animal experiment nonhuman 164 protein expression controlled study 158 Animals 140 priority journal 126 article 124 animal tissue 96 mouse 94 animal model 84 animal cell 82 Mice 80 male 78 Female 68 female 66 Male 64 unclassified drug 64 gene expression 58 animal 50 metabolism 50 Humans 48 Gene Expression Regulation 44 cell proliferation 44 human 44 messenger RNA 44 rat 42 Article 40 gene expression regulation 40 immunohistochemistry 40 Rats 38