Rats rat 162 nonhuman 130 Dose-Response Relationship, Drug 106 animal experiment 98 dose response 98 priority journal 96 article 94 Animals 92 Male 88 Animal 86 animal cell 82 Female 78 controlled study 76 Support, Non-U.S. Gov't 74 Rats, Inbred Strains 60 drug response 52 in vitro study 50 male 46 radioisotope 40 Rats, Sprague-Dawley 38 unclassified drug 38 female 34 animal tissue 32 drug comparison 32 endocrine system 32 animal 26 Castration 24 Estradiol 24 Progesterone 24