animal cell nonhuman 1,239 article 911 priority journal 873 controlled study 860 Animals 809 mouse 484 Mice 428 animal experiment 418 rat 344 unclassified drug 341 female 314 Female 294 animal tissue 291 Rats 290 protein expression 283 animal 279 male 276 Animalia 253 Male 247 human 235 animal model 229 Humans 225 metabolism 224 Article 178 human cell 169 Animal 167 signal transduction 157 cell proliferation 150 Support, Non-U.S. Gov't 149