ISPE Glossary of Pharmaceutical and Biotechnology Terminology

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Nucleoside

A base (purine or pyrimidine) that is covalently linked to a 5-carbon (pentose) sugar. When the sugar is ribose, the nucleoside is a ribonucleoside; when it is deoxyribose, the nucleoside is a deoxyribonucleoside. Adenine, guanine and cytosine occur in both DNA and RNA; thymine occurs in DNA; and uracil in RNA. They are the building blocks of DNA and RNA.

Publication Source: Food and Agricultural Organization of the United Nations (FAO)
Publication Date: 1999

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