Regulation of imprinting: A multi-tiered process.

Abstract excerpt

Although most mammalian genes are expressed from both alleles, there is a small group of special genes which are imprinted so that only one of the parental alleles is actually expressed in target cells. This epigenetic process involves regulation at a number of different stages of development and is very complex. In principle, imprinted gene regions must be marked in cis in the gametes using epigenetic features...

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