In molecular genetics, an untranslated region (or UTR) refers to either of two sections, one on each side of a coding sequence on a strand of mRNA. If it is found on the 5' side, it is called the 5' UTR (or leader sequence), or if it is found on the 3' side, it is called the 3' UTR (or trailer sequence).
- Atlas of UTR Regulatory Activity
- Mignone F, Gissi C, Liuni S, Pesole G (2002) "Untranslated regions of mRNAs." Genome Biol. 3(3):REVIEWS0004. 
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