title: Placental transfer model in the pregnant ewe: use of stable isotopes.
mesh_terms: D000818:Animals; D005260:Female; D005333:Fetus / Q000378:metabolism; D007700:Kinetics; D008431:Maternal-Fetal Exchange; D008954:Models, Biological; D010920:Placenta / Q000378:metabolism*; D011247:Pregnancy; D012756:Sheep; D013806:Theophylline / Q000097:blood
chemical_list: D013806:Theophylline; C021183:1,7-dimethylxanthine