animal model priority journal nonhuman 666 animal experiment 613 controlled study 602 article 530 Animals 512 mouse 459 Mice 371 animal tissue 364 animal cell 326 female 303 male 277 Female 258 Male 219 protein expression 200 rat 171 animal 145 Mice, Inbred BALB C 140 unclassified drug 136 Rats 134 Humans 127 human 121 Article 116 metabolism 112 in vivo study 104 cell proliferation 98 enzyme activity 97 in vitro study 93 Disease Models, Animal 81