Additional file 2.

(a-d) Distributions of the lengths (a, b) and the first nucleotides (c, d) of total siRNAs and nat-siRNAs in stress-challenged Arabidopsis and rice. (a) Length distributions of unique sequencing reads in Arabidopsis. The blue and red bars represent total siRNAs and nat-siRNAs, respectively. (b) Length distributions of unique sequencing reads in rice. The blue and red bars represent total siRNAs and nat-siRNAs, respectively. (c) First-nucleotide distribution of unique sequencing reads in Arabidopsis. (d) First-nucleotide distribution of unique sequencing reads in rice.

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