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Native lung and lung cultured for 3 days with either liquid or air ventilation. A: Native lung; B: lung cultured for 3 days with ventilation with culture medium; C: lung cultured for 3 days with ventilation with air. Left panels show overall lung structure, including medium-sized airways, wherein scale bars = 500μm; center panels show small airways, with scale bars = 20μm; right panels show distal alveolar structure, with scale bars = 50μm.
