controlled study messenger RNA nonhuman 96 rat article 86 Animals 76 priority journal 76 Rats 74 animal cell 60 animal experiment 60 animal tissue 60 protein expression 56 male 54 Male 48 RNA, Messenger 44 Rats, Sprague-Dawley 44 Female 34 female 32 unclassified drug 30 animal model 26 Reverse Transcriptase Polymerase Chain Reaction 24 protein function 20 reverse transcription polymerase chain reaction 20 Gene Expression Regulation 18 Humans 18 Progesterone 18 enzyme activity 18 gene expression 18 Rats, Wistar 16 Rattus 16