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Invasion of HT-29 cells by S. Typhimurium SL1344 and a pagN mutant. Invasion levels were calculated for wild-type S. Typhimurium strain SL1344 and pagN mutant derivative ML6. Levels were also calculated for strain ML6 harboring pML10 (PagN+) or the vector control pBR322. Data represents an average of triplicate wells.
