Medical term:

Intron



in·tron

(in'tron),
A portion of DNA that lies between two exons, is transcribed into RNA, but does not appear in that mRNA after maturation because the intron is removed and the exons spliced together, and so is not expressed (as protein) in protein synthesis. By customary usage, the term is extended to the corresponding regions in the primary transcript of mRNA before maturation.
Synonym(s): intervening sequence
[inter- + -on]
Farlex Partner Medical Dictionary © Farlex 2012

intron

(ĭn′trŏn)
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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

in·tron

(in'tron)
A portion of DNA that lies between two exons, is transcribed into RNA, but does not appear in that RNA after maturation, and so is not expressed (as protein) in protein synthesis.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

intron

A non-coding segment of a DISCONTINUOUS GENE. Introns are lengths of DNA interposed between coding segments (EXONS) in a gene and are transcribed into MESSENGER RNA but are then removed from the transcript and the exons spliced together. Introns do not contain biological information.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

intron

or (‘in’ for intervening) - an intervening nucleotide sequence in an INTERRUPTED split gene. Such sequences are transcribed into primary RNA transcripts, but then excised from the RNA, leaving behind the EXON sequences for the functional gene product. See RNA PROCESSING, RNA SPLICING.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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