Introns and exons  1 The genetic code was experimentally deciphered long before the nucleotide sequence of genes was determined introns mature RNA Therefore, it was really a surprise when, in 1977, the first eukaryotic genome was obtained, and it was discovered that many genes contain intervening sequences, called introns, interrupting the coding regions, which were recombined into the mature RNA Since then, in eukaryotic cells, at least eight different types of introns have been identified, although only one of these, which follows the rule GU  AG, is mainly associated to eukaryotic genes that encode for proteins 87
{"Image DocumentName": "Introduction \uf02d 4", "Image ImageDescription": "However, like any other system for information storage, the genome contains signals that allow the cell to determine the beginning and the end of a gene and when/how it should be expressed. A sense must be attached to the disconcerting organization of A, T, C, and G, which is a typical raw genomic data. Finally, it is worth noting that the development of new tools for finding genes did turn our attention to before unsuspected biological mechanisms, responsible for the regulation of gene expression.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}