title: [Endogenous opioid systems].
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism*; D004723:Endorphins / Q000032:analysis / Q000502:physiology*; D004745:Enkephalins / Q000502:physiology; D006801:Humans; D010146:Pain / Q000517:prevention & control; D011498:Protein Precursors / Q000502:physiology; D011957:Receptors, Opioid / Q000502:physiology; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D004745:Enkephalins; D011498:Protein Precursors; D011957:Receptors, Opioid; C029992:proenkephalin; D001615:beta-Endorphin; C033660:preproenkephalin
vernacular_title: Endogenne systemy opioidowe.