The respiratory chain of Hydrogenomonas H16 is shown to consist of two pathways, one of which has as its oxidase and only cytochrome a high-potential b-type cytochrome which is concluded to be cytochrome o. The Km values for the oxygen of the two pathways are consistent with the high-potential b-type cytochrome functioning as a relatively high-affinity oxidase.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1186476PMC
http://dx.doi.org/10.1042/bj1780015DOI Listing

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