Introns

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Introns are non-coding sequences of DNA found between coding sections known as exons in eukaryotic genes and in rare cases in some prokaryotic cells [1].
Introns are removed by splicing by the spliceosome and other associated proteins that are recruited in the process of forming mature mRNA from pre-mRNA [2].

References
  1. Khan AU, Ajamaluddin M, Ahmad M.(2001 Oct) A unique group of self-splicing introns in bacteriophage T4. Indian J Biochem Biophys. 38(5):289-93.
  2. Hogg R, McGrail JC, O'Keefe RT.(Aug 2010) The function of the NineTeen Complex (NTC) in regulating spliceosome conformations and fidelity during pre-mRNA splicing. Biochem Soc Trans. 38(4):1110-5.