Male animal controlled study male 183 nonhuman 183 priority journal Animals 181 animal experiment 133 metabolism 125 Article 124 physiology 95 animal tissue 89 female 81 animal cell 77 mouse 77 Female 75 Mice 65 genetics 62 article 61 adult 60 drug effects 49 drug effect 48 animal model 47 protein expression 44 in vitro study 41 unclassified drug 39 gene expression 32 human 30 in vivo study 30 rat 30