article metabolism physiology animal 274 Animals 256 nonhuman 194 controlled study 182 priority journal 160 genetics 158 drug effect 140 human 118 Humans 110 chemistry 86 animal cell 84 female 82 unclassified drug 82 growth, development and aging 80 male 76 signal transduction 76 cytology 74 Male 72 animal experiment 72 enzymology 72 gene expression regulation 72 mouse 72 rat 70 Mice 68 Rats 68 Female 66 Animalia 64