Catalysis of methemoglobin reduction.
D000818:Animals; D002417:Cattle; D002942:Circular Dichroism; D003573:Cytochrome b Group / Q000097:blood; D042966:Cytochrome-B(5) Reductase / Q000097:blood*; D015786:Cytochromes b5; D004912:Erythrocytes / Q000378:metabolism*; D006461:Hemolysis; D006801:Humans; D007700:Kinetics; D008706:Methemoglobin / Q000378:metabolism*; D009247:NADH, NADPH Oxidoreductases / Q000097:blood*; D010084:Oxidation-Reduction; D010777:Photochemistry; D011487:Protein Conformation
D003573:Cytochrome b Group; D008706:Methemoglobin; D015786:Cytochromes b5; D009247:NADH, NADPH Oxidoreductases; D042966:Cytochrome-B(5) Reductase