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Effects of albuterol, formoterol, and salmeterol on ASP+ uptake into human airway epithelial cells. ASP+ uptake was measured by exposing the cells to 10 μM ASP+ for 15 min in the presence or absence of 0.1 mM and 0.5 mM albuterol (A), formoterol (B), or salmeterol (C) at 37°C. Control was calculated as the temperature-sensitive (saturable) uptake of ASP+. Results represent mean ± SEM (n = 3 or 4 experiments). *P < 0.05 versus control.
