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in⋅tron

   [in-tron]
–noun Genetics.
a noncoding segment in a length of DNA that interrupts a gene-coding sequence or nontranslated sequence, the corresponding segment being removed from the RNA copy before transcription.
Also called intervening sequence.
Compare exon 2 .

Origin:
1975–80; perh. intr(o)- + -on 1
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
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in·tron     (ĭn'trŏn)  Pronunciation Key 
n.   A segment of a gene situated between exons that is removed before translation of messenger RNA and does not function in coding for protein synthesis.


[intr(agenic), occurring within a gene (intra- + genic) + -on1.]

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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intron

noun
sequence of a eukaryotic gene's DNA that is not translated into a protein [ant: coding dna] 

WordNet® 3.0, © 2006 by Princeton University.
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intron   (ĭn'trŏn)  Pronunciation Key 
A segment of a gene situated between exons that does not function in coding for protein synthesis. After transcription of a gene to messenger RNA, the transcriptions of introns are removed, and the exons are spliced together by enzymes before translation and assembly of amino acids into proteins. Compare exon.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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intron

A stretch of DNA in a gene that does not code for proteins. In eukaryotes, introns in a given gene separate stretches of DNA that contain instructions for constructing proteins. (Compare exon.)


[Chapter:] Life Sciences


The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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