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. 2008 Sep 8;8:142. doi: 10.1186/1471-2180-8-142

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Copyright © 2008 Lambert and Smith; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Invasion of CHO-K1 cells by rough S. Typhimurium lacking a functional SPI-1-encoded T3SS. Invasion levels were calculated for rough S. Typhimurium strains with a functional T3SS, CH133 (PagN⁺) and ML133 (PagN^-) and strains without a functional T3SS, ML4 (PagN⁺, InvA^-) and ML3 (PagN^-, InvA^-). Levels were also calculated for ML3 harboring pPagN2.3 or the vector plasmid pBSKII+. Data represents an average of triplicate wells and standard error bars are shown. * indicates statistical significance of P < 0.05.