6MDT:
reference: Capturing the inherent structural dynamics of the HIV-1 envelope glycoprotein fusion peptide., Kumar S, Sarkar A, Pugach P, Sanders RW, Moore JP, Ward AB, Wilson IA, Nat Commun. 2019 Feb 15;10(1):763. doi: 10.1038/s41467-019-08738-5. PMID: 30770829

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