Additional file 2.

Two phylogenetic trees for 30 gamma-proteobacteria genomes. (a) The tree is based on 16S rRNA sequences using the NJ method. The 16S rRNA sequences were obtained from the Ribosomal Database Project-II release 9 (RDP) [24]. (b) The tree is based on the number of orthologous OG pairs inferred by the UPGMA method.

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Luo et al. BMC Bioinformatics 2007 8:266   doi:10.1186/1471-2105-8-266