Figure 1.

Phylogenetic relationships within C. trachomatis. (A) Comparison of tree topologies produced by maximum likelihood analyses of plasmid (right) and full genome (left) sequences. Colours differentiate serotypes, as shown in the key. Branch lengths represent substitutions per site (see scale bar). Breaks in branches are equivalent to 0.4 substitutions per site. Numbers on nodes of plasmid tree represent numbers of SNPs occurring on that branch. Letters a-c indicate clades that are shown in more detail in B-D. (B-D) Detailed views of changes within clades a, b and c. Numbers on nodes represent numbers of SNPs occurring on that branch. Red stars represent deletions and blue stars represent insertions, with numbers inside the stars showing their length in bp.