Animals animal cell article priority journal nonhuman 998 controlled study 824 Mice 508 mouse 458 animal experiment 368 protein expression 320 unclassified drug 302 Female 296 Rats 290 animal tissue 286 female 282 rat 258 Humans 256 Male 232 animal model 226 male 222 Animalia 200 human 196 signal transduction 184 animal 170 cell proliferation 160 human cell 144 metabolism 142 Cells, Cultured 134 messenger RNA 134 Rats, Sprague-Dawley 130