Animals male metabolism animal 345 Male 313 nonhuman 235 controlled study 217 animal experiment 167 physiology 164 Article 158 female 152 priority journal 151 article 142 mouse 141 animal tissue 136 Female 122 Mice 119 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