title: Surface ultrastructure of human amnion and chorion in early pregnancy: a scanning electron microscope study.
mesh_terms: D000029:Abortion, Legal; D000650:Amnion / Q000166:cytology*; D005321:Extraembryonic Membranes / Q000166:cytology*; D005260:Female; D005865:Gestational Age; D006801:Humans; D008855:Microscopy, Electron, Scanning; D011247:Pregnancy; D013499:Surface Properties