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Quantitative HEp-2 adherence assay. Each bar represents the mean of three independent experiments with standard deviations. The number of microcolonies is indicated by CFU per 106 of HEp-2 cells. Strain: wild type, ST91-1; ΔeibG, ST91-1G; MC4100/vector, MC4100/pGEM-self; MC4100/eibG+, MC4100/pGEMEBG.
