Development of the alveolar structure of the fetal rat in late gestation.
D000818:Animals; D002454:Cell Differentiation; D004727:Endothelium / Q000166:cytology; D004847:Epithelial Cells; D005260:Female; D005333:Fetus; D008168:Lung / Q000196:embryology*; D011247:Pregnancy; D051381:Rats; D013997:Time Factors