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Retroposons, also called retrotransposons, are related to transposons. They copy themselves to RNA and then, via reverse transcriptase, back to DNA. Many retroposons have LTRs (long terminal repeats) at their ends that can contain over 1000 base pairs each. Like transposons, they create direct repeats at their entry site, which can be used to detect them. About 40% of the human genome supposedly consists of retroposons. See also: transposon, genetics, Alu sequence