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Photomicrographs (×10, upper panel; ×20 lower panel; hematoxylin and eosin stain) of neonatal lung injury noted in newborn mice at postnatal day 2, after 100% O2 exposure since birth. Note the alveolar exudates and presence of inflammatory cells in the hyperoxia-exposed lungs compared with litter-mate controls in room air. RA, room air; HYP, hyperoxia [with permission from Semin Fetal Neonatal Med (2010) 15(4):223–9].
