cytosine

cy to sine |ˈsītəˌsēn ˈsaɪdəsin | ▶noun Biochemistry a compound found in living tissue as a constituent base of nucleic acids. It is paired with guanine in double-stranded DNA. [A pyrimidine derivative; chem. formula: C 4 H 5 N 3 O. ]

cytosine

cytosine |ˈsʌɪtəsiːn | ▶noun [ mass noun ] Biochemistry a compound found in living tissue as a constituent base of DNA. It is paired with guanine in double-stranded DNA. ●A pyrimidine derivative; chem. formula: C 4 H 5 N 3 O.