title: Long-term morphine treatment decreases endorphin levels in rat brain and pituitary.
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000378:metabolism; D000818:Animals; D001921:Brain / Q000187:drug effects / Q000378:metabolism*; D003342:Corpus Striatum / Q000378:metabolism; D004723:Endorphins / Q000378:metabolism*; D004745:Enkephalins / Q000378:metabolism; D007031:Hypothalamus / Q000378:metabolism; D008297:Male; D009074:Melanocyte-Stimulating Hormones / Q000378:metabolism; D008636:Mesencephalon / Q000378:metabolism; D009020:Morphine / Q000494:pharmacology*; D010902:Pituitary Gland / Q000187:drug effects / Q000378:metabolism*; D051381:Rats; D012688:Septum Pellucidum / Q000378:metabolism
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009020:Morphine; D000324:Adrenocorticotropic Hormone; D009074:Melanocyte-Stimulating Hormones