以下为句子列表：
英文: Although the incorporation of nondegradable pyrimidine analogues into DNA is usually less efficient than that of the degradable pyrimidines, issues related to radiolabeled metabolites and interpretation of the images is usually simplified.
中文: 不可分解之嘧啶核苷酸与DNA的结合效率较可分解之嘧啶核苷酸为低，但由放射性代谢物及其衍生的影像解释困难问题将会简化。
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英文: Base pairing The bonding relationship between purine and pyrimidine bases in the nucleotides of DNA and RNA.
中文: 碱基配对：在DNA和RNA的核苷酸中，嘌呤和嘧啶之间相匹配的关系。
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英文: Biochemistry) A nitrogenous molecule, either a PYRIMIDINE or a PURINE, that combines with a pentose sugar and phosphoric acid to form a nucleotide, the fundamental unit of nucleic acids.
中文: 2碱基：一种含氮的分子，嘌呤碱或者是嘧啶碱，它们和戊糖还有磷酸一起构成核苷酸，核苷酸是核酸的基本结构单位。
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英文: Clevudine is a pyrimidine analogue with potent and sustained antiviral activity against HBV.
中文: 克来夫定为嘧啶类似物，对HBV具有持续有效的抗病毒活性。
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英文: Effect of ~(211)At on incorporation of pyrimidine nucleoside in muring ehrlich ascites tumor cell
中文: ~(211)At对小鼠艾氏腹水癌细胞摄取嘧啶核苷的影响
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