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Stx2a levels after co-culture of C600 and commensal 1.1954 expressing heterologous BamA with E. coli O157:H7 strain PA2. ST stands for ΔbamA mutant with heterologous BamA from either S. Typhimurium and EE for ΔbamA mutant with homologous BamA from E. coli. Error bars report 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).
