Here we describe the results of an X-ray diffraction analysis of crystals of N 1-methyl cytosine ... found for purines and pyrimidines, but the structure is unusual in that the two bases do ...
Both uracil and thymine pair with adenine, but they differ in their chemical structure. Thymine has an additional methyl group (-CH3) attached to its pyrimidine ring, while uracil lacks this group.
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