Animals Rats animal rat 230 metabolism 173 nonhuman 153 article 140 controlled study 113 physiology 101 priority journal 96 drug effect 89 animal cell 80 animal experiment 74 Male 64 female 64 male 64 Article 60 human 60 Rats, Sprague-Dawley 59 Sprague Dawley rat 59 unclassified drug 59 Female 58 Humans 58 Rats, Wistar 49 Wistar rat 49 animal tissue 46 chemistry 46 genetics 46 mouse 40 Mice 38