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Halide flux is inhibited by chloride channel blockers in cultured human airway smooth muscle cells. Halide flux was determined by quenching of MQAE fluorescence in the absence or presence of the chloride channel inhibitor 5-nitro-2-(3-phenylpropylamino)benzoic acid (NPPB) in response to 50 mM NaI in immortalized cultured human airway smooth muscle cells (n = 9) (*P ≤ 0.05).
