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1·There are several options to deliver the cytosine gene.

有几个选项，以提供胞嘧啶基因。

2·There are just four kinds: adenine, thymine, guanine and cytosine.

只有4种：腺嘌呤、胸腺嘧啶、鸟嘌呤和胞核嘧啶。

3·Adenine and guanine are purines and cytosine and thymine are pyrimidines.

腺嘌呤和鸟嘌呤是嘌呤和胞嘧啶和胸腺嘧啶是嘧啶。

4·Researchers at purdue university used synthetic forms of guanine and cytosine.

美国普渡大学的研究人员使用的是合成的鸟嘌呤与胞嘧啶。

5·The other two, thymine and cytosine, are single ring structures called pyrimidines.

另两个为胸腺嘧啶和胞嘧啶，即称为嘧啶的单环结构。

6·To make Z-DNA typically requires a stretch of alternating cytosine and guanine bases.

形成Z-DNA通常需要一段交替出现的胞嘧啶与鸟嘌呤碱基。

7·Methods Cidofovir was synthesized via 6-step reactions with cytosine as the starting material.

方法以胞嘧啶为起始原料，经六步反应合成西多福韦。

8·The team looked at methylation, in which a methyl group is placed onto cytosine in DNA sequences.

工作小组关注甲基化作用，是指一个甲基群被放在DNA序列的胞嘧啶上面。

9·A white, crystalline nucleoside, C9H13N3O5, composed of one molecule each of cytosine and ribose.

胞苷一种白色的晶状核苷，c9h13n3o5，由每个。

10·The methyl groups are attached only to specific cytosine bases - one of the four building blocks of DNA.

这些甲基团只粘附于特定胞嘧啶碱基- DNA四个组成成分之一。