animal experiment controlled study nonhuman article 646 Animals 632 priority journal 593 animal tissue 424 male 424 animal model 380 mouse 376 female 366 Male 327 animal cell 309 Female 293 Mice 290 rat 252 animal 233 Article 206 protein expression 205 Rats 196 metabolism 175 unclassified drug 172 enzyme activity 130 Animalia 120 Humans 119 human 114 Rats, Sprague-Dawley 107 physiology 105 in vivo study 98 in vitro study 91