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Fig. 4. Genomic analysis of DNA methylation. The suitability of a given
technique of DNA methylation analysis depends on the genome size of the
organism and the intended application. Bisulfite conversion coupled to
Illumina bead arrays is well suited to the measurement of methylation
polymorphism between multiple samples. A comprehensive analysis of methylation
in organisms with small genomes can be accomplished with any one of a variety
of techniques, whereas enrichment of unmethylated DNA is the preferred method
when analyzing most vertebrate genomes.