Definition of nucleobase Nucleobase
We found 3 definitions of nucleobase from 3 different sources.
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What does nucleobase mean?
Wiktionary 
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nucleobase
The base of a nucleic acid, such as thymine, uracil, adenine, cytosine and guanine.
Wikipedia 
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Nucleobases are important for genetics. They are parts of RNA and DNA that may be involved in pairing (see base pair).
They include cytosine, guanine, adenine, thymine in (DNA), uracil in (RNA) and xanthine and hypoxanthine (mutated forms of guanine and adenine). These are abbreviated as C, G, A, T, U, X and HX respectively. They are usually simply called bases in genetics. Because A, G, C and T appear in the DNA, these molecules are called DNA-bases; A, G, C and U are called RNA-bases.
