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Structure of D4. Cartoon diagram showing a superposition of the structures of UNG from E. coli (bluish white) and human (light cyan) on D4 (light pink). The root-mean-squared deviations for superposition of the human and E. coli UNG structures on that of D4 are 4.51 and 3.76 Å, respectively. Distinctive structural elements of D4 are highlighted in light magenta. The uracil molecule in D4 is shown as a stick model.
