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(A) Section in the lung of a control rat showing two bronchioles (b), alveoli (a), alveolar sacs (S) and a vessel (v) (H&E, ×100). (B) Section in the lung of a control rat showing alveoli (a) and alveolar sacs (S) lined by multiple cells exhibiting flat nuclei (arrows). Note alveolar septa (I) (H&E, ×400).
