nonhuman 1,841 article 1,803 priority journal 1,646 controlled study 1,597 Animals 1,427 protein expression 1,356 human 989 Humans 894 metabolism 811 unclassified drug 772 animal cell 766 gene expression 740 mouse 677 animal experiment 652 Mice 641 genetics 625 female 603 Female 587 gene expression regulation 560 animal 554 animal tissue 532 human cell 511 male 488 signal transduction 488 Article 460 messenger RNA 453 Male 441 protein function 403 physiology 351 animal model 348