controlled study messenger RNA nonhuman 321 article 274 priority journal 271 Animals 251 protein expression 191 animal cell 186 animal experiment 169 RNA, Messenger 162 animal tissue 160 unclassified drug 148 mouse 147 metabolism 135 male 126 human 118 female 114 animal 111 Mice 110 Humans 108 gene expression 108 genetics 108 Article 106 Male 106 Female 100 rat 90 reverse transcription polymerase chain reaction 82 animal model 81 human cell 78 signal transduction 78