| 5VN3: reference: Open and closed structures reveal allostery and pliability in the HIV-1 envelope spike., Ozorowski G, Pallesen J, de Val N, Lyumkis D, Cottrell CA, Torres JL, Copps J, Stanfield RL, Cupo A, Pugach P, Moore JP, Wilson IA, Ward AB, Nature. 2017 Jul 20;547(7663):360-363. doi: 10.1038/nature23010. Epub 2017 Jul, 12. PMID: 28700571 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).