NADH H+ CoQ 4 H+ NADH Oxidoreductase NAD CoQH2 4 H+ Succinate FAD Succinate Dehydrogenase Fumarate FADH2 FADH2 CoQ Succinate Dehydrogenase FAD CoQH2 CoQH2 2 Cyt C 2 H+ Cytochrome BC Complex CoQ 2 Cyt C 4 H+

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