaceous diseases and the proteins related to them: Aβ-amyloid (Alzheimer’s disease, AD), Tau proteins [Alzheimer’s disease and Parkinson’s disease], α-Synuclein (Parkinson’s disease), Prion: PrP (Prion Proteins), Amylin or islet amyloid polypeptide (IAPP) (type II diabetes), α-Crystallins (Cataracts) are briefly presented in [1].