4BMG:
reference: Thermodynamic origins of protein folding, allostery, and capsid formation in the human hepatitis B virus core protein., Alexander CG, Jurgens MC, Shepherd DA, Freund SM, Ashcroft AE, Ferguson N, Proc Natl Acad Sci U S A. 2013 Jul 3. PMID: 23824290

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