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The Δtlp2 mutant exhibits no invasion defect (A) and increased intracellular survival (B) in INT 407 human intestinal cells. Bacteria were infected at an MOI of 100 for both invasion (2 h of gentamicin treatment) and intracellular survival assays (24 h of further incubation). Each data point represents the mean ± SE of 3 independent experiments. ∗P ≤ 0.05.
