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Binding of Y. pestis usher deletion mutants to HEp-2 cells. HEp-2 cells were infected with KIM6+ WT, usher deletion mutants, or complemented strains as described in Fig. 4. The results (bacteria/cell) were calculated from three independent experiments with three replicates per experiment. Bars represent means ± the SEM (*, P < 0.05 [for comparison of each strain with the WT]).
