Animals human nonhuman Humans 810 priority journal 530 controlled study 496 article 484 animal 456 animal cell 362 unclassified drug 348 Mice 344 human cell 332 mouse 328 metabolism 274 protein expression 258 animal experiment 226 Female 218 female 202 Article 194 animal model 162 genetics 158 Male 154 physiology 154 signal transduction 152 male 146 protein function 144 in vitro study 120 animal tissue 118 cell proliferation 116 chemistry 112