= Solution
Important unlisted candidates include <ATP synthase>, the <mitochondrial phosphate carrier>, and <succinate dehydrogenase> itself, which supplies electrons from <succinate> to <ubiquinone>. Availability or transfer of <ubiquinone> and <cytochrome c>, and associated transport or metabolite constraints, may also need explicit treatment depending on how the pathway is grouped. \b[ATP synthesis, phosphate supply and substrate oxidation have not all been individually represented.] <Respiratory complex I> is absent from the table but is not required for the direct forward route from <succinate> into the <ubiquinone> pool; its omission alone does not account for missing control of that route.
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