After culturing for overnight, the mouse macrophage cell line J774A.1 (5 × 105 cells/mL) were infected with the BCG or BCG-MSP1C cells (1 × 107 cfu/ml) at a multiplicity of infection (MOI) of 1:20 in complete DMEM at 37°C in the presence of 5% CO2 for 48 h. Cells treated with LPS (100 ng/ml) were used as a positive control while untreated cells were used as a negative control.
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