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Heat resistance of L. monocytogenes 568, the treA mutant, and the back-complemented treA mutant. Wild-type strain L. monocytogenes 568 (▴), L. monocytogenes 568/pAM401 (▵), deletion mutant L. monocytogenes 568:ΔTreA (■), and pAM401:TREOP-transformed treA mutant ΔTreA:pAM:TREOP (□), were grown for 16 h at 37°C in BHI broth and subjected to a heat treatment of 52°C. The plot represents the mean survivors from three independent heat trials ± standard errors.
