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1. (neurotoxicology) 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine: a byproduct of synthetic heroin, or MPPP, which causes parkinsonian symptoms in users; and a neurotoxin that degrades into MPP+ after crossing the blood-brain barrier, which causes a degradation of the dopaminergic neurons within the substantia nigra.