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. 2012 Jan 23;7(1):e30499. doi: 10.1371/journal.pone.0030499

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López-Garrido, Casadesús.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The invasion ratios of epithelial HeLa cells by four Salmonella strains are represented: the wild type (wt), a strain with a deletion of SPI-1 (ΔSPI-1), a strain carrying the P_LtetO -stdEF construction, and a strain carrying the P_LtetO -stdEF ΔstdEF construction. Histograms represent averages and standard deviations of 3 independent experiments. An asterisk indicates a statistically significant difference (P<0.05) compared with the wild type.