5UM8:
reference: Glycine Substitution at Helix-to-Coil Transitions Facilitates the Structural Determination of a Stabilized Subtype C HIV Envelope Glycoprotein., Guenaga J, Garces F, de Val N, Stanfield RL, Dubrovskaya V, Higgins B, Carrette B, Ward AB, Wilson IA, Wyatt RT, Immunity. 2017 May 16;46(5):792-803.e3. doi: 10.1016/j.immuni.2017.04.014. PMID: 28514686

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