Animals Rats controlled study male rat nonhuman 192 Male 190 article 184 animal experiment 154 priority journal 146 animal tissue 109 Rats, Sprague-Dawley 101 Rats, Wistar 72 animal cell 67 animal model 57 protein expression 54 female 49 Female 45 unclassified drug 41 Time Factors 39 messenger RNA 38 RNA, Messenger 34 Rattus 34 enzyme activity 33 animal 32 Animalia 27 Hippocampus 25 hippocampus 25 Immunohistochemistry 23 signal transduction 23