article 5,760 nonhuman 3,941 priority journal 3,315 Animals 2,999 Argentina 2,887 controlled study 2,758 human 1,975 animal 1,706 Humans 1,588 male 1,499 unclassified drug 1,463 female 1,445 Male 1,429 Female 1,410 metabolism 1,409 animal experiment 1,326 animal cell 1,124 South America 1,121 physiology 959 Article 948 chemistry 923 rat 860 mouse 817 genetics 801 animal tissue 774 Mice 748 Rats 746 Animal 697 Support, Non-U.S. Gov't 683 Animalia 665