Humans human nonhuman Animals 781 priority journal 580 controlled study 509 article 477 animal 409 unclassified drug 371 human cell 331 animal cell 326 metabolism 308 Mice 288 mouse 281 protein expression 256 Article 229 Female 197 animal experiment 197 female 186 genetics 177 physiology 161 Male 157 signal transduction 153 male 147 chemistry 146 protein function 146 animal model 142 in vitro study 125 cell proliferation 119 review 118