4U9Q:
reference: Structure of the V. cholerae Na+-pumping NADH:quinone oxidoreductase., Steuber J, Vohl G, Casutt MS, Vorburger T, Diederichs K, Fritz G, Nature. 2014 Dec 4;516(7529):62-7. doi: 10.1038/nature14003. PMID: 25471880

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