Endorphins and ethics.
D000818:Animals; D001519:Behavior; D032763:Behavior Control; D001921:Brain; D002648:Child; D004723:Endorphins / Q000627:therapeutic use; D004992:Ethics, Medical; D006801:Humans; D010146:Pain / Q000188:drug therapy; D011619:Psychotropic Drugs; D051381:Rats; D012306:Risk; D018570:Risk Assessment