nonhuman 371 priority journal 345 article 328 controlled study 314 Animals 271 human 234 Humans 218 metabolism 171 unclassified drug 171 protein expression 153 animal cell 151 genetics 138 gene expression 132 mouse 131 human cell 126 messenger RNA 124 genetic transcription 123 Article 122 reverse transcription polymerase chain reaction 120 signal transduction 118 animal 117 transcription factor 116 Mice 114 Transcription, Genetic 114 gene expression regulation 108 animal experiment 103 transcription regulation 103 Transcription Factors 90 animal tissue 90 promoter region 89