Animals 162 Rats priority journal protein expression nonhuman 160 article 150 rat 150 controlled study 146 animal experiment 98 Rats, Sprague-Dawley 94 animal tissue 92 animal cell 90 Female 78 female 70 Male 54 messenger RNA 48 male 46 protein function 42 RNA, Messenger 40 animal model 40 unclassified drug 40 Ovary 34 enzyme activity 34 Blotting, Western 30 Humans 30 Immunohistochemistry 30 Mice 30 Rats, Wistar 30 immunohistochemistry 30 signal transduction 30