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Days 15 (top) and 30 (bottom) histology: A simplified distal architecture was seen in Dex-treated animals at both days. At d15, RA-treated pups had smaller more numerous alveoli, but these changes were no longer seen at d30. Dex + RA treatment resulted in a restitution of septation to near that of saline controls at both days, (all images 100× magnification)
