Benzamil, but not amiloride, increases ASL volume recovery after CS exposure. ASL height was measured by XZ confocal microscopy with time before and after air and CS-exposure in HBECs. 30 min after air or CS, either amiloride, benzamil, or vehicle (perfluorocarbon) was added as indicated. A and B: mean ASL height over time following air or CS and then amiloride, benzamil, or vehicle. All n = 6. Red, benzamil; blue, amiloride; black, vehicle. Data shown as means ± SE. *P < 0.05 different ± CS exposure for any given drug treatment; †P < 0.05 different to CS exposure at any given time point.