title: Studies on the mechanism of nidation. XXVI. Proestrous estrogen as a hormonal parameter of nidation.
mesh_terms: D000818:Animals; D002247:Carbon Isotopes; D010064:Embryo Implantation; D004967:Estrogens / Q000502:physiology*; D004971:Estrus; D005260:Female; D006634:Histamine H1 Antagonists / Q000494:pharmacology*; D011247:Pregnancy; D011270:Pregnancy, Animal; D011555:Pseudopregnancy; D051381:Rats
chemical_list: D002247:Carbon Isotopes; D004967:Estrogens; D006634:Histamine H1 Antagonists