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Neighbor-joining tree based on 16S rDNA (1,336 nt) presenting the phylogenetic relationship among the representative strains isolated from faba bean (in bold) and reference strains. Bootstrap values ≥50% are shown on the branches. Genbank accession numbers are in parentheses. Scale bar = 1% substitutions per site. R, Rhizobium; A, Agrobacterium.
