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Definition: The molecular subunit of a nucleotide attached at the 1' carbon of deoxyribose or ribose and which participates in hydrogen bonding between nucleotide strands. Includes adenine, cytosine, guanine, thymine, and uracil.
Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.