article 3,290 nonhuman 2,099 priority journal 1,687 Animals 1,648 Argentina 1,492 controlled study 1,432 animal 947 unclassified drug 846 metabolism 845 human 836 Humans 759 male 713 Male 665 female 622 animal experiment 605 Female 604 South America 583 animal cell 559 physiology 557 chemistry 551 genetics 502 mouse 430 Article 418 Mice 413 animal tissue 398 enzyme activity 366 Support, Non-U.S. Gov't 353 Animalia 351 protein expression 350 rat 309