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Definition of Exon

Exon: The region of a gene that contains the code for producing protein. Each exon codes for a specific portion of the complete protein. Exons are separated by introns, long regions of DNA that have no apparent function.

Exons are also called coding DNA.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=3353
Last Editorial Review: 8/28/2013

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