Spontaneous aggregation kinetics of polyGln peptides in PBSA at 37°C monitored by the decrease in soluble peptide concentration (a) and by the increase in ThT fluorescence of the amyloid-like aggregation product (b). PGQ9 (•), Q15PQ26 (○), PGQ9(P1) (⧫), PGQ9(P2) (◊), PGQ9(P1,2) (▪), PGQ9(P2,3) (▴), PGQ9(P2,4) (▵), PGQ9(P3,4) (□).