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Alignment of conserved regions of RNAi RdRPs. Comparison of putative RdRP amino acid sequence from different organisms including tomato plant, Neurospora (QDE-1), C. elegans (EGO-1, RRF-1), Arabidopsis (SDE1), and Dictyostelium discoideum (RrpA). Amino acids in red indicate conserved residues in all sequences in the alignment. Those in blue and green indicate conservative substitutions and semi-conservative substitutions, respectively
