Bases (nitrogen-containing rings) Purines N 8 7 9 5 4 6 5 6 3 ring numbering system 1 2 Pyrimidines N 2 1 N ring numbering system N ZH N H NH₂ N N NH₂ N N Adenine CH3 Cytosine N H N ZI NH N NH₂ Guanine NH O Thymine ZH NH O Uracil

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A:

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