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.

DUI

D045264 MeSH Browser

CUI

M0027097

Previous indexing

Cytochromes (1979-1993); Cytochrome a Group (1994-2003)

History note

2004; use CYTOCHROME A GROUP 1994-2004, use CYTOCHROME A (NM) 1979-1993

Public note

2004; see CYTOCROME A GROUP 1994-2004; CYTOCHROME A was indexed under CYTOCHROMES 1979-1993