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In page Transposable element:
"As of this date, Retrotransposons are commonly grouped into three main categories:
- Retroposons, long interspersed nuclear elements (LINEs, LINE-1s, or L1s), which encode reverse transcriptase but lack LTRs, and are transcribed by RNA polymerase II;[citation needed] and
- Short interspersed nuclear elements (SINEs) that do not encode reverse transcriptase and are transcribed by RNA polymerase III.[citation needed]
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