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DNA methylation and covalent histone modifications are crucial components of genome regulation,including transposon silencing.To better understand these epigenetic phenomena that occur in diploid and autotetraploid Arabidopsis thaliana,we profiled the chromosomal distribution of cytosine and various histone H3 lysine residues methylation patterns using a tiling DNA microarray of chromosome 4.Repeated sequences and transposable elements (TEs),especially LTR retrotransposons,are densely methylated in the diploid A.