A daughter duplex can initially contain a modified parental strand paired with an unmodified new strand. A maintenance system restores the matching mark, whereas de novo methylation establishes marks at previously unmodified positions. These are different ways to preserve or alter an epigenetic pattern. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapters 4–7, chromatin, replication and gene regulation
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