Transposons are ubiquitous in prokaryotic and eukaryotic organisms and are major determinants of genome structure. Transposition - the movement of discrete segments of DNA without a requirement for homology - occurs by a handful of mechanisms that are used over and over again in different combinations. Understanding these mechanisms provides an important key to unlocking the secrets of genome organization and evolution.
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Johnson R. C., 2002, MOBILE DNA-UK, VII, P230