6VAS:
reference: Effects of Single alpha-to-beta Residue Replacements on Recognition of an Extended Segment in a Viral Fusion Protein., Outlaw VK, Kreitler DF, Stelitano D, Porotto M, Moscona A, Gellman SH, ACS Infect Dis. 2020 Aug 14;6(8):2017-2022. doi: 10.1021/acsinfecdis.0c00385., Epub 2020 Jul 27. PMID: 32692914

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