Definition: Cytochromes of the b group that are found bound to cytoplasmic side of ENDOPLASMIC RETICULUM. They serve as electron carrier proteins for a variety of membrane-bound OXYGENASES. They are reduced by the enzyme CYTOCHROME-B(5) REDUCTASE.
spell in titles & translations with lowercase b: cytochrome b5
Other names Cytochrome b 5; Ferricytochrome b5; Cytochrome b5; Cytochrome b-5; Apocytochrome b5