article metabolism physiology animal 251 Animals 233 nonhuman 172 controlled study 161 priority journal 141 genetics 134 drug effect 128 human 105 Humans 97 animal cell 78 female 76 growth, development and aging 73 chemistry 72 unclassified drug 71 male 68 cytology 66 animal experiment 65 signal transduction 65 Male 64 mouse 64 enzymology 63 rat 63 gene expression regulation 62 Female 61 Rats 61 Mice 60 animal tissue 58