| http://www.w3.org/ns/prov#value | - Hongjun Song, Ph.D.DNA methylation is a process, in normal development, whereby cells turn off genes they don???t need by attaching a chemical methyl group to the DNA. Historically, scientists believed methyl groups could only stick to a particular DNA sequence: a cytosine followed by a guanine, called CpG. But in recent years, methylation has been found on other DNA sequences in stem cells and in
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