How are alu elements unusual as retrotransposons?

Answer:
Retrotransposons are subdivided into two categories: LTR and without LTR. Without LTR is also subdivided into two:LINE and SINE. We know that retrotransposons replicate themselves. However, Sıne have not got reverse transcriptase enzymes ,it doesn't repliate themselves without Line retrotranspozon.
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