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, purin  
1    a colourless crystalline solid that can be prepared from uric acid. Formula: C5H5N4  
2      (Also called)    purine base   any of a number of nitrogenous bases, such as guanine and adenine, that are derivatives of purine and constituents of nucleic acids and certain coenzymes  
     (C19: from German Purin; see pure, uric, -ine2)  
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purine base, purin, purline, puri

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