animal cell human nonhuman 460 controlled study 384 Animals 362 Humans 346 human cell 338 article 328 priority journal 322 mouse 262 Mice 226 unclassified drug 198 animal 180 protein expression 178 metabolism 156 animal experiment 146 female 128 animal model 116 Article 112 male 102 signal transduction 100 Female 98 Cell Line 88 cell proliferation 86 rat 86 genetics 84 in vitro study 84 animal tissue 80 Rats 76 protein function 76