protein expression article 86 nonhuman 86 priority journal 82 controlled study 80 promoter region 78 Animals 60 animal cell 52 human 52 unclassified drug 50 Humans 42 Mice 40 Promoter Regions, Genetic 40 human cell 38 mouse 38 protein function 32 gene expression 30 signal transduction 30 genetics 28 metabolism 28 Cell Line 24 Promoter Regions (Genetics) 24 animal 24 cell line 24 messenger RNA 24 Protein Binding 22 enzyme activity 22 transcription regulation 22 Article 20 protein analysis 20