title: Opioid peptides: search for the precursors.
mesh_terms: D000818:Animals; D004723:Endorphins / Q000096:biosynthesis*; D004745:Enkephalins / Q000096:biosynthesis*; D006801:Humans; D008970:Molecular Weight; D011498:Protein Precursors / Q000378:metabolism*; D014018:Tissue Distribution
chemical_list: D004723:Endorphins; D004745:Enkephalins; D011498:Protein Precursors