Rats animal controlled study rat Animals 113 nonhuman 113 metabolism 101 article 79 priority journal 78 animal experiment 70 animal cell 64 physiology 59 drug effect 54 female 45 Female 43 unclassified drug 43 Article 42 Rats, Sprague-Dawley 40 Sprague Dawley rat 40 animal tissue 39 Male 34 male 34 protein expression 33 Humans 29 Rats, Wistar 29 Wistar rat 29 human 29 chemistry 28 animal model 27 drug effects 26