title: Precocious shedding of the zona pellucida in rats treated with progesterone.
mesh_terms: D000818:Animals; D010064:Embryo Implantation; D004971:Estrus; D005260:Female; D007279:Injections, Subcutaneous; D010063:Ovum / Q000187:drug effects*; D011247:Pregnancy; D011374:Progesterone / Q000494:pharmacology*; D051381:Rats; D013997:Time Factors; D014626:Vaginal Smears
chemical_list: D011374:Progesterone