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Effect of deletion of the perR gene on survival of L. monocytogenes EGDe in vivo. Mice were inoculated intraperitoneally with either the wild type or the mutants, and the numbers of bacteria recovered from the spleen were determined 3 days postinoculation. The error bars indicate the standard deviations from the means (n = 4).An asterisk indicates that the mean is significantly different from the wild-type (Wt) mean (P < 0.05).
