![]() Typically, methylation turns genes “off” and demethylation turns genes “on.” Histone modificationĭNA wraps around proteins called histones. This chemical group can be removed through a process called demethylation. Typically, this group is added to specific places on the DNA, where it blocks the proteins that attach to DNA to “read” the gene. ![]() DNA methylation works by adding a chemical group to DNA.
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