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Succinate dehydrogenase (SDH) complex (simplified). The catalytic subunits SDH subunit A contains the flavin cofactor (FAD) which accepts electrons from succinate and passes them to Fe‐S center in the SDH subunit B subunit. The electrons are then passed the ubiquinone pool embedded in SDHC and SDHD subunits. Reduced Q (QH2 = ubiquinol) transfers electrons within the mitochondrial inner membrane space to complex III [Colour figure can be viewed at http://wileyonlinelibrary.com]
