'Deoxycytidine diphosphate' is a derivative of the common
nucleic acid,
cytidine triphosphate or (CTP), in which the
hydroxyl or (-OH) group on the 2nd carbon of the nucleotide's
pentose has been removed -- hence the ''deoxy-'' part of the name. Additionally, the
diphosphate of the name indicates that one of the
phosphoryl groups of CTP has been removed, most likely by
hydrolysis.
Deoxyguanosine diphosphate would be abbreviated dCDP.
See also
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DNA
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Cofactor
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Cytosine