title: Proceedings: Two theories: the preimplantation embryo is a source of steroid hormones controlling (1) morula-blastocyst transformation and (2) implantation.
mesh_terms: D000818:Animals; D001755:Blastocyst; D010064:Embryo Implantation; D004967:Estrogens / Q000096:biosynthesis; D005260:Female; D006651:Histocytochemistry; D006913:Hydroxysteroid Dehydrogenases / Q000378:metabolism*; D010063:Ovum / Q000201:enzymology*; D011374:Progesterone / Q000096:biosynthesis; D051381:Rats; D013997:Time Factors
chemical_list: D004967:Estrogens; D011374:Progesterone; D006913:Hydroxysteroid Dehydrogenases