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The ability of several viroids to induce posttranscriptional gene silencing has been demonstrated; however, the structure recognized by the Dicer enzyme(s) responsible for the initiation of this mechanism remains a mystery. Here, we show that the hairpin known to be implicated in the replication of peach latent mosaic viroid has the ability to trigger the Dicer enzyme(s). This domain, which is composed of a succession of several small stems separated by symmetrical bulges, is reminiscent of the precursor micro-RNAs.

Identification of a Peach Latent Mosaic Viroid Hairpin Able To Act as a Dicer-Like Substrate