animal tissue metabolism nonhuman 315 Animals 303 animal 299 controlled study 288 animal experiment 218 priority journal 205 Article 196 mouse 160 male 144 physiology 140 female 134 Mice 128 animal cell 126 article 117 Male 110 Female 104 unclassified drug 102 genetics 94 animal model 91 drug effects 89 protein expression 80 immunohistochemistry 65 drug effect 63 enzyme activity 63 messenger RNA 61 pathology 61 gene expression 56 rat 56