animal experiment animal model nonhuman 891 controlled study 797 article 666 Animals 664 priority journal 613 mouse 609 animal tissue 480 Mice 473 female 417 animal cell 399 male 370 Female 348 Male 295 protein expression 253 rat 235 animal 216 unclassified drug 202 Rats 192 Article 188 human 173 Humans 166 metabolism 163 Mice, Inbred BALB C 162 in vivo study 146 enzyme activity 142 in vitro study 134 cell proliferation 124 Animalia 115