title: Effects of repeated morphine treatment upon maintenance of pregnancy and fetal development in rats.
mesh_terms: D000818:Animals; D005260:Female; D005333:Fetus / Q000187:drug effects / Q000502:physiology*; D005865:Gestational Age; D006128:Growth / Q000187:drug effects; D009020:Morphine / Q000633:toxicity*; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000187:drug effects*; D011374:Progesterone / Q000494:pharmacology; D051381:Rats
chemical_list: D011374:Progesterone; D009020:Morphine