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NodA phylogenetic tree of α- and β-rhizobia. β-Proteobacterial strains are shown in bold. The tree was reconstructed by using a neighbor-joining approach based on a 116-amino-acid sequence alignment. Values along branches indicate bootstrap percentages of >50%, based on 1,000 replicates. nodA sequences for representative sequences are available from GenBank (accession numbers are given in parentheses).
