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Distribution of YE1820 among Y. enterocolitica strains. A parsimony-based gene analysis for determining the distribution of individual CDS YE1820 throughout the phylogenetic tree is shown. Strains from which YE1820 is absent are yellow, and strains in which YE1820 is present are blue. Strains in the low-pathogenicity clade and the high-pathogenicity clade all contain YE1820. YE1820 is absent from strains in the nonpathogenic clade.
