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Northern blot of iNOS mRNA expression in RAW264.7 cells 18 h after infection with different strains of Salmonella. Lane 1, control; lane 2, SL1344; lane 3, SB201; lane 4, SB136; lane 5, EE638; lane 6, GG5; lane 7, cytochalasin D-treated (15 μg/ml) cells infected with SL1344; lane 8, cytochalasin D-treated (15 μg/ml) cells. The ethidium bromide-stained 28S rRNA band (EtBr) is shown to indicate the loading of lanes.
