How does acupuncture work?
D015670:Acupuncture Therapy; D000698:Analgesia; D000818:Animals; D004723:Endorphins / Q000502:physiology; D006801:Humans; D009270:Naloxone / Q000494:pharmacology; D011817:Rabbits; D011957:Receptors, Opioid / Q000502:physiology; D012701:Serotonin / Q000502:physiology
D004723:Endorphins; D011957:Receptors, Opioid; D012701:Serotonin; D009270:Naloxone