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