Animals animal male metabolism Male 311 nonhuman 233 controlled study 215 animal experiment 165 physiology 164 Article 158 female 152 priority journal 149 article 140 mouse 139 animal tissue 136 Female 122 Mice 117 genetics 105 drug effects 103 animal cell 100 protein expression 72 drug effect 67 adult 64 unclassified drug 63 animal model 62 cytology 59 in vitro study 55 rat 54 human 52 immunohistochemistry 51