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Effect of cfaE3 mutations on the adherence of CFA/I-piliated E. coli to Caco-2 intestinal cells. MC4100 strains expressing CFA/I pili containing CfaE3 (R67A and R181A substitutions) adhere significantly less to Caco-2 cells than do strains expressing pili with the wild-type CfaE subunit. Significant differences in adherence (P < 0.05) are indicated by asterisks.
