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doi:10.22074/cellj.2016.4872 Bauer IE, Green C, Colpo GD, et al

The latter transfers electrons to cytochrome b and then to c (cytochrome oxidase), which accumulates electrons and then passes them to O2, reducing it to H2O

Diabetic Kidney Disease: Challenges, Progress, and Possibilities

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Thus the redox potential differs between subcellular compartments
