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特許 係属中 DNA (cytosine-5-)-methyltransferase 3 beta, also known as DNMT3B, is a protein associated with immunodeficiency, centromere instability and facial anomalies syndrome. CpG methylation is an epigenetic modification that is important for embryonic development, imprinting, and X-chromosome inactivation. Studies in mice have demonstrated that DNA methylation is required for mammalian development. This gene encodes a DNA methyltransferase which is thought to function in de novo methylation, rather than maintenance methylation.