Cytochrome Oxidase Subunit I。

種を分類する場合にミトコンドリアCOIの塩基配列を用いられることがある。

• DNA barcoding in animal species: progress, potential and pitfalls.
  Waugh J
  Bioessays29p188-97(2007 Feb)
• Evolution of the cytochrome c oxidase proton pump.
  Musser SM, Chan SI
  J Mol Evol46p508-20(1998 May)
• Organization and structure of the genes for the cytochrome b/c1 complex in purple photosynthetic bacteria. A phylogenetic study describing the homology of the b/c1 subunits between prokaryotes, mitochondria, and chloroplasts.
  Gabellini N
  J Bioenerg Biomembr20p59-83(1988 Feb)