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The plaque counts (A) for C600 and its ΔbamA derivatives with modified extracellular loops and Stx2a levels (B) after co-culture with E. coli O157:H7 strain PA2. Error bars were standard error of the mean from three biological replicates. One-way ANOVA was used and groups sharing the same letter (a, b, c) had no significant difference (Tukey's test, p < 0.05).
