Methylation level distributions in gene body and 2-kb flanking sequences in Arabidopsis. Absolute (a) and relative (b) methylation level distributions in gene body and 2-kb flanking sequences in Arabidopsis. Methylation levels along gene body and their 2 kb-flanking regions were calculated using an overlapping sliding window of 5% of sequence length at a step of 2.5% of sequence length. The related raw data for Arabidopsis were downloaded from http://www.ncbi.nlm.nih.gov/sra(SRA000284