controlled study male protein localization 60 nonhuman 58 article 52 priority journal 48 Animals 42 animal tissue 42 animal cell 40 Male 38 protein expression 32 female 28 animal experiment 24 immunohistochemistry 24 human 22 rat 22 mouse 20 protein function 20 Immunohistochemistry 16 human cell 16 messenger RNA 16 Blotting, Western 14 Mice 14 animal 14 metabolism 14 unclassified drug 14 Female 12 Humans 12 Rats 12 animal model 12