... 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 and50 lM dopamine (h, dashed line).Modulation ... Nota-bly, in the presence of the neurotoxin, there was adelay in the lag time for fibrillation. The lag timeincreased from 74.9 h in case of a -synuclein alone to86.8 and 93.6 h in the presence of ... 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...