Animals rat Rats 356 nonhuman 334 article 307 controlled study 268 priority journal 225 animal experiment 207 animal tissue 171 Rats, Sprague-Dawley 144 Female 143 animal 142 animal cell 141 Male 137 female 129 male 123 metabolism 117 Rats, Wistar 110 unclassified drug 108 protein expression 100 animal model 75 enzyme activity 70 physiology 66 Animalia 65 Rattus 63 Humans 62 Article 52 Ovary 49 human 49 mouse 48