1XYR:
reference: The structure of the poliovirus 135S cell entry intermediate at 10-angstrom resolution reveals the location of an externalized polypeptide that binds to membranes., Bubeck D, Filman DJ, Cheng N, Steven AC, Hogle JM, Belnap DM, J Virol 2005 Jun;79(12):7745-55. PMID: 15919927

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