Humans human 2,888 article 2,058 priority journal 1,746 Animals 1,494 controlled study 1,477 nonhuman 1,298 Female 1,009 female 916 Male 890 human cell 841 male 804 metabolism 743 unclassified drug 719 animal 699 adult 675 Adult 583 protein expression 541 Article 486 physiology 468 Mice 443 genetics 430 animal cell 422 Middle Aged 402 mouse 397 chemistry 388 signal transduction 384 Argentina 366 cell proliferation 301 protein function 292