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In page Transposable element:

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Retroviruses can also be considered TEs. After conversion of retroviral RNA into DNA inside a host cell, the newly produced retroviral DNA is integrated into the genome of the host cell, integrated DNA segments termed proviruses.[citation needed] The provirus is a specialized form of eukaryotic retrotransposon, which can produce RNA intermediates that may leave the host cell and infect other cells.[citation needed] The transposition cycle of retroviruses has similarities to that of prokaryotic TEs, suggesting a distant relationship between the two.[citation needed]