title: Current views on endogenous ligands for opiate recognition sites.
mesh_terms: D000818:Animals; D002490:Central Nervous System / Q000378:metabolism; D004399:Dynorphins / Q000378:metabolism*; D004723:Endorphins / Q000378:metabolism*; D004745:Enkephalins / Q000378:metabolism*; D006801:Humans; D008024:Ligands; D010525:Peripheral Nerves / Q000378:metabolism; D011600:Psychopharmacology / Q000639:trends*; D011957:Receptors, Opioid / Q000145:classification / Q000378:metabolism*; D014018:Tissue Distribution
chemical_list: D004723:Endorphins; D004745:Enkephalins; D008024:Ligands; D011957:Receptors, Opioid; D004399:Dynorphins