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Effect of the expression of the L. interrogans ChpK in the presence or absence of ChpI on growth of E. coli cells harboring pET30a (filled square), pTAK (chpK with an AUG start codon) (open circles), pTGK (chpK with a GUG start codon) (open squares), and pTAKI (chpK and chpI) (open triangles) in LB liquid media. Growth was determined by measuring the optical density at 600 nm.
