3alpha hydroxy 5alpha pregnan 20 one nonhuman 24 Animals 22 unclassified drug 20 Male 18 article 18 controlled study 18 rat 18 4 aminobutyric acid A receptor 16 Receptors, GABA-A 16 male 16 Rats 14 priority journal 14 GABAA receptor 12 Neurosteroids 12 Pregnanolone 12 animal tissue 12 drug receptor binding 12 eltanolone 12 neurosteroid 12 progesterone 12 Progesterone 10 Protein Binding 10 Rats, Sprague-Dawley 10 animal experiment 10 binding affinity 10 drug synthesis 10 5alpha pregnane 3,20 dione 8 Steroids 8 animal 8