In a dna molecule , the base adenine sticks to thymine , and guanine pairs with cytosine .

腺嘌呤与胸腺嘧啶结合在一起，鸟嘌呤则和胞嘧啶结合成一对。

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。

Whether cytosine methylation is the explanation for this difference has yet to be tested , but something is clearly happening .

胞嘧啶甲基化是否能够解释这种差异还有待考察，但是的确是有些什么东西存在着。

Anyone who studied a little genetics in high school has heard of adenine , thymine , guanine and cytosine .

任何人只要在中学是学过一点遗传学的都应该听说过腺嘌呤，胸腺嘧啶，鸟嘌呤和胞嘧啶。

Construction of recombinant adenovirus containing cytosine deaminase gene and the study of its killing effect on pulmonary carcinoma .

含胞嘧啶脱氨酶基因重组腺病毒的构建及其对肺癌抑制作用的研究。