Recent advances in research on pain and analgesia.
D000698:Analgesia; D000818:Animals; D004723:Endorphins / Q000502:physiology*; D006801:Humans; D009294:Narcotics / Q000627:therapeutic use; D010146:Pain / Q000503:physiopathology*; D011957:Receptors, Opioid / Q000502:physiology
D004723:Endorphins; D009294:Narcotics; D011957:Receptors, Opioid