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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
http://www.medicinenet.com/script/main/art.asp?articlekey=14000
Last Editorial Review: 6/14/2012

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