title: Opiate receptors and opioid peptides: an overview.
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism; D004285:Dogs; D004723:Endorphins / Q000378:metabolism*; D004745:Enkephalins / Q000378:metabolism; D006168:Guinea Pigs; D009270:Naloxone / Q000378:metabolism; D051381:Rats; D011957:Receptors, Opioid / Q000032:analysis / Q000378:metabolism*
chemical_list: D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid; D009270:Naloxone