Compressed subtree sequenced data for pmrA gene of 8 subspecies of Enterobacteriaceae based upon Neighbor-Joining method []. Subtrees presented in Figure 2 are compressed into black triangle. The numbers at the nodes indicate the levels of bootstrap support based on a Neighbor-Joining analysis of 500 resampled data sets. The evolutionary distances were computed using the Maximum Composite Likelihood method  and are in the units of the number of base substitutions per site. The generation of tree was conducted in MEGA5 .