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1·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。

2·Adenine a nitrogenous base (6 - amino - purine) found in DNA and RNA.

腺嘌呤：在DNA和RNA中发现的含氮的碱基(6 -氨基嘌呤)。