1. Succinate-coenzyme Q reductase (SDH, EC 188.8.131.52), complex II in electron transport, succinate-ubiquinone oxidoreductase. An enzyme complex of four subunits located in the inner mitochondrial membrane, involved in the tricarboxylic acid cycle and the electron transport chain.
2. Fumarate reductase (fumarate dehydrogenase, EC 184.108.40.206), a bacterial enzyme or a degraded form of the mitochondrial enzyme that oxidizes succinate to fumarate.
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