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Video 313–1 Initial video sequences describe establishment of the normal periciliary fluid layer bathing the surface airway epithelium, with spheres representing chloride and bicarbonate ions secreted through CFTR and across the apical (mucosal) respiratory surface. Later video sequences depict failure of CFTR anion transport and resulting depletion of the periciliary layer, “plastering” of cilia against the mucosal surface, and accumulation of mucus in the airway with resulting bacterial infection.

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