title: Shedding of the zona pellucida in normal pregnancy and in various hormonal states in the mouse. A scanning electron microscope study.
mesh_terms: D000818:Animals; D002369:Castration; D010064:Embryo Implantation; D004967:Estrogens / Q000494:pharmacology; D005260:Female; D005865:Gestational Age; D051379:Mice; D008815:Mice, Inbred Strains; D008855:Microscopy, Electron, Scanning; D010063:Ovum / Q000166:cytology* / Q000187:drug effects; D011247:Pregnancy; D011270:Pregnancy, Animal
chemical_list: D004967:Estrogens