Polymorphic CpG sites can be considered metastable epialleles, are thought to be particularly vulnerable to environmental influences

Dolinoy et al. 2007:

Polymorphic CpG sites can be considered metastable epialleles that are variably expressed and are thought to be particularly vulnerable to environmental influences.

http://www.ncbi.nlm.nih.gov/pubmed/17413847

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