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base' pair'

Genetics.
any of the pairs of the hydrogen-bonded purine and pyrimidine bases that form the links between the sugar-phosphate backbones of nucleic acid molecules: the pairs are adenine and thymine in DNA, adenine and uracil in RNA, and guanine and cytosine in both DNA and RNA.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

base on balls

base-pairing

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