Files in this Data Supplement:

• Supplemental file 1 - Fig. S1 (Maximum-likelihood trees of dnaK, recA, and glnII gene sequences), S2 (Shimodaira-Hasegawa tests of congruence of tree topologies), S3 (Maximum-likelihood phylogenies of nodZ and noeI genes), S4 (ClustalW alignments showing the nucleotide and amino acid sequences of noeI), and S5 (ClustalW alignment of nodA nucleotide sequences)
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