CpG refers to any cytosine nucleotide in DNA that neighbors a guanine. CpG site comes from "cytosine-phosphate-guanine site". These sites have the potential for a methyl (or other derivative) to be attached. Dense regions of CpG's are known as CpG islands.

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Gene silencing: relative or absolute number of methylated CpG sites?

CpG content varies a lot across the human genome. What does determine a promoter to be silenced through DNA methylation: the fraction of CpG sites that are methylated or the total number of methylated ...
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How correlated are proximally related CpG sites in human DNA?

Cytosine residues in DNA that can be methylated (i.e. CpG sites) are likely to be in the same methylation state if they are geographically (proximally) close together. I can only find one paper that ...