The attachment of a methyl group
group) to a cytosine
(one of four nitrogenous base
s found in DNA) in an eukaryotic DNA
mulecule. This is done routinely as a way to protect self DNA from the enzyme
s and chemicals produced to destroy foreign
DNA and as a way to regulate transcription
s in the DNA.
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.