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Stx2a levels of PA2 after 6 h incubation in CDI setups where PA2 grew on the bottom chamber and LB/non-pathogenic E. coli (ZK1526, C600, and 1.1954) on the top. Error bars report standard error of the mean from three biological replicates. One-way ANOVA was used and groups shared the same letter (a, b) had no significant difference (Tukey's test, p < 0.05).
