Rats drug effect rat 155 article 147 animal 125 Animals 123 nonhuman 109 metabolism 103 controlled study 86 priority journal 84 animal experiment 74 female 65 Female 61 physiology 61 Rats, Sprague-Dawley 56 animal cell 53 Male 51 male 49 in vitro study 45 unclassified drug 43 Animal 40 animal tissue 34 Sprague Dawley rat 32 human 32 Humans 28 Rats, Wistar 26 Support, Non-U.S. Gov't 26 biosynthesis 25 genetics 25 Animalia 23