Figure 2.

ML phylogenetic trees of TTSS cluster and of five single operons. The operon referred to each tree is indicated above each image. Groups are numbered from I to IV, and are related to the tree obtained analyzing the entire TTSS cluster. The trees are drawn to scale, with branch lengths measured in the number of substitutions per site. The congruence between trees and data (SH test) is reported in Table 2. “P. savastanoi savastanoi”, “P. savastanoi fraxini” and “P. savastanoi nerii” are strains ITM317, NCPPB1006 and ESC23, respectively. Names of operons are not in italics to differentiate from gene names.