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.

• 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。