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( Purine)
214 °C The general term purines also refers to substituted purines and their tautomers. The purine is the most widely distributed nitrogen-containing heterocycle in nature.[1] The quantity of naturally occurring purines produced on earth is enormous, as 50&_160;% of the bases in nucleic acids, adenine (2) and guanine (3), are purines. In DNA, these bases form hydrogen bonds with their complementary pyrimidines thymine and cytosine. This is called complementary base pairing. In RNA, the complement of adenine is uracil (U) instead of thymine.
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