Winfried Schiebel, , Leonhard Riedel, Sabine Thalmeir, Rosemarie Schiebel, Dirk Kempe, Friedrich Lottspeich, , Michael Wassenegger, Isolation of an RNA-Directed RNA Polymerase-Specific cDNA Clone from Tomato, The Plant Cell, Vol. 10, No. 12 (Dec., 1998), pp. 2087-2101
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Schiebel et al. (1998) studied this question.