Hervé Vaucheret is at the Laboratoire de Biologie Cellulaire, Institut Jean-Pierre Bourgin, INRA, 78026 Versailles Cedex, France. vauchere@versailles.inra.fr
RNA-based silencing mechanisms suppress gene expression through the sequence-specific activity of small RNAs. New studies in plants now identify atypical RNA polymerases that promote and maintain transcriptional silencing.
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