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3' End (Three Prime End)
Definition: The terminus of a nucleic acid molecule that consists of a hydroxyl group attached to the 3' carbon of the terminal sugar. Nucleic-acid synthesis consists of adding nucleotides to this end of the molecule. (The opposite terminus is the 5' end.)
Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.