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Morphometric analysis of the remodeling of the rat pulmonary epithelium during early postnatal development

In the rat lung the alveoli are formed in the early postnatal period. Within 3 weeks the alveolar surface area increases more than five‐fold and the saccular lung reaches its mature structure. In order to analyse the changes in the compartments of the parenchymal tissue, the lungs of three animals per group aged 4, 13, and 21 days, respectively, were investigated by means of electron microscopic morphometry.