animal cell animal experiment animal model male nonhuman 150 controlled study 137 Animals 117 priority journal 111 article 110 Male 106 mouse 105 Mice 91 animal tissue 80 protein expression 55 female 46 in vivo study 46 in vitro study 42 rat 41 animal 39 unclassified drug 38 human 37 Article 36 Humans 34 metabolism 32 Rats 31 human cell 29 Female 25 apoptosis 25 cell proliferation 25 Cell Line, Tumor 24