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.
Zhang et al. Genome Biology 2012 13:R20 doi:10.1186/gb-2012-13-3-r20