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A: This low-magnification SEM map illustrates the defined distal airway levels examined in this study using a microdissected apical lung lobe. B: A high magnification of a distal airway bifurcation (asterisk). The spatial relationship between ciliated and Clara cells is similar at both airway bifurcations and between bifurcations. Scale bars: 1 mm (A); 50 μm (B).
