FIG 3.

Phylogenetic tree showing the relationships of the 12 B. thermosphacta strains and accessory genes present or absent in these strains. The tree is based on alignments of orthologous regions of the genomes and was generated by using an approximated maximum likelihood method. All interior node values are 100 or otherwise as marked and represent local support values from 1,000 bootstrap replicates. The scale bar denotes the number of substitutions per site. Branches that were truncated to aid visualization are marked with //, and the original branch length is indicated above. The four phylogroups of B. thermosphacta strains are represented in colored boxes, with the phylogroup number shown in boldface type at the right of the box. Accessory genes present or absent in strains are shown to the right of the tree, and black boxes represent genes that are present, while white boxes represent the absence of genes from the genome.