
Dihydrouridine (abbreviated as D, DHU, or UH2) is a pyrimidine which is the result of adding two hydrogen atoms to a uridine, making it a fully saturated pyrimidine ring with no remaining double bonds. D is found in tRNA and rRNA molecules as a nucleoside; the corresponding nucleobase is 5,6-dihydrouracil. Because it is non-planar, D disturbs the ...
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http://en.wikipedia.org/wiki/Dihydrouridine

<biochemistry> An unusual pyrimidine which is the result of adding two hydrogen atoms to a uridine (another nitrogenous base). It is found only in tRNA molecules. ... (09 Oct 1997) ...
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http://www.encyclo.co.uk/local/20973
(hU, hu, D) Type: Term Pronunciation: dī-hī′drō-yūr′i-dēn Definitions: 1. Uridine in which the 5,6-double bond has been saturated by addition of two hydrogen atoms; a rare constituent of transfer ribonucleic acids.
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http://www.medilexicon.com/medicaldictionary.php?t=24868
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