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Exon

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The exon portion of a DNA strand encodes a specific portion of a protein. In some organisms exons are situated between introns which are spliced from the strand before it is exported from the nucleus and do not code for protein parts.

Exons are the regions of a transcribed gene that are not spliced out and which are retained in the final mRNA molecule. Most exons are in protein-coding regions of mRNA molecules, but many are located either before or after the protein-coding region, and many mRNAs have no protein-coding regions whatsoever.

Exons can be spliced out during the process of alternative splicing.

Exon trapping is a clever molecular biology technique that exploits the existence of the intron-exon architecture to find new genes.

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