animal cell nonhuman 523 protein expression controlled study 464 Animals 445 article 420 priority journal 403 mouse 302 Mice 282 animal experiment 239 unclassified drug 193 animal tissue 184 female 179 Humans 169 human 165 animal 160 Female 158 animal model 157 male 147 metabolism 147 messenger RNA 125 human cell 123 Male 119 signal transduction 116 protein function 115 rat 115 cell proliferation 104 Article 98 Rats 94 apoptosis 90