article 1,732 nonhuman 1,650 priority journal 1,537 controlled study 1,294 Animals 1,176 human 824 metabolism 763 Humans 746 unclassified drug 678 protein expression 632 animal cell 618 animal experiment 504 animal 492 mouse 460 Article 436 female 434 genetics 430 Mice 426 male 415 Female 405 human cell 400 animal tissue 387 signal transduction 373 Male 366 enzyme activity 352 chemistry 292 rat 291 protein function 288 Rats 268 physiology 264