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Skeleton phylogenetic tree of the nifH sequences reconstructed with the neighbor-joining method from aligned nifH sequences as shown in Supplementary Figure S1 in the Supplementary Material. Bootstrap values higher than 50% of 100 resamplings are shown near the corresponding nodes. The chlorophyllide reductase iron protein subunit BchX sequences from Rhodobacter capsulatus and Rhodobacter sphaeroides were used as an outgroup.
