Cytochromes b5

**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.

**Tree numbers:** - D08.244.187.500 - D12.776.422.220.187.500

**Synonyms:** - Cytochrome b-5 - Cytochrome b5 - Ferricytochrome b5