... purine alkaloid 嘌呤类生物碱 purine group 嘌呤类（化合物） purine 嘌呤 ...
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Guanine: organic compound of the purine family often called a base consisting of two rings each containing both nitrogen and carbon atoms and an amino group.
鸟嘌呤：嘌呤类的有机化合物，常称为碱基，包含二个环，各含氮原子和碳原子，还有一个氨群。
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