A nucleoside compound consisting of the base cytosine attached to a ribose sugar; a building block of RNA.
From 'cytosine' + '-ine' (chemical suffix). Named systematically in the early 1900s as biochemists identified and named RNA building blocks.
Cytidine is one of the four letters in the RNA alphabet—if DNA is like a book written in four letters, then cytidine is the 'C' you need to spell out every gene's instructions.
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