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Figure 2: Proposed activation and inactivation routes and metabolites from MPTP and 2-methyl-1,2,3,4-tetrahydro-β-carboline (2-Me-THβC) protoxins resulting from human monoamine oxidase (MAO), heme peroxidases (lactoperoxidase and myeloperoxidase), and human cytochrome P450 2D6.