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purine bases  a group of compounds of which purine is the base, including adenine, guanine, uric acid, xanthine, and theobromine; adenine and guanine occur in nucleic acids.

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Purine and pyrimidine bases. (A), Purine and some substituted purine bases occurring in nucleic acids; (B), pyrimidine and some substituted pyrimidine bases occurring in nucleic acids.




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