2XKS:
reference: Conformational Conversion during Amyloid Formation at Atomic Resolution., Eichner T, Kalverda AP, Thompson GS, Homans SW, Radford SE, Mol Cell. 2011 Jan 21;41(2):161-72. PMID: 21255727

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