male protein expression 324 controlled study 302 nonhuman 286 priority journal 242 Male 234 article 228 Animals 218 animal experiment 216 animal tissue 162 animal cell 156 mouse 144 female 132 animal model 118 human 116 Mice 114 Humans 98 Female 96 animal 88 Article 86 human cell 86 metabolism 86 messenger RNA 82 rat 78 unclassified drug 78 adult 66 immunohistochemistry 66 cell proliferation 62 Rats 56 in vivo study 56