Animals protein expression nonhuman 822 controlled study 692 article 674 priority journal 668 animal cell 486 Mice 446 mouse 404 animal experiment 384 Humans 346 animal tissue 310 human 306 unclassified drug 298 Female 294 animal 292 female 266 metabolism 256 protein function 236 animal model 230 Male 228 male 218 rat 188 Rats 186 signal transduction 186 messenger RNA 170 human cell 156 cell proliferation 142 Article 136 enzyme activity 134