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Composition of alveolar septal walls. Representative electron microscopic images of n = 4–5 animals/group of septal walls illustrating alveolar epithelium (alvepi), extracellular matrix (ECM), collagen fibrils (col; part of ECM), interstitial cells (IC), endothelium (endo), and alveolar airspace (alv). In general, no obvious differences could be observed in most regions, emphasizing the need for stereological analysis. ulv, Unilamelated vecicle.
