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Neighbor-joining phylogenetic tree of amino acid sequences of NarA2 (A) and NarB2 (B) in strain N12. The phylogenetic tree of NarAa is based on a novel RHO classification system that classifies RHOs into five types derived from the ETC components (30). The phylogenetic tree of NarB2 is constructed from homologous sequences aligned by the National Center for Biotechnology Information (NCBI).
