Cytochrome bc1 complex(complex ID) Cytochrome c1 2F ntermembran Rieske iron-sulfur protein space(P side) Cytochrome b Rieske iron Cytochrome c1 sulfur protein Intermembrane Matrix space(P side) 2Fe-2S center Cytochrome b Matrix (N side) (b)Cytochrome bc1 complex (complex III)