In imprinting, a methyl group is added to this base.
It must be protonated to participate in Hoogsteen pairing. In somatic hypermutation, it is targeted by AID. It but not an important modification of it is modified by bisulfite. Its nucleotide triphosphate form is used in the biosynthesis of some phospholipids. De-amination of this base results in (*) uracil. In imprinting, a methyl group is added to this base. This pyrimidine is normally involved in three hydrogen bonds in DNA. For 10 points, name this nitrogenous base that normally pairs with guanine in DNA.
It must be protonated to participate in Hoogsteen pairing. In somatic hypermutation, it is targeted by AID.
{cytosine} [or {C}]