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然后他们记录了产生新的胸腺嘧啶键形成的反应。Then they timed the reactions that caused the new thymine bonds to form.

腺嘌呤和鸟嘌呤是嘌呤和胞嘧啶和胸腺嘧啶是嘧啶。Adenine and guanine are purines and cytosine and thymine are pyrimidines.

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在细胞生长和再生中也很重要，参与了嘌呤和嘧啶的合成。It is important in the growth and reproduction of cells, participating in the synthesis of purines and thymine.

维生素B12是胸腺嘧啶核糖核苷酸合成以及最终DNA生物合成与转录所必需的甲基转移的辅酶。Vitamin B12 is thymine RNA synthesis and DNA biosynthesis and transcriptional required for methyl transfer of coenzyme.

唯一的区别在于，在RNA复制中，胸腺嘧啶被密切联系的、常被缩写为U的碱基尿嘧啶替换。The only difference is that in the RNA copy, thymine is replaced with the closely related base uracil, commonly abbreviated U.

胸苷和腺嘌呤在乙酰短杆菌作用下转化成胸腺嘧啶和目标产物2’-脱氧腺苷。Thymine and the objective product, 2'-deoxyadenosine, were enzymatically transferred from thymidine and adenine by Brevibacterium acetylium.

嘧啶类由嘧啶衍生出来或在结构上与嘧啶有关的一种基本混合物尤指核酸组成的尿嘧啶。Any of several basic compounds derived from or structurally related to pyrimidine, especially the nucleic acid constituents uracil, cytosine, and thymine.

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经过大约1000代的培养，原代细胞那些将5-氯尿嘧啶用作胸腺嘧啶的完全替代品的后代可被获取。After a culture period of about 1000 generations descendants of the original strain were obtained which used 5-chlorouracil as complete substitute for thymine.

这表示棉酚很可能以共轭平面平行地插入到DNA分子双螺旋结构的碱基片层之间，与其中的胸腺嘧啶碱基以弱相互作用的极性键形成复合物。It is probably that the conjugated plane of gossypol is inserted into the base pair pleated sheet of the DNA double helical structure to associate with thymine through weak polar bond.

甲基叶酸盐在嘌呤和胸腺嘧啶生物合成中是无活性的，而B12的主要功能之一是从甲基叶酸盐传递甲基组提供胆碱合成。Methyl folate is inactive in purine and thymine biosynthesis and one of the main functions of vitamin B12 is the transfer of methyl groups from methyl folate for the synthesis of choline.