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DNA is made up of different units called nucleotides. There are a variety of four different nucleotides that make up the Polymer that is DNA[1]. DNA consists of two different regions, one being Exons and the other Introns. The regoins of exons in the DNA consist of fewer nuclotides than the regoins of introns and are the coding regions for proteins[2]. It is also now thought that enhancer sequences for regulation of gene transcription is not just found in Introns but now in Exons as well[3].


  1. Alberts .B. (2008) Molecular Biology of the Cell, 5th Edition, New York: Garland Science
  2. Gilbert W, 1978 "Why genes in pieces?", Nature, 271 (5645): 501
  3. Purnel;, B. Exons. Exons Encode Enhancers. Science 2012. Vol:336(6079), pp.277-277
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