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Genetic (a) and biochemical (b) control of AOX respiration in plants. Genetic control of AOX gene expression likely involves both retrograde signals from the mitochondrion and other cellular signals related to growth, energy metabolism and stress. Biochemical control of the partitioning of electrons to AOX is, at least in part, the result of a feed-forward activation of AOX by upstream carbon (pyruvate) and redox (NAD(P)H) status.
