title: Biosynthetic origin and receptor conformation of methionine enkephalin.
mesh_terms: D008958:Models, Molecular; D009020:Morphine; D009022:Morphine Derivatives; D009419:Nerve Tissue Proteins; D009842:Oligopeptides; D013329:Structure-Activity Relationship
chemical_list: D009022:Morphine Derivatives; D009419:Nerve Tissue Proteins; D009842:Oligopeptides; D009020:Morphine