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Unformatted text preview: mRNA transcript . Processing the mRNA Transcript In eukaryotic cells, the newly-formed mRNA transcript (also called heterogenous nuclear RNA or hnRNA) must be further modified before it can be used. A cap is added to the 5 end and a poly-A tail (150 to 200 Adenines) is added to the 3end of the molecule. Eukaryotic genes contain regions that are not translated into proteins. These regions of DNA are called introns and must be removed from mRNA. Their function is not well understood. The remaining portions of DNA that are translated into protein are called exons . After intron-derived regions are removed from mRNA, the remaining fragments- derived from exons- are spliced together to form a mature mRNA transcript ....
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