Animals Article animal experiment controlled study nonhuman 322 animal 316 metabolism 226 priority journal 190 animal tissue 184 male 172 mouse 166 Male 150 female 140 Mice 136 animal cell 132 drug effects 132 physiology 132 animal model 126 Female 116 unclassified drug 90 protein expression 88 adult 84 human 78 genetics 76 Humans 74 pathology 72 in vivo study 70 in vitro study 62 rat 50 C57BL mouse 48