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Effect of the deletion of sa1804 on the bacterial invasion of the human lung epithelial cell line (A549). Intracellular invasion was calculated as described in Section “Materials and Methods." Data are the means ± SE of the means from at least three repeated experiments. 923: wild type CA-MRSA control; sa1804: sa1804 deletion mutant; sa1804Com: sa1804 complementary strain. The symbol **represents P < 0.01 between wild type control and sa1804 knockout mutant.
