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Site-specific patterns of Arabidopsis nat-siRNAs At4g35850/At4g35860 (a), At2g33793/At2g33796 (b), and At1g51400/At1g51402 (c). siRNAs that positively or negatively map to the upper genes are present above or under the gene pair, respectively. The introns of cis-NATs are represented by blue strands and overlapping regions of cis-NATs are shown by green lines. The black arrow represents the siRNAs detected by Northern blot.
