Animals protein expression nonhuman 771 controlled study 648 priority journal 629 article 620 animal cell 445 Mice 416 mouse 378 animal experiment 368 Humans 327 animal tissue 296 human 289 Female 281 unclassified drug 277 animal 275 female 254 metabolism 240 Male 219 animal model 219 protein function 214 male 208 rat 177 Rats 176 signal transduction 171 messenger RNA 157 human cell 144 Article 136 cell proliferation 132 enzyme activity 125