Animals animal model article nonhuman 268 animal experiment 249 controlled study 244 priority journal 196 mouse 182 Mice 180 animal tissue 144 Female 135 animal cell 129 female 129 Male 111 male 106 protein expression 80 Rats 72 rat 70 Mice, Inbred BALB C 69 Humans 57 unclassified drug 54 Animalia 45 human 45 animal 43 cell proliferation 40 enzyme activity 40 Disease Models, Animal 39 drug effect 39 in vivo study 39 in vitro study 37