3' untranslated region human 30 Humans 28 controlled study 28 messenger RNA 28 article 24 priority journal 24 nonhuman 22 unclassified drug 22 Animals 20 genetics 20 metabolism 20 5' untranslated region 14 RNA, Messenger 14 animal 14 gene expression regulation 14 3' Untranslated Regions 12 Article 12 gene expression 12 human cell 12 reverse transcription polymerase chain reaction 12 RNA 10 Transcription, Genetic 10 down regulation 10 embryo 10 genetic transcription 10 microRNA 10 mouse 10 nucleotide sequence 10 physiology 10