article 6,344 nonhuman 4,318 priority journal 3,593 Animals 3,310 Argentina 3,275 controlled study 3,020 human 2,141 animal 1,853 Humans 1,753 male 1,604 unclassified drug 1,604 metabolism 1,556 female 1,529 Male 1,524 Female 1,493 animal experiment 1,405 South America 1,250 animal cell 1,246 physiology 1,064 chemistry 993 Article 953 mouse 925 rat 905 genetics 896 Mice 860 animal tissue 836 Rats 791 Animalia 732 protein expression 719 Animal 715