Figure 1.

Phylogeny of the SpoIISA proteins. Neighbor-joining phylogenetic tree based on SpoIISA protein sequences from selected species. Sequences from non-bacillus species are red; those from the B. cereus group are green; and those from the B. subtilis group are blue. The abbreviations are explained in Table S2. The location of a particular SpoIISA coding gene on a plasmid is indicated by a circled P and near a PBSX prophage by a phage icon. Numbers are the bootstrap support for a particular node. The scale bar shows the evolutionary distance in the number of amino acid substitutions per site.