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Curcumin was nontoxic to BEAS-2B cells. shRNA-transfected or nontransfected BEAS-2B cells were treated with DMSO, curcumin (5 μM), and IL-4 for 24 h. MTT assay was performed to assess the cell viability of BEAS-2B cells. Quantitative data were presented as mean ± SEM (n = 5). ∗P < 0.05 compared with control.
