messenger RNA protein expression 244 controlled study 206 nonhuman 200 article 184 Animals 172 priority journal 160 animal cell 138 animal experiment 110 RNA, Messenger 104 mouse 102 human 100 animal tissue 98 unclassified drug 94 Mice 88 female 88 Female 86 male 82 Humans 80 metabolism 80 Male 70 animal 70 signal transduction 64 human cell 62 rat 62 Rats 60 genetics 60 protein function 58 Article 56 reverse transcription polymerase chain reaction 54