protein expression 504 unclassified drug nonhuman 398 controlled study 364 priority journal 346 article 334 Animals 298 human 244 Humans 228 animal cell 208 protein function 168 mouse 148 animal experiment 146 metabolism 146 Mice 138 human cell 138 Article 116 animal 116 Female 104 signal transduction 104 female 96 enzyme activity 94 messenger RNA 94 animal tissue 92 animal model 80 male 78 gene expression 76 genetics 76 Male 70 Signal Transduction 68