animal cell animal experiment controlled study in vivo study nonhuman 113 Animals 102 animal model 87 priority journal 84 mouse 83 Mice 64 animal 64 in vitro study 63 protein expression 63 male 61 animal tissue 58 Article 56 article 55 human 53 metabolism 52 Humans 49 female 48 Female 44 Male 43 cell proliferation 37 unclassified drug 36 human cell 35 pathology 28 apoptosis 26 genetics 26 Cell Proliferation 24