animal cell human nonhuman 438 controlled study 368 Animals 341 Humans 326 human cell 321 article 307 priority journal 306 mouse 249 Mice 213 unclassified drug 188 animal 172 protein expression 165 metabolism 148 animal experiment 140 female 123 Article 112 animal model 112 male 99 signal transduction 95 Female 92 in vitro study 84 Cell Line 83 rat 81 cell proliferation 80 genetics 78 animal tissue 77 Rats 71 Male 70