Animals animal cell article nonhuman 1,180 controlled study 965 priority journal 923 Mice 572 mouse 523 animal experiment 433 unclassified drug 383 protein expression 364 Female 343 female 329 animal tissue 325 Rats 318 Humans 298 rat 284 animal model 277 Male 262 male 250 human 242 Animalia 234 animal 224 signal transduction 186 metabolism 181 human cell 177 cell proliferation 174 Cells, Cultured 157 Rats, Sprague-Dawley 155 messenger RNA 150