genetics metabolism nonhuman controlled study 305 animal 286 Animals 284 priority journal 261 Article 212 article 170 animal cell 164 unclassified drug 164 mouse 157 human 140 Mice 139 Humans 125 gene expression regulation 118 animal experiment 117 physiology 107 protein expression 107 gene expression 101 female 99 animal tissue 94 messenger RNA 94 chemistry 84 signal transduction 84 Female 83 male 79 protein function 75 animal model 72 Male 69