Source: cirosantilli/dna-methylation
= DNA methylation
{wiki}
The first found and most important known <epigenetic> marker.
Happens only on <adenine> and <cytosine>. <Adenine methylation> is much less common in <mammal> than <cytosine> methylation, when people say "methylation" they often mean just cytosine methylation.
It often happens on <promoters>, where it inhibits <transcription>.