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XRN2 and XRN3 Are Endogenous Suppressors of PTGS.
GUS protein activities contributed by the homozygous transgene loci L1 (A), Hc1 (B), and 6b4 (C) in control, ago1, xrn, and fry1 mutant leaves. Data are expressed as percentages of silenced plants in each genetic background. The number of individual plants analyzed is indicated above each bar.
