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/ˈsaɪtəsiːn/ · noun
(biochemistry) A heterocyclic base, 4-aminopyrimidin-2(1H)-one, which pairs with guanine in DNA and RNA (by means of three hydrogen bonds)..
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.
Use cytosine when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Cytosine means (biochemistry) A heterocyclic base, 4-aminopyrimidin-2(1H)-one, which pairs with guanine in DNA and RNA (by means of three hydrogen bonds)..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
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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