Medical Definition of U (uracil)
U (uracil): A nucleotide base and one member of the A-U (adenine-uracil) base pair in RNA. The other base pair in RNA is G-C (guanine-cytosine).
Uracil takes the place in RNA that thymine (T) occupies in DNA.Source: MedTerms™ Medical Dictionary
Last Editorial Review: 6/9/2016
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