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Single infection of the Caco-2 polarized cell line with wild-type S. Enteritidis Sal18, LS37 (ΔtatB::cat), or LS37 (ΔtatB::cat) complemented with plasmid pLP198 harboring the tatABC genes. The ΔSPI::cat strain was used as a control. The invasiveness of the mutant strains is measured as a percentage of that of the wild-type strain. Each bar corresponds to an average of three experiments performed in triplicate.
