animal model nonhuman priority journal animal experiment 613 controlled study 598 article 526 Animals 510 mouse 457 Mice 369 animal tissue 364 animal cell 324 female 303 male 277 Female 254 Male 219 protein expression 200 rat 169 animal 145 Mice, Inbred BALB C 140 unclassified drug 136 Rats 132 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