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Airway surface liquid (ASL) thickness reduction between 100% and 70% relative humidity scenarios at control (ΔP=0 cmH2O) and 5, 10, 15 and 20 cmH2O for Calu-3 and RPMI 2650 cells. Data are presented as mean±sd, n=3. *: p<0.05; **: p<0.01; ***: p<0.001.
