Variation in virulence among clades of Escherichia coli O157:H7 associated with disease outbreaks
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Fig. 2.
The phylogenetic network applied to 48 parsimoniously informative (PI) sites using the Neighbor-net algorithm for 528 E. coli O157 strains. The colored ellipses mark clades supported in the minimum evolution phylogeny. The numbers at the nodes denote the SNP genotypes (SGs) 1–39, and the white circle nodes contain two SGs that match at the 48 PI sites. The seven SGs found among multiple continents are marked with squares.
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PNAS March 25, 2008 vol. 105 no. 12 4868-4873
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