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| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
| pyrimidine |
(p r m´d n´´) (KEY) , type of organic base found in certain coenzymes and in the nucleic acids of plant and animal tissue. The three major pyrimidines of almost universal distribution in living systems are cytosine, thymine, and uracil. |
| The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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