1. Introduction Click to copy section linkSection link copied! Protein aggregation is a fundamental biophysical process, implicated in both functional and disease processes. Among the most striking─and important─classes of protein aggregates are fibrils. Fibrils are highly structured peptide aggregates consisting of repeated patterns of interactions between protein monomers and oligomers. Fibrils are implicated in a wide variety of chronic diseases, (1−3) while also having some functional roles.