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What is an intron?

What is an intron? Here are some definitions.

Noun
  1. (genetics) A portion of a split gene that is included in pre-RNA transcripts but is removed during RNA processing and rapidly degraded.
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The fragments were cloned and DNA sequencing demonstrated that they actually corresponded to cDNA with proper intron splicing.
The resulting totals for each intron were then randomly resampled with replacement and a value of m was calculated from each resultant data set.
Dashed lines joining the two gene duplicates indicate the potential intron loss in the bottom copy relative to the top copy.
There are also two dinucleotide microsatellites and one mononucleotide microsatellite, all in the first intron.
The second insertion traps an exon of a different gene contained in an intron of the former gene.
Each intron is removed in a separate series of reactions by a complicated piece of enzymatic machinery called a spliceosome.

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