Canadian Medical Guide > Chemicals and Drugs > Enzymes and Coenzymes > Cytochromes > Cytochrome a Group > Cytochromes a Terms and Definitions




Cytochromes a

Medical Definition: A subclass of heme a containing cytochromes that have two imidazole nitrogens as axial ligands and an alpha-band absorption of 605 nm. They are found in a variety of microorganisms and in eucaryotes as a low-spin cytochrome component of MITOCHONDRIAL ELECTRON TRANSPORT COMPLEX IV.
CAS Number: 9035-34-1
Previously Indexed: Cytochrome a Group (1994-2003),Cytochromes (1979-1993)

Cytochromes a Medical Definitions and Terms

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