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In some organisms, a host RNA-dependent RNA polymerase (RdRp) uses the single-stranded RNA (ssRNA) templates removed from the primary siRNAs to synthesize mobile secondary siRNA duplexes for amplification and spread of the silencing signal throughout host tissues 5,6

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Can J Genet Cytol 13(2):287291 Legg P, Collins G (1988) Registration of HI and LI Burley 21 tobacco germplasm