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Sequence diversity of natural hrrP alleles. Neighbor-joining phylogenetic tree constructed using DNA sequences for a subset of sequenced hrrP homologs identified in the USDA Sinorhizobium collection and GenBank for the genera Rhizobium and Sinorhizobium. To help visualize the lack of concordance between the hrrP phylogeny and Sinorhizobium phylogeny, we assigned Sinorhizobium clades (I–XVI) based on the chromosomal phylogeny reported by Van Berkum et al. (24).
