junk DNA
DNA for which a function has yet to be identified. An elaborate nomenclature has been proposed for this DNA: any stretch of DNA is a nuon; DNA with an evolutionary potential for development of function is a potonuon; DNA that was previously non-functional, or that had a completely different function and has been evolutionarily co-opted for a new function (a process termed exaptation), is a xaptonuon; and a non-co-opted potonuon is a naptonuon.Brosius, J. and Gould, S.J. (1992) Proc. Natl. Acad. Sci. U.S.A. 89, 10706-10710; Nowak, R. (1994) Science 263, 608-610; Flam, F.F. (1994) Science 266, 1320
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