Whither studies of comparative placental morphology?
D000818:Animals; D002685:Chiroptera / Q000033:anatomy & histology / Q000502:physiology*; D002824:Chorionic Villi / Q000166:cytology; D004717:Endometrium / Q000502:physiology; D004727:Endothelium / Q000502:physiology; D005260:Female; D006801:Humans; D008431:Maternal-Fetal Exchange; D008854:Microscopy, Electron; D010920:Placenta / Q000098:blood supply / Q000502:physiology / Q000648:ultrastructure; D010929:Placentation; D011247:Pregnancy; D012377:Rodentia / Q000033:anatomy & histology / Q000502:physiology*; D014327:Trophoblasts / Q000502:physiology / Q000648:ultrastructure