Cytochrome a Group

**Definition:** Cytochromes (electron-transporting proteins) in which the heme prosthetic group is heme a, i.e., the iron chelate of cytoporphyrin IX. (From Enzyme Nomenclature, 1992, p539)

**Tree numbers:** - D08.244.175 - D12.776.422.220.175

**Synonyms:** - Cytochromes Type a - Cytochromes, Heme a