animal tissue nonhuman 836 controlled study 661 article 646 Animals 607 priority journal 590 animal experiment 521 male 386 mouse 325 female 315 animal cell 291 Male 279 Mice 264 animal model 264 rat 250 Female 248 animal 205 Rats 190 protein expression 188 Article 173 metabolism 162 unclassified drug 162 enzyme activity 156 Animalia 149 Rats, Sprague-Dawley 110 physiology 100 messenger RNA 95 immunohistochemistry 90 signal transduction 90 Humans 80