5CAY:
reference: Structure of an HIV-2 gp120 in complex with CD4., Davenport YW, West AP Jr, Bjorkman PJ, J Virol. 2015 Nov 25. pii: JVI.02678-15. PMID: 26608312

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