The base sequences that are left behind after the introns have been spliced out by enzymes are the exons.
Exons are any regions of a gene that, once introns have been excised via RNA splicing, will make up a portion of the gene's final mature RNA product.
Both the DNA sequence found within a gene and the matching sequence in RNA transcripts are referred to as exons.
In order to produce the mature RNA, RNA splicing involves the removal of introns and the covalent joining of exons.
The exome is made up entirely of exons, just as a species' genome is made up entirely of its genes.
A newly created precursor messenger RNA (pre-mRNA) transcript is converted into a mature messenger RNA through the molecular biology process of RNA splicing (mRNA).
Exons are rejoined when the introns (RNA's non-coding regions) have all been removed (coding regions).
Splicing takes place in the nucleus either during or right after transcription for genes that are nuclear-encoded.
Splicing is typically required for eukaryotic genes that have introns in order to produce an mRNA molecule that can be translated into protein.
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