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exonExon (ger.)

  • A section of a DNA or RNA molecule that codes for a protein, in cases where such sections are separated by non-coding ones. (OED 2011)
    gene intron

    The notion of the cistron […] must be replaced by that of a transcription unit containing regions which will be lost from the mature messenger—which I suggest we call introns (for intragenic regions)—alternating with regions which will be expressed— exons.

    Gilbert, W. (1978). Why genes in pieces? Nature 271, 501.


    exon In eukaryotic chromosomes, that portion ofa DNA strand within a gene that codes for a protein; cf. intron.

    Lincoln, R.J., Boxshall, G.A. & Clark, P.F. (1982). A Dictionary of Ecology, Evolution and Systematics: 89.