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Neighbor-joining phylogenetic tree of C. coli isolates. The optimal tree with the sum of branch length equal to 73,485.2 is shown. The tree is drawn to scale, with branch lengths representing core SNP distances. There were a total of 11,628 core SNP positions in the final dataset. Symbols at the end of tree leaves indicate isolation location and source (see legend). Figure S2 is an alternate rendering of the tree with bootstrap values and additional information.
