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Maximum-likelihood phylogram with metadata for 39 multidrug-resistant E. coli ST131 strains. The tree with the highest log likelihood (−14,477.1472) is shown. The tree is drawn to scale, with branch lengths measured in numbers of substitutions per site. The analysis involved 39 nucleotide sequences. All positions containing gaps and missing data were eliminated. The final data set contained 4,015 total positions. Yellow shading, H30Rx isolates; green shading, H30R1 isolates.
