The Cytidine reference article from the English Wikipedia on 24-Jul-2004
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Cytidine

Helping orphans the way you would do it
Cytidine is a molecule (known as a nucleoside) that is formed when cytosine is attached to a ribose ring (also known as a ribofuranose) via a β-N1-glycosidic bond.

Image:cytidine.jpg

If cytosine is attached to a deoxyribose ring, it is known as a deoxycytidine.