title: Differences in negative and positive feedback of gonadal steroids on release of gonadotropins and prolactin in young and old rats.
mesh_terms: D000375:Aging; D000818:Animals; D004971:Estrus; D005246:Feedback; D005260:Female; D012739:Gonadal Steroid Hormones / Q000378:metabolism*; D006065:Gonadotropins, Pituitary / Q000378:metabolism*; D007031:Hypothalamus / Q000502:physiology; D008297:Male; D018377:Neurotransmitter Agents / Q000502:physiology; D010053:Ovary / Q000502:physiology; D011247:Pregnancy; D011388:Prolactin / Q000378:metabolism*; D051381:Rats; D013256:Steroids / Q000378:metabolism*; D013737:Testis / Q000502:physiology
chemical_list: D012739:Gonadal Steroid Hormones; D006065:Gonadotropins, Pituitary; D018377:Neurotransmitter Agents; D013256:Steroids; D011388:Prolactin