| 2WDQ: reference: Structure of Escherichia coli succinate:quinone oxidoreductase with an occupied and empty quinone-binding site., Ruprecht J, Yankovskaya V, Maklashina E, Iwata S, Cecchini G, J Biol Chem. 2009 Aug 25. PMID: 19710024 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).