Figure 4.

Phylogenetic tree and presence/absence chart of genes in pVir plasmids. In the phylogenetic tree, reference pTet plasmids are indicated with a star. Solid lines in the phylogenetic tree indicate distance between plasmids. Dotted lines are for esthetic purposes to aid the interpretation of the figure given the aligned tip labels. In the presence/absence chart, the presence of gene clusters in the plasmid is indicated in dark gray, while the absence of gene clusters is indicated in white; location on the x-axis does not indicate location on the plasmid. The scale bar for the phylogenetic tree indicates the distance in units of nucleotide substitutions per site.