title: Maintenance of unimplanted fertilized ova in spayed rats. II. Effects of progesterone therapy and the duration of the delay in implantation.
mesh_terms: D000818:Animals; D002369:Castration; D010064:Embryo Implantation / Q000187:drug effects*; D004970:Estrone / Q000494:pharmacology; D005260:Female; D005306:Fertilization; D010063:Ovum / Q000187:drug effects / Q000502:physiology*; D011374:Progesterone / Q000494:pharmacology*; D051381:Rats
chemical_list: D004970:Estrone; D011374:Progesterone