The structure below shows methylcytosine, the methylated counterpart of cytosine:
It functions in relation to gene expression and is known to be an epigenetic mark, as the methylated genes have altered expressions.
Deamination of 5-methylcytosine _____.
A. converts that base to a uracil
B. converts that base to a thymine
C. happens mostly in RNA
D. is an epigenetic mark
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