title: Chemistry of opioid peptides.
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D004723:Endorphins / Q000502:physiology; D004745:Enkephalins / Q000502:physiology; D006168:Guinea Pigs; D051379:Mice; D051381:Rats; D011957:Receptors, Opioid / Q000502:physiology; D013329:Structure-Activity Relationship; D009626:Terminology as Topic
chemical_list: D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid