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Nucleotide - illustration
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.

Courtesy of the [url=https://www.genome.gov/]National Human Genome Research Institute (genome.gov)[/url].

Nucleotide - illustration

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.

Courtesy of the National Human Genome Research Institute (genome.gov).

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