title: The mechanisms of pain and opioid-induced analgesia.
mesh_terms: D000344:Afferent Pathways / Q000187:drug effects / Q000503:physiopathology; D000701:Analgesics, Opioid / Q000627:therapeutic use*; D000818:Animals; D001921:Brain / Q000187:drug effects* / Q000503:physiopathology; D004723:Endorphins / Q000502:physiology; D006801:Humans; D009619:Nociceptors / Q000187:drug effects / Q000503:physiopathology; D010146:Pain / Q000188:drug therapy* / Q000503:physiopathology; D011957:Receptors, Opioid / Q000187:drug effects*; D012701:Serotonin / Q000502:physiology; D013116:Spinal Cord / Q000187:drug effects* / Q000503:physiopathology; D013373:Substance P / Q000502:physiology; D009435:Synaptic Transmission / Q000187:drug effects
chemical_list: D000701:Analgesics, Opioid; D004723:Endorphins; D011957:Receptors, Opioid; D012701:Serotonin; D013373:Substance P