cytosine
/ˈsaɪtəˌsin/
noun
- One of the four main chemical bases found in DNA and RNA, often represented by the letter C.
- In DNA, cytosine always pairs with guanine.
- The sequence of cytosine, adenine, thymine, and guanine makes up the genetic code.
- A mutation changed a cytosine to a thymine in the gene.