title: A biological aging test for the central regulation of the estrous cycle in the rat. Its first application.
mesh_terms: D000375:Aging; D000818:Animals; D004967:Estrogens / Q000494:pharmacology*; D004971:Estrus / Q000187:drug effects*; D005260:Female; D011247:Pregnancy; D011555:Pseudopregnancy; D051381:Rats
chemical_list: D004967:Estrogens