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The various classes of plant 21- to 24-nt siRNAs derive from long dsRNA precursors that are processed by the ribonuclease Dicer-like (DCL). The species of ta-siRNA were originally discovered in Arabidopsis thaliana. Four gene families have been identified in Arabidopsis that each produces a number of ta-siRNAs: TAS1, TAS2, TAS3 and TAS4. The TAS3 genes encode ta-siR-ARF species which target the mRNA...
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