has subject area 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine Animals Cell Death Dopamine Dopamine Agents Humans Nerve Tissue Proteins Neurons Nitric Oxide Synthase Nitric Oxide Synthase Type I Nitric Oxide Synthase Type II Oxidative Stress Parkinson Disease Parkinson Disease, Secondary Synucleins alpha-Synuclein