[Electron microscope study on the secretion of the corpus lutem hormone in the chorionic membrane].
D000033:Abortion, Threatened / Q000473:pathology; D004847:Epithelial Cells; D005321:Extraembryonic Membranes / Q000166:cytology*; D005260:Female; D006651:Histocytochemistry; D006801:Humans; D008854:Microscopy, Electron; D011247:Pregnancy; D011374:Progesterone / Q000378:metabolism*
D011374:Progesterone