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Small RNAs trigger repressive DNA methylation at thousands of transposable elements in a process called RNA‐directed DNA methylation (RdDM). The molecular mechanism of RdDM is well characterized in Arabidopsis, yet the biological function remains unclear, as loss of RdDM in Arabidopsis causes no overt defects, even after generations of inbreeding. It is known that 24 nucleotide Pol IV‐dependent siRNAs,...
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