Animals animal cell article priority journal nonhuman 921 controlled study 761 Mice 456 mouse 411 animal experiment 345 protein expression 289 unclassified drug 279 Female 278 Rats 267 animal tissue 266 female 266 rat 239 Humans 234 Male 216 animal model 210 male 207 human 181 Animalia 178 signal transduction 162 animal 153 cell proliferation 146 human cell 132 Cells, Cultured 127 metabolism 127 Rats, Sprague-Dawley 124 messenger RNA 120