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A nucleotide is one of the structural components, or building blocks,
of DNA and RNA. A nucleotide consists of a base (one of
four chemicals: adenine, thymine, guanine, and cytosine)
plus a molecule of sugar and one of phosphoric acid.
More: C, T, and U are called pyrimidines and each has a single nitrogen-containing ring. A and G are called purines and each has
two nitrogen-containing rings.
Source: definition from the National Human Genome Research Institute (NHGRI)
Glossary of Genetic Terms.
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