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What (who) is intron - definition
![The Domain V substructure that is shared between Group II introns and [[U6 spliceosomal RNA]].](https://commons.wikimedia.org/wiki/Special:FilePath/Domain-V-secondary-structure.svg?width=200 "The Domain V substructure that is shared between Group II introns and [[U6 spliceosomal RNA]].")
Wikipedia
An intron is any nucleotide sequence within a gene that is not expressed or operative in the final RNA product. The word intron is derived from the term intragenic region, i.e., a region inside a gene. The term intron refers to both the DNA sequence within a gene and the corresponding RNA sequence in RNA transcripts. The non-intron sequences that become joined by this RNA processing to form the mature RNA are called exons.
Introns are found in the genes of most organisms and many viruses and they can be located in both protein-coding genes and genes that function as RNA (noncoding genes). There are four main types of introns: tRNA introns, group I introns, group II introns, and spliceosomal introns (see below). Introns are rare in Bacteria and Archaea (prokaryotes), but most eukaryotic genes contain multiple splicesomal introns.
