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Changes in lung morphology in newborn PPHN model rat lungs. Lung sections were stained with hematoxylin and eosin, and images were captured under a light microscope; magnification, ×40; scale bar, 50 µm. Representative lung histological sections of the (A) control group and (B) the PPHN group. When compared with the (A) control group, the small pulmonary artery wall was thicker in the (B) PPHN group. PPHN, persistent pulmonary hypertension of the newborn.
