Humans human human cell nonhuman controlled study 308 Animals 298 article 264 animal cell 242 priority journal 224 unclassified drug 186 Mice 174 mouse 172 protein expression 132 animal experiment 118 animal 110 metabolism 102 Cell Line 94 animal model 90 Cell Line, Tumor 86 female 78 male 76 in vitro study 74 Article 72 Male 72 cell proliferation 72 Female 70 in vivo study 68 signal transduction 62 protein function 58 Rats 56