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. Author manuscript; available in PMC: 2012 Nov 1.
Published in final edited form as: Biochim Biophys Acta. 2011 Jul 1;1807(11):1398–1413. doi: 10.1016/j.bbabio.2011.06.016

Fig. 1.

Fig. 1

Respiratory oxygen reductases. The bd-family is subdivided into the A-subfamily (long Q-loop), B-subfamily (short Q-loop) and the cyanide insensitive oxygen reductases (CIO). These are subdivisions based entirely on spectroscopic and structural observations and are not phylogentically defined clades.