priority journal nonhuman 613 article 565 controlled study 533 Animals 461 protein expression 456 human 295 Humans 281 animal cell 269 unclassified drug 247 animal experiment 238 mouse 224 Mice 222 Female 211 female 206 gene expression 200 animal tissue 192 human cell 165 metabolism 160 male 158 signal transduction 151 Male 142 protein function 132 messenger RNA 129 animal 128 animal model 121 Article 120 genetics 113 gene expression regulation 111 rat 110