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Neighbor-joining tree based on nodC gene of 13 representative strains (499 nt) (A) and 2 representative strains (230 nt) (B) isolated from faba bean (in bold) and reference strains. Genbank accession numbers are in parentheses. Bootstrap values ≥50% are shown on the branches. Scale bar = 5% substitutions per site. R, Rhizobium.
