Humans animal cell nonhuman unclassified drug Animals 182 controlled study 168 human 153 article 141 priority journal 129 human cell 114 Mice 103 mouse 102 protein expression 84 animal 80 metabolism 68 Cell Line 60 animal experiment 51 female 45 Article 42 animal model 41 signal transduction 41 Female 40 Cercopithecus aethiops 37 chemistry 37 in vitro study 36 cell line 35 cell proliferation 35 in vivo study 33 rat 33 drug effects 32