Biology / Bio 1279 · Atom · ~20 seconds
The 5' and 3' Untranslated Regions
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A mature mRNA's untranslated regions flank the coding sequence, upstream of the start codon and downstream of the stop codon.
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The 5' region sits between cap and start codon; the 3' region sits between stop codon and poly-A tail.
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An untranslated region is still transcribed and spliced with the mRNA — only its translation into protein is what it lacks.