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)

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