Top Definition
A length of bases in a nucleic acid sequence inside of a gene which are not used in encoding the amino acid sequence in the protein. Either a result of that fact that eukaryotic cells haven't evolved the speedy reproduction methods of prokaryotic cells, or a security protocal which god designed to prevent humans from determining the genetic code and the human genome, kind of like a genetic region code
there's three introns and four exons on that gene
by george miller January 22, 2005
6 Words related to intron

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