title: Castration, gonadal hormones and Sidman avoidance acquisition.
mesh_terms: D000818:Animals; D001362:Avoidance Learning / Q000187:drug effects / Q000502:physiology*; D002369:Castration; D004597:Electroshock; D004958:Estradiol / Q000494:pharmacology; D012739:Gonadal Steroid Hormones / Q000502:physiology*; D008297:Male; D011374:Progesterone / Q000494:pharmacology; D051381:Rats; D013739:Testosterone / Q000494:pharmacology
chemical_list: D012739:Gonadal Steroid Hormones; D013739:Testosterone; D011374:Progesterone; D004958:Estradiol