animal cell human 321 human cell nonhuman 313 controlled study 262 Animals 236 Humans 227 article 222 priority journal 213 mouse 174 Mice 148 unclassified drug 141 protein expression 123 animal experiment 95 animal 91 metabolism 81 animal model 79 female 75 signal transduction 73 Article 70 Cell Line 65 male 63 cell proliferation 57 Female 56 in vitro study 54 rat 54 Cell Line, Tumor 49 Cercopithecus aethiops 49 protein function 48 Male 46