Male animal male 209 metabolism nonhuman Animals 199 controlled study 181 animal experiment 153 priority journal 133 Article 130 animal tissue 108 physiology 104 mouse 99 animal cell 86 Mice 81 female 78 article 74 Female 70 protein expression 70 drug effects 67 genetics 67 unclassified drug 57 animal model 52 adult 50 rat 42 drug effect 41 gene expression 41 in vitro study 39 pathology 37 cytology 35