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orientation to transposable element transcripts and are derived from the product of Aub cleavage of transposon mRNA. As such, Ago3 piRNA lack the ability to target transposable element transcripts directly. Therefore, it was proposed that Ago3 piRNA guide the production of piRNA that are loaded into Aub by targeting newly exported piRNA cluster transcripts. Several lines of evidence support the effect of Ago3 on the production of Aub piRNA, in particular from examining the piRNA repertoire in Drosophila ovaries that are mutant for Ago3 and the

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