Endogenous opioid peptides--the enkephalins and endorphins.
D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D003461:Crystallography; D004723:Endorphins / Q000378:metabolism / Q000502:physiology*; D004745:Enkephalins / Q000378:metabolism / Q000502:physiology*; D006168:Guinea Pigs; D006706:Homeostasis; D006801:Humans; D051379:Mice; D011618:Psychotic Disorders / Q000378:metabolism; D011817:Rabbits; D051381:Rats; D011957:Receptors, Opioid / Q000378:metabolism; D013329:Structure-Activity Relationship
D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid