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.
Result of Your Query
exonExon (ger.)
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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)
- 1978
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Gilbert, W. (1978). Why genes in pieces? Nature 271, 501.
- 1982
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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.