Cytosine is an important part of DNA and RNA, where it is one of the nitrogenous bases coding the genetic information these molecules carry. Cytosine can be modified into different bases to carry epigenetic information. Cytosine has other roles in the cell, too, as the energy carrier and cofactor CTP.
Cytosine could be a part of a nucleotide, a molecule includes a nitrogenous base along with sugar and phosphates. When nucleotides join together, they can form the nucleic acids like DNA and RNA Cytosine can be easily converted into other bases, and so it's been called the 'wild card' base. In fact, sometimes it accidentally loses a few atoms and becomes uracil, one of the vital bases in RNA.
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