It is based on data concerning the reactivities of cytochromes c of various organisms with cytochrome oxidase from a bacterium and from the cow; on the assumption that denitrifying organisms are ...

ubiquinone in green labeled with a Q; cytochrome c reductase in light blue; cytochrome c in dark blue labeled with cytC; cytochrome c oxidase in pink; and the ATP synthase complex in lilac.