Additional file 4.

Pan-genome tree with all bootstrap values. The tree was created based on the presence or absence of 16,373 HGCs in the 186 E. coli genomes. MLST types are annotated to the far right of each genome name. The phylotypes are marked with the colors blue (A), red (B1), purple (B2), green (D), and the Shigella genomes are marked with the color brown. Bootstrap values are annotated at each node as a percentage between 0 and 100.

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Kaas et al. BMC Genomics 2012 13:577   doi:10.1186/1471-2164-13-577