animal article metabolism nonhuman Animals 300 controlled study 243 priority journal 216 animal cell 199 physiology 141 mouse 134 Mice 130 genetics 130 animal experiment 129 drug effect 116 female 114 unclassified drug 106 animal tissue 103 rat 101 Female 100 Rats 95 human 90 protein expression 86 Humans 85 male 80 Male 74 chemistry 73 animal model 67 cytology 65 signal transduction 64 messenger RNA 63