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complementary base

noun, Genetics.
either of the nucleotide bases linked by a hydrogen bond on opposite strands of DNA or double-stranded RNA: guanine is the complementary base of cytosine, and adenine is the complementary base of thymine in DNA and of uracil in RNA.
Compare base pair. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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