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DRB3 is not required for biogenesis of geminivirus-derived siRNAs. RNA blot hybridization shows the accumulation of virus-specific siRNAs in BCTV-infected wild-type (Col-0 and Ler-0) and mutant (drb3, drb4, dcl3, dcl4, and ago4) plants. Ethidium bromide-stained rRNA served as a loading control. The positions of oligonucleotide size markers are indicated at the left.
