Huntingtin exon 1 fibrils feature an interdigitated β-hairpin-based polyglutamine core. - Hoop CL; Lin HK; Kar K; Magyarfalvi G; Lamley JM; Boatz JC; Mandal A; Lewandowski JR; Wetzel R; van der Wel PC (Proceedings of the National Academy of Sciences of the United States of America, 2016)