Humans human 2,994 article 2,182 priority journal 1,820 Animals 1,564 controlled study 1,558 nonhuman 1,356 Female 1,036 female 938 Male 914 human cell 898 male 826 metabolism 776 unclassified drug 762 animal 720 adult 692 Adult 600 protein expression 572 Article 488 physiology 488 Mice 474 animal cell 450 genetics 450 mouse 422 Middle Aged 412 signal transduction 410 chemistry 402 Argentina 376 cell proliferation 318 protein function 314