title: Morphine addiction and withdrawal alters brain peptide concentrations.
mesh_terms: D000818:Animals; D001923:Brain Chemistry; D006728:Hormones / Q000097:blood / Q000378:metabolism; D006801:Humans; D008297:Male; D009021:Morphine Dependence / Q000378:metabolism*; D009496:Neurotensin / Q000378:metabolism; D010455:Peptides / Q000378:metabolism*; D051381:Rats; D013373:Substance P / Q000378:metabolism; D013375:Substance Withdrawal Syndrome / Q000378:metabolism*
chemical_list: D006728:Hormones; D010455:Peptides; D013373:Substance P; D009496:Neurotensin