Louise Jones, Andrew J. Hamilton, Olivier Voinnet, Carole L. Thomas, Andrew J. Maule, David C. Baulcombe, RNA-DNA Interactions and DNA Methylation in Post-Transcriptional Gene Silencing, The Plant Cell, Vol. 11, No. 12 (Dec., 1999), pp. 2291-2301
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Jones et al. (1999) studied this question.