Humans controlled study protein expression protein function human 73 article 67 priority journal 55 Animals 53 nonhuman 50 human cell 49 unclassified drug 45 mouse 38 animal cell 37 metabolism 37 Mice 36 genetics 31 animal 26 Cell Line, Tumor 25 animal experiment 24 protein protein interaction 24 signal transduction 24 Cell Line 23 female 23 Female 21 human tissue 21 animal model 20 cell proliferation 20 Article 18 down regulation 18 Gene Expression Regulation 17