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5' end

In mRNA, the 5' end of a newly synthesized molecule corresponds to the transcription initiation point associated with a promoter. RNA processing steps and degradation may remove or modify this terminus so that the transcription initiation point is absent from the mature mRNA molecule and, consequently, from any cDNA made from the mature mRNA. By convention, nucleic acid sequences are written with th 5' end at the left.
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