title: [Frequency as the cardinal determinant for electroacupuncture analgesia to be reversed by opioid antagonists].
mesh_terms: D015670:Acupuncture Therapy; D000818:Animals; D004399:Dynorphins / Q000037:antagonists & inhibitors; D004599:Electric Stimulation Therapy; D004723:Endorphins / Q000037:antagonists & inhibitors; D004745:Enkephalins / Q000037:antagonists & inhibitors*; D009270:Naloxone / Q000494:pharmacology*; D009271:Naltrexone / Q000494:pharmacology; D010146:Pain / Q000503:physiopathology; D051381:Rats; D012684:Sensory Thresholds; D004561:Transcutaneous Electric Nerve Stimulation; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009270:Naloxone; D009271:Naltrexone; D001615:beta-Endorphin; D004399:Dynorphins