Humans human 1,568 article 1,166 priority journal 1,104 controlled study 1,062 Animals 974 human cell 898 nonhuman 894 unclassified drug 588 metabolism 546 protein expression 516 animal cell 450 Female 430 animal 420 Mice 398 female 368 signal transduction 364 mouse 356 cell proliferation 318 Male 300 Cell Line, Tumor 288 Article 280 male 268 Cell Line 266 Signal Transduction 260 genetics 258 protein function 254 apoptosis 244 physiology 232 animal experiment 230