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The contribution of SO and sulfide quionone oxidoreductase (SQR) to the mitochondrial electron transport chain. One electron is transferred from H2S to coenzyme Q via SQR (3H8L), which is further transferred to cytochrome c via complex III (CIII). Alternatively, two molecules of cytochrome c are reduced by SO (1SOX)‐catalysed oxidation of one molecule sulfite to sulfate.
