A) Time course of α-syn aggregation monitored by ThT fluorescence in the absence (black) and presence of increasing amounts of Hsc70 (0.7 μM, bleu; 1.4 μM, brown; 3.5 μM, red and 7 μM, violet). The time-dependence of ThT fluorescence was fitted to a sigmoidal growth model as described under « Materials and methods ». Inset: percentage of Inhibition of α-syn aggregation at increasing ratios of [Hsc70]/[α-syn]. This % of inhibition was calculated at 52h taking the fluorescence of -syn in absence of Hsc70 as 0% of aggregation. ThT fluorescence results are the means of three independent experiments. B) AFM images of 70 μM α-syn at 0 h (sample 1), and 52h in presence of 7μM of Hsc70 (sample 2). C) DLS histograms of 70 μM α-syn at 0 h (sample 1) and 52h in presence of 7μM of Hsc70 (sample 2).