article nonhuman priority journal 698 controlled study 636 Animals 580 animal cell 404 protein expression 314 animal experiment 300 Mice 298 mouse 292 unclassified drug 280 animal tissue 240 Female 210 Humans 202 female 196 gene expression 182 signal transduction 168 rat 166 human 164 male 162 Gene Expression Regulation 156 gene expression regulation 154 Rats 152 messenger RNA 152 animal model 150 Male 142 transcription regulation 142 metabolism 128 enzyme activity 124 RNA, Messenger 120