CHH islands: de novo DNA methylation in near-gene chromatin regulation in maize.

Each CHH quartile was associated with progressively higher average gene expression, and the differences between the first and second and between the second and third quartiles were highly significant ( P -values < 0.005 for rejection of the null hypothesis of no difference between categories).

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We examined this phenomenon further by looking at siRNA distributions around individual genes, and we noticed a strong trend for 24-nt siRNAs to be concentrated very close to gene ends, as illustrated by a cluster of genes in Figure 1A .

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