Animals animal experiment 88 animal model article in vivo study nonhuman 88 controlled study 80 mouse 78 Mice 76 priority journal 64 animal cell 56 animal tissue 52 in vitro study 48 male 48 protein expression 42 Female 38 Humans 38 Male 34 female 32 human 32 cell proliferation 28 human cell 26 Cell Proliferation 22 Mice, Inbred BALB C 20 animal 20 Cell Line, Tumor 18 Mice, Inbred C57BL 18 Mus 18 apoptosis 18 drug mechanism 18