title: Enkephalins and endorphins: the endogenous opiates.
mesh_terms: D000698:Analgesia; D000818:Animals; D001921:Brain / Q000378:metabolism; D004723:Endorphins / Q000096:biosynthesis / Q000378:metabolism*; D004745:Enkephalins / Q000096:biosynthesis / Q000378:metabolism*; D005260:Female; D006801:Humans; D008297:Male; D009619:Nociceptors / Q000187:drug effects / Q000503:physiopathology; D010146:Pain / Q000503:physiopathology; D011247:Pregnancy; D011957:Receptors, Opioid / Q000378:metabolism*
chemical_list: D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid