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nuclear winter
nuclearize
nuclease
nucleate
nucleation
nuclei
nucleic acid
nuclein
nucleo-
nucleocapsid
nucleoid
nucleolar
nucleolar organizer
nucleolus
nucleon
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nucleotide base
nu·cle·o·tide base (plural nu·cle·o·tide bas·es)


noun 
Definition:
 
unit containing nitrogen in nucleotide: the nitrogen-containing unit in a nucleotide, e.g. adenine or guanine
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