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Hybridization ratios of genes in the tca, tcb, tcc, and tcd loci for strains with orally toxic (left) or nontoxic (right) supernatants. Values close to 1.0 predict the conservation of a gene between strains (open bars), and values of <0.5 predict its absence or sequence divergence (shaded bars). Note that tcaA and tcaB are the only genes perfectly correlated with the presence of oral toxicity.
