3KXS:
reference: Conformational changes in the hepatitis B virus core protein are consistent with a role for allostery in virus assembly., Packianathan C, Katen SP, Dann CE 3rd, Zlotnick A, J Virol. 2010 Feb;84(3):1607-15. Epub 2009 Nov 25. PMID: 19939922

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