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Quantitative adherence of E. coli XL1-Blue carrying pRpeA (white bars) and E. coli XL1-Blue carrying pUC18 (black bars) to HeLa and HCT-8 cells. Results are expressed as percentages of the original inoculum recovered from quadruplicate wells and are the means for at least four independent experiments. *, adherence significantly greater than that of E. coli XL1-Blue carrying pUC18 (P < 0.05; unpaired, two-tailed t test).
