... 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 ... solid line), in the presence of 100 lM neurotoxin (ã, dotted line), in the presence of 200 lM neurotoxin ( , dottedline) and in the presence of neurotoxin and 50 lM dopamine (h, dashed line). Modulation ... required for the fibrillation of a-synuclein. For this, a-synuclein was incubated in the presence of MPTP and MPP+along with dopamine. The fibrillation of a-synuclein was monitored by Thioflavin Tfluorescence...