1QO8:
reference: Open conformation of a flavocytochrome c3 fumarate reductase., Bamford V, Dobbin PS, Richardson DJ, Hemmings AM, Nat Struct Biol 1999 Dec;6(12):1104-7. PMID: 10581549

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