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Length distribution and first-nucleotide distribution of nat-siRNA in Bre and Wut. (A) Length distribution of nat-siRNAs in Brassica rapa ssp. pekinensis cv. Bre; (B) Length distribution of nat-siRNAs in B. rapa ssp. chinensis cv. Wut; (C) First-nucleotide distribution of nat-siRNAs in cv. Bre; (D) First-nucleotide distribution of nat-siRNAs in cv. Wut.
