Male article nonhuman Animals 397 male 365 controlled study 340 priority journal 328 animal experiment 304 animal tissue 207 Female 180 Rats 153 Mice 151 female 150 mouse 147 rat 147 animal cell 144 animal model 118 Animalia 99 unclassified drug 79 protein expression 77 Rats, Sprague-Dawley 74 Animal 64 Humans 63 animal 58 Support, Non-U.S. Gov't 55 enzyme activity 55 human 51 Time Factors 50 Liver 46 Argentina 45