human nonhuman Humans 1,004 Animals 908 priority journal 816 article 708 controlled study 680 unclassified drug 490 human cell 488 animal 460 animal cell 460 mouse 392 protein expression 360 Mice 348 metabolism 344 Article 310 animal experiment 266 female 258 Female 246 male 232 signal transduction 220 genetics 214 protein function 200 animal model 198 Male 186 physiology 182 review 172 in vitro study 170 chemistry 160 cell proliferation 148