animal model controlled study priority journal nonhuman 598 animal experiment 559 article 484 Animals 470 mouse 423 Mice 341 animal tissue 340 animal cell 297 female 292 male 258 Female 236 Male 196 protein expression 194 rat 147 animal 135 Mice, Inbred BALB C 127 unclassified drug 124 Humans 123 human 115 Rats 114 Article 110 metabolism 110 in vivo study 97 cell proliferation 94 enzyme activity 88 in vitro study 88 Mice, Inbred C57BL 76