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Definition of 1-methyl-4-phenylpyridinium
1. Noun. (organic compound) MPP+, the active metabolite of MPTP. ¹
2. Noun. (neurotoxin) A neurotoxin that cannot cross the blood-brain barrier but which, once in contact, can destroy the dopaminergic neurons of the substantia nigra. ¹
¹ Source: wiktionary.com