2ESX:
reference: Molecular switch for alternative conformations of the HIV-1 V3 region: Implications for phenotype conversion., Rosen O, Sharon M, Quadt-Akabayov SR, Anglister J, Proc Natl Acad Sci U S A. 2006 Sep 11;. PMID: 16966601

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