4 aminobutyric acid h 3 4 Cell Membrane 4 animal cell 4 central nervous system 4 drug receptor binding 4 nervous system 4 nonhuman 4 pharmacokinetics 4 priority journal 4 radioisotope 4 synaptosome 4 2 hydroxyestradiol 2 2 hydroxyestrone 2 2 hydroxyestrone h 3 2 4 aminobutyric acid 2 4 aminobutyric acid receptor 2 Adenylate Cyclase 2 Adenylate cyclase 2 Adrenoceptor binding 2 Animal 2 Animals 2 Benzodiazepine binding 2 Binding Sites 2 Binding, Competitive 2 Catecholestrogens 2 Cerebral Cortex 2 Cerebral cortex 2 Circadian Rhythm 2 Dose-Response Relationship, Drug 2 Enzyme Activation 2