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Enhanced nitric oxide secretion by cultures of human airway epithelial cells following DE exposure. NHBE cells were pretreated with 20 mM NAC or 1% sorrel followed by a 7-hour 5% DE exposure, and NO2− levels were measured in cell-free supernatant using the Griess reagent. ∗p value < 0.05 compared to DE. ∗∗∗p value < 0.001 compared to media. Data are presented as the mean ± SEM, n = 3.
