Phylogenetic tree highlighting the position of Bradyrhizobium sp. Th.b2 (shown in blue print) relative to other type and non-type strains in the Bradyrhizobium genus using a 1,310 bp intragenic sequence of the 16S rRNA gene. Azorhizobium caulinodans ORS 571T sequence was used as an outgroup. All sites were informative and there were no gap-containing sites. Phylogenetic analyses were performed using MEGA, version 5.05 . The tree was built using the maximum likelihood method with the General Time Reversible model. Bootstrap analysis with 500 replicates was performed to assess the support of the clusters. Type strains are indicated with a superscript T. Strains with a genome sequencing project registered in GOLD  have the GOLD ID mentioned after the strain number and are represented in bold, otherwise the NCBI accession number is provided.