Formation of amyloid-like aggregates from glutamine containing repeat peptides. Monomeric KKQ40KK (▪, □) and KK(QA)20KK (•, ○) were incubated in the 10–20 μm range at 37°C in PBS and amyloid formation monitored by the ThT reaction. Monomer alone (○, □), monomeric Q40 peptide plus 10% by weight of (QA)20 aggregate seeds (•), and monomeric (QA)20 peptide plus 10% by weight of Q40 aggregate seeds (▪) are shown.