controlled study male protein expression nonhuman 259 priority journal 214 Male 205 animal experiment 201 article 199 Animals 197 animal tissue 148 animal cell 143 mouse 130 animal model 111 female 110 human 103 Mice 102 Article 86 Humans 83 animal 79 human cell 79 metabolism 77 Female 76 messenger RNA 76 rat 76 unclassified drug 76 adult 56 immunohistochemistry 55 Rats 54 cell proliferation 53 in vivo study 52