Animals animal experiment male metabolism nonhuman 167 animal 165 controlled study 163 Male 145 Article 122 priority journal 112 animal tissue 97 mouse 94 physiology 84 Mice 80 drug effects 74 animal cell 69 animal model 60 female 60 genetics 55 protein expression 54 adult 46 article 45 unclassified drug 45 Female 40 drug effect 37 pathology 35 human 34 in vivo study 34 signal transduction 33 Humans 32