Research Article

Low Rates of Lateral Gene Transfer among Metabolic Genes Define the Evolving Biogeochemical Niches of Archaea through Deep Time

Figure 3

Cytochrome oxidase in the Crenarchaeota. Phylogenetic trees for (a) cytochrome oxidase subunit I and cytochrome oxidase subunits I+III and (b) cytochrome oxidase subunit II. Putative gene duplication events (e.g., leading to PoxB and PoxH) are indicated using black arrows.
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(a) Cytochrome oxidase I+III, Crenarchaeota
843539.fig.003b
(b) Cytochrome oxidase II, Crenarchaeota