The electron transport system (ETS) in the inner mitochondrial membrane.
(A) Electron micrograph of a human cell section showing three mitochondria. (B) Scheme of the protein complexes that form the ETS, showing the mitochondrial membranes in blue and red; NADH dehydrogenase in light green; succinate dehydrogenase in dark green; the complex formed by acyl-CoA dehydrogenase, electron transfer flavoprotein (ETFP), and ETFP-ubiquinone oxidoreductase in yellow and orange; 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. The flux of electrons is represented by red arrows and e-, and the flux of protons is represented by red arrows and H+.
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