Non-CG methylation is well characterized in plants, where it appears to play a role in gene silencing and genomic imprinting. Although strong evidence for the presence of non-CG methylation in animals has been available for some time, both its origin and function remain elusive. In this review we discuss available evidence on non-CG methylation in animals in light of evidence suggesting that the human stem cell methylome contains significant levels of methylation outside the CG site.
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Dyachenko et al. (2010) studied this question.
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