Animals animal cell article nonhuman 284 rat Rats 275 priority journal 239 controlled study 233 Rats, Sprague-Dawley 141 animal experiment 115 Female 113 animal tissue 111 female 103 Male 85 protein expression 83 unclassified drug 83 male 73 Animalia 67 Cells, Cultured 62 animal model 60 Humans 56 animal 56 messenger RNA 52 metabolism 52 Mice 49 signal transduction 49 protein function 48 Rats, Wistar 47 RNA, Messenger 46 mouse 46