title: Human placental villi: scanning electron-microscopic observations.
mesh_terms: D005260:Female; D006801:Humans; D006828:Hydatidiform Mole / Q000473:pathology; D008855:Microscopy, Electron, Scanning; D010920:Placenta / Q000166:cytology* / Q000473:pathology; D011247:Pregnancy; D013997:Time Factors