About the Cover
Cover picture: Airway surface liquid (ASL) volume (height) is determined by the mass of NaCl on airway surfaces. Left-hand panels show XZ-scanning confocal micrographs of ASL (red) immediately after H2O addition (top) and when the ASL has become isoosmotic with the serosal bath solution (bottom). Righthand panels show TEMs of upright cilia/ASL after isotonic volume addition (top) and bent-over cilia after H2O addition. See related article by Tarran, R., and B.R. Grubb, J.T. Gatzy, C.W. Davis, and R.C. Boucher in this issue, pp. 223-236.
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