Biologically Active Substance
cytosine Audio
cy·to·sine [ sahy-tuh-seen, -zeen, -sin ]
More Information:
ChemID; DailyMed; PDR
Definitions related to cytosine:
  • 2-keto-4-aminopyrimidine, one of the 5 major bases (with adenine, guanine, uracil, and thymine) which are a component of nucleic acids.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • A chemical compound that is used to make one of the building blocks of DNA and RNA. It is a type of pyrimidine.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • A pyrimidine base found in DNA and RNA that pairs with guanine.
    NCI
    U.S. National Cancer Institute, 2021
  • A pyrimidine base that is a fundamental unit of nucleic acids.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • Cytosine, a nitrogenous base derived from pyrimidine that occurs in nucleic acids, the heredity-controlling components of all living cells, and in some coenzymes, substances that act in conjunction with enzymes in chemical reactions in the body. Cytosine is one of several types of bases that are...
    Encyclopedia Britannica
    Encyclopedia Britannica, Inc., 2025
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