Definition of cytosine in English:



  • 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; chemical formula: C₄H₅N₃O

    ‘The nitrogen-containing units are the bases: adenine, cytosine, guanine, and uracil.’
    • ‘In DNA the bases pair to form a ladder-like structure, with adenine paired with thymine and guanine with cytosine.’
    • ‘The derivatives of purine are called adenine and guanine, and the derivatives of pyrimidine are called thymine, cytosine and uracil.’
    • ‘During DNA replication, DNA polymerase incorporates unmethylated cytosine opposite to guanine, leading to an overall reduction in methylation of DNA.’
    • ‘Isochores were defined as long genomic segments that are fairly homogeneous in their guanine and cytosine composition.’



/ˈsīdəˌsēn/ /ˈsaɪdəˌsin/