Review of reviews.
D000818:Animals; D000242:Cyclic AMP; D004358:Drug Therapy; D004594:Electrophysiology; D004723:Endorphins; D004745:Enkephalins; D004364:Pharmaceutical Preparations / Q000378:metabolism; D010600:Pharmacology
D004723:Endorphins; D004745:Enkephalins; D004364:Pharmaceutical Preparations; D000242:Cyclic AMP