Figure 3.

Phylogenetic analysis of sequenced E. coli strains. Phylogenetic relationships based on seven housekeeping genes (adk, fumC, gyrB, icd, mdh, purA, and recA). Strains cluster into phylogroups; W can be found in group B1, whereas the other three laboratory strains are in group A. Escherichia fergusonii (ATCC 35469) was used as an out-group. The tree shows bootstrap values (percentage per 1000 replicates). The scale bar represents divergence time.

Archer et al. BMC Genomics 2011 12:9   doi:10.1186/1471-2164-12-9
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