title: Enkephalins and endorphins: a major discovery.
mesh_terms: D001923:Brain Chemistry; D006801:Humans; D009419:Nerve Tissue Proteins / Q000378:metabolism; D010455:Peptides / Q000378:metabolism*; D011957:Receptors, Opioid
chemical_list: D009419:Nerve Tissue Proteins; D010455:Peptides; D011957:Receptors, Opioid