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S. typhimurium MC2 and MC71 have enhanced invasion and intracellular growth capability. (A) Invasion of MDCK cells was performed as described (20). Replication in the spleens of BALB/c (B) or macrophage-like cell line J744-A.1 (C) was followed by comparing the segregation rates of plasmid pHSG412 or pPir as a measure of bacterial cell division.
