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The cell viability was measured by the MTT assay. The human lung epithelial cells (A549) were exposed to different concentrations of (A) sodium metabisulfite (SM), (B) propylene glycol (PG), and (C) a mixture of SM and PG for 24 h. The vales are reported as the mean ± SE (Student’s t-test, ∗P < 0.05, ∗∗P < 0.01, and ∗∗∗P < 0.00 vs. control).
