nonhuman article 3,008 priority journal 2,458 controlled study 2,302 Animals 2,155 animal cell 1,239 animal experiment 1,220 unclassified drug 1,052 male 848 animal tissue 836 mouse 832 female 763 animal 745 Male 744 Mice 737 Female 719 human 703 rat 683 Humans 678 Article 653 metabolism 615 Rats 562 protein expression 561 animal model 506 enzyme activity 490 Animalia 488 Support, Non-U.S. Gov't 414 Animal 396 Argentina 377 physiology 359