3IYJ:
reference: Subunit interactions in bovine papillomavirus., Wolf M, Garcea RL, Grigorieff N, Harrison SC, Proc Natl Acad Sci U S A. 2010 Apr 6;107(14):6298-303. Epub 2010 Mar 22. PMID: 20308582

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