Animals article 2,255 nonhuman 2,155 animal 1,651 controlled study 1,468 priority journal 1,458 Male 914 Female 891 male 853 animal experiment 843 female 832 animal cell 809 Humans 782 Mice 756 physiology 706 mouse 699 human 665 metabolism 665 animal tissue 607 unclassified drug 594 Argentina 481 Rats 457 protein expression 446 rat 435 genetics 424 Article 398 animal model 378 Animalia 374 signal transduction 274 drug effect 268