title: [Endogenous morphine-like substances and their analgesic mechanism (1) (author's transl)].
mesh_terms: D000700:Analgesics; D000818:Animals; D001921:Brain / Q000378:metabolism; D001923:Brain Chemistry; D004723:Endorphins / Q000378:metabolism / Q000502:physiology*; D004745:Enkephalins / Q000032:analysis / Q000378:metabolism / Q000502:physiology; D006168:Guinea Pigs; D000882:Haplorhini; D006801:Humans; D051379:Mice; D008968:Molecular Conformation; D051381:Rats; D011957:Receptors, Opioid / Q000502:physiology; D013329:Structure-Activity Relationship
chemical_list: D000700:Analgesics; D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid