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Effect of the ETT2 system on growth of E. coli O78-9 in serum. The experiment was conducted as described in the legend to Fig. 5. Cultures of E. coli O78-9 and its mutant deleted for the eprHIJK gene cluster of the ETT2 system were grown in minimal MOPS medium alone (B) or supplemented with 50% serum (A).
