Animals Male male 201 metabolism nonhuman animal 199 controlled study 181 animal experiment 145 priority journal 131 Article 130 animal tissue 106 physiology 104 mouse 101 Mice 83 animal cell 82 female 74 protein expression 70 drug effects 67 genetics 67 Female 66 article 66 unclassified drug 53 animal model 52 adult 50 gene expression 41 drug effect 39 in vitro study 39 pathology 37 immunohistochemistry 35 in vivo study 35