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Proposed model for electron transfer. (A) Proposed electron transfer path. This illustration shows the electron transfer path from ascorbate in the cytoplasm to monodehydroascorbate on the noncytoplasmic side. (B) Proposed mechanism of ascorbate recycling and ascorbate-dependent ferric reduction catalyzed by Cyt b561. The reactions occur on both sides of the membrane, with Cyt b561 catalyzing the transfer of electrons.
