320 - 325°C (decomp)
Cytosine is one of the 5 main nucleobases used in storing and transporting genetic information within a cell in the nucleic acids DNA and RNA.
In DNA and RNA, cytosine is paired with guanine. However, it is unstable, and can change into uracil. This can lead to a point mutation if not repaired. The DNA repair enzymes, such as uracil glycosylase, cuts uracil in DNA.