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cytosine (heterocyclic base, 4-aminopyrimidin-2(1H)-one, which pairs with guanine in DNA and RNA) noun [UK: sˈaɪtəsˌaɪn] [US: sˈaɪɾəsˌaɪn] | cytosine◼◼◼nom {f}DNA is composed of four nucleotides: adenine, thymine, cytosine and guanine. = L'ADN est composé de quatre nucléotides : adénine, thymine, cytosine et guanine. |