title: Reviews of reviews.
mesh_terms: D000818:Animals; D001921:Brain / Q000502:physiology; D003272:Contraceptive Agents, Male; D004723:Endorphins / Q000502:physiology; D004745:Enkephalins / Q000502:physiology; D006801:Humans; D010455:Peptides / Q000502:physiology; D010600:Pharmacology; D011863:Radioimmunoassay; D011955:Receptors, Drug / Q000187:drug effects; D012530:Saxitoxin / Q000494:pharmacology; D013373:Substance P / Q000494:pharmacology; D013569:Synapses / Q000502:physiology; D013779:Tetrodotoxin / Q000494:pharmacology
chemical_list: D003272:Contraceptive Agents, Male; D004723:Endorphins; D004745:Enkephalins; D010455:Peptides; D011955:Receptors, Drug; D013373:Substance P; D012530:Saxitoxin; D013779:Tetrodotoxin