Files in this Data Supplement:

• Supplemental file 1 - Table S1 (TRV-derived siRNAs from infected Nicotiana benthamiana and Arabidopsis plants.)
  Zipped MS Excel file, 20K.
• Supplemental file 2 - Table S2 (DNA properties of the PCR fragments amplified from the TRV1 genome.)
  Zipped MS Excel file, 8K.
• Supplemental file 3 - Table S3 (Minimum folding energies of sequence fragments from randomly selected Arabidopsis mRNAs.)
  Zipped MS Excel file, 3K.
• Supplemental file 4 - Fig.S1 (Predicted fold-back secondary structures for siRNA-containing regions along the positive-strand TRV2-PDS genome.)
  Fig.S2 (Predicted fold-back secondary structures within the 3′ UTR of TRV2, using the mfold program.)
  Zipped MS PPT file, 532K.
• Supplemental file 5 - Fig.S3 (Spatial distribution profile of TRV1-derived siRNAs in Arabidopsis dcl mutants.)
  Fig.S4 (Spatial distribution profile of TRV1-derived siRNAs in Arabidopsis rdr mutants.)
  Zipped MS PPT file, 344K.
• Supplemental file 6 - Supplemental figure legends.
  MS Word document, 27K.