... 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 lM dopamine ... solubilized by urea.Effect of dopamine on MPTP and MPP+inducedchanges in kinetics of the aggregation of a-synuclein a-Synuclein was incubated in the presence of 100 lm MPTP, along with 50 lm dopamine. ... solid 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...