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. Author manuscript; available in PMC: 2017 Feb 11.
Published in final edited form as: Nature. 2016 Aug 11;536(7615):179–183. doi: 10.1038/nature19068

Figure 3. Diversity, abundance, and transcription of nitrate reductase enzymes in the OMZ.

Figure 3

a, Phylogenetic reconstruction of NarG sequences identified in the SAR11 SAGs and metagenomic SAR11 contigs (ETNP prefix), along with reference NO3- reductase and NO2- oxidoreductase enzymes. Partial gene sequences (represented with colored pies) were subsequently added to the pre-constructed tree with phylogenetic placement. b, Relative abundance of NarG/NxrA enzymes in OMZ metagenomic datasets. Abundance was normalized to the rpob gene abundance and thus represents genome equivalents, or the portion of OMZ bacterial cells that encode the enzyme. c, Relative expression of NarG/NxrA proteins in the ETNP transcriptomes.