... line), in the presence of 100 lM neurotoxin (•, dotted line), in the presence of 200 lM neurotoxin ( , dottedline) and in the presence of neurotoxin and 50 lM dopamine (h, dashed line).Modulation ... MPP+(D), in the presence of 200 lM MPP+(E), in the presence of 100 lM MPTP and 50 lM dopamine (F), in the presence of 200 lM MPTP and 50 lM dopamine (G), in the presence of 100 lM MPP+ and 50 ... responsible for the change in the aggregation kinetics of a-synuclein. Thiswill require further experimental proof. The absence of MPTP in the aggregated protein points to an indirect,rather than a direct,...