title: Pain modulation: opiates and chronic pain.
authors.affiliation: Department of Neurology, University of California, San Francisco 94143.
authors.forename: H L
authors.initials: HL
authors.lastname: Fields
mesh_terms: D000701:Analgesics, Opioid / Q000627:therapeutic use*; D000818:Animals; D001921:Brain / Q000187:drug effects*; D002908:Chronic Disease; D006801:Humans; D009474:Neurons / Q000187:drug effects; D009619:Nociceptors / Q000187:drug effects*; D010146:Pain / Q000188:drug therapy*; D009435:Synaptic Transmission / Q000187:drug effects*
chemical_list: D000701:Analgesics, Opioid