2WS9:
reference: Equine rhinitis A virus and its low pH empty particle: clues towards an aphthovirus entry mechanism?, Tuthill TJ, Harlos K, Walter TS, Knowles NJ, Groppelli E, Rowlands DJ, Stuart DI, Fry EE, PLoS Pathog. 2009 Oct;5(10):e1000620. Epub 2009 Oct 9. PMID: 19816570

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