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Etymology edit

After German Cytosin, equivalent to Ancient Greek κύτος (kútos) + -ine. Cytosine was discovered and named by the German biochemists Albrecht Kossel and Albert Neumann in 1894 when it was hydrolyzed from calf thymus tissues.

Pronunciation edit

  • IPA(key): /ˈsaɪtəsiːn/
  • (file)

Noun edit

cytosine (plural cytosines)

  1. (biochemistry) A heterocyclic base, 4-aminopyrimidin-2(1H)-one, which pairs with guanine in DNA and RNA (by means of three hydrogen bonds).
    Hypernyms: nucleobase, pyrimidine
    Coordinate terms: adenine, guanine, thymine, uracil
    • 1997, Ian McEwan, Enduring Love, Vintage (1998), page 164:
      Then he found them, the substances that made up the four-letter alphabet in whose language all life is written — adenine and cytosine, guanine and thymine.

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