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Phylogenetic tree based on nifH sequences for isolates of Venezuelan soybean-nodulating rhizobia. A 750-bp fragment of the nifH gene obtained from α-rhizobia and β-rhizobia isolates and reference strains was analyzed. The numbers at the branch nodes indicate bootstrap values (%) based on a neighbor-joining analysis of 1,000 re-sampled datasets. The scale bar indicates 0.2 changes per site. (B.: Bradyrhizobium).
