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Ultrastructure of alveolar septa in wild type and Cav1−/− lungs. Note absence of caveolae, hypercellularity and septal thickening of Cav1−/− lung (top right) and abundance of caveolae in thin alveolar, and capillary gas exchange cellular membranes of WT mouse lung (top left and bottom). Images courtesy of Oleg Chaga, PhD., University of Illinois-Chicago.
