Mammalian DNA Methyltransferase (DNMT)
Three active DNA methyltransferases have been identified in mammals. They are named DNMT1, DNMT3A, and DNMT3B. A fourth enzyme previously known as DNMT2 is not a DNA methyltransferase (see below).
DNMT3L is a protein closely related to DNMT3A and DNMT3B in structure and critical for DNA methylation, but appears to be inactive on its own.
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