respiratory system
• mice exhibit impaired alveolarization by 4 weeks of age but not at P3
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• distal airspaces exhibit membrane ruffling and splaying at alveolar epithelial type 1 (AT1)-AT1 cell junctions
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• mice exhibit an alveolar epithelial permeability defect at 4, 12, and 16 weeks of age
• mice show a small, but significant, increase in bronchoalveolar lavage fluid podoplanin at P3 and a larger increase at 4 weeks, indicating alveolar epithelial cell injury in the lung after conversion to air breathing
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• increase in alveolar epithelial type 2 (AT2) cells in the lungs by 4 weeks of age
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