Male animal male 175 metabolism Animals 151 nonhuman 101 controlled study 90 article 86 animal experiment 79 physiology 71 female 69 Article 65 Female 65 priority journal 65 mouse 60 animal tissue 52 Mice 51 genetics 47 animal cell 42 rat 42 drug effects 39 Rats 38 drug effect 37 protein expression 33 in vitro study 30 unclassified drug 29 adult 27 animal model 26 Animal 25 cytology 25