C to U


cytosine (C) conversion to uracil (U) by deamination.

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purine pyrimidine




Adenine and guanine are purines and cytosine, uracil, and thymine are pyrimidines.



Left - purine (smaller molecule with bigger name) and (right) pyrimidine (larger molecule with smaller name)


grey - carbon / white - hydrogen / blue - nitrogen

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T U mismatch


thymine (T) and uracil (U) differ only in the CH3 group on T, and may be mismatched.

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uracil

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. . . since 10/06/06