... (C), in the presence of 100 lM 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 ... shows the kinetics of aggregation of a-synuclein in the presence of 100 lm MPTP and the effect of 50 lm dopamine on the aggregation process Dopamine delayed the lag phase of aggregation marginally ... solid line), in the presence of 100 lM neurotoxin ( , dotted line), in the presence of 200 lM neurotoxin ( , dotted line) and in the presence of neurotoxin and 50 lM dopamine (h, dashed line) • 1692...