Cytochromes a3

**Definition:** A subclass of heme a containing cytochromes with an alpha-band absorption of 605 nm. They are found in a variety of microorganisms and in eukaryotes as a high-spin cytochrome component of MITOCHONDRIAL ELECTRON TRANSPORT COMPLEX IV.

**Tree numbers:** - D08.244.175.600 - D12.776.422.220.175.600

**Synonyms:** - Cytochrome a(3) - Cytochrome a3 - Ferrocytochrome a3