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Propranolol completely reverses terbutaline-induced decrease in fractional 3H-GABA release in cultured human airway epithelial (BEAS-2B) cells. Terbutaline (100 μM) treatment decreased fractional 3H-GABA release, and this decrease was completely reversed by co-treatment with propranol. n = 6–8, ***p < 0.001, **p < 0.01
