Catalysis of methaemoglobin reduction by erythrocyte cytochrome B5 and cytochrome B5 reductase.
D002384:Catalysis; D003580:Cytochromes / Q000378:metabolism*; D004912:Erythrocytes / Q000201:enzymology / Q000378:metabolism*; D006801:Humans; D008706:Methemoglobin / Q000378:metabolism*; D008708:Methemoglobinemia / Q000378:metabolism; D009243:NAD / Q000378:metabolism; D010088:Oxidoreductases / Q000378:metabolism*
D003580:Cytochromes; D009243:NAD; D008706:Methemoglobin; D010088:Oxidoreductases