= CG methylation
{c}
Methylation in the symmetric CG sequence context.
The symmetry matters after <DNA replication>: each daughter duplex can retain a methylated parental strand and an initially unmodified new strand. <Maintenance DNA methylation> can use that relationship to help restore the previous pattern, without changing the underlying base sequence. <Molecular Biology of the Cell, 4th edition by Bruce Alberts and others>[Chapters 4–7, chromatin, replication and gene regulation]{ref}
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