Animals male protein expression nonhuman 206 controlled study 197 Male 185 animal experiment 164 priority journal 159 article 151 animal tissue 120 animal cell 115 Mice 108 mouse 104 animal 84 animal model 84 female 82 metabolism 72 Female 70 rat 60 messenger RNA 56 Article 54 Rats 54 immunohistochemistry 53 Humans 50 human 49 unclassified drug 46 physiology 43 in vivo study 41 human cell 39 protein function 39