Animals 98 Humans animal human 98 protein expression controlled study 90 metabolism 90 nonhuman 88 mouse 66 animal cell 64 Mice 62 genetics 60 Article 58 priority journal 56 unclassified drug 56 animal experiment 50 human cell 46 animal model 40 article 40 female 38 protein function 36 Female 34 gene expression regulation 34 pathology 30 signal transduction 30 Cell Line 28 cell line 28 in vivo study 28 Cell Line, Tumor 26 tumor cell line 26