animal cell controlled study in vitro study nonhuman Animals 184 priority journal 166 article 157 mouse 119 animal experiment 106 Mice 102 female 89 animal 88 in vivo study 83 unclassified drug 82 animal model 80 animal tissue 75 male 75 protein expression 75 human 74 Article 72 Female 69 Humans 68 metabolism 68 Male 52 cell proliferation 49 human cell 46 rat 39 Mice, Inbred BALB C 36 apoptosis 36 pathology 32