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Precisions from alignments of Arabidopsis thaliana MMAP 24 nt siRNAs whose true origins are known based on a unique precursor alignment. Dots, data from individual libraries; horizontal bars, medians. Treatments sharing a common letter indicate groups that are not significantly different by nonparametric analysis (Kruskal-Wallis ANOVA with Dunn multiple comparison test, α = 0.05).
