4Q8D:
reference: A Fibril-like Assembly of Oligomers of a Peptide Derived from beta-Amyloid., Pham JD, Spencer RK, Chen KH, Nowick JS, J Am Chem Soc. 2014 Jul 28. PMID: 25068693

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).