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Invasion of THP-1 cells by non-opsonized Salmonella Typhimurium strains. Time-points of 1, 2.5, 4, and 6 h post-infection are shown. The X-axis represents time (h) while the Y-axis represents average colony forming units (CFU) of bacteria per viable THP-1 cell. The different Salmonella strains are color-coded according to the legend.
