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Effect of apical xylitol on non-CF and CF ASL Cl− concentration and volume. Isosmotic xylitol or saline (5 μl) was applied to the apical surface. Twenty-four hours later, ASL Cl− concentration (A) and volume (B) were determined. The asterisk indicates a difference between the saline and the xylitol solutions (P < 0.05; n = 15–18) from three CF and three non-CF specimens.
