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The metabolic pathway of cytochrome b5 reductase. Cytochrome b5 reductase catalyzes reduction of cytochrome b5 through transfer of electrons from NADH. Cytochrome b5 in turn catalyzes reduction of methemoglobin into hemoglobin. NADH: Nicotinamide Adenine Dinucleotide, reduced form; NAD+: Nicotinamide Adenine Dinucleotide, oxidized form.
