2WDV:
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).