cytosine
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(sī′tō-sĭn)

C4H5N3O; a pyrimidine base that is part of DNA and RNA. In DNA it is paired with guanine.
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(sī′tō-sĭn)

C4H5N3O; a pyrimidine base that is part of DNA and RNA. In DNA it is paired with guanine.
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