guanine

例句：

1. 1. Guanine is an essential component of DNA.
   鸟嘌呤是DNA的必需成分。
2. 2. The discovery of guanine led to the development of modern medicine.
   发现鸟嘌呤导致了现代医学的发展。
3. 3. Guanine is a key component in the synthesis of vitamins B and C.
   鸟嘌呤是合成维生素B和C的关键成分。