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Effect of dexamethasone and TRAIL on cell viability in A549 cells. A549 cells were treated with control medium, dexamethasone and/or TRAIL for 24 hr followed by the analysis of cell viability by crystal violet assay. In experiments with dexamethasone plus TRAIL, A549 cells were pretreated with dexamethasone for 12 hr before the addition of TRAIL, simultaneously treated with dexamethasone and TRAIL, and posttreated with dexamethasone for 12 hr after the addition of TRAIL
