嘌呤为嘧啶取代或嘧啶为嘌呤所取代，叫做颠换。
The substitution of a purine for a pyrimidine, or vice versa is a transversion.
结果显示：碱基变异的类型包括转换、颠换和缺失。
The results show that the types of DNA base mutation included the transition, the transversion and the deletion.
以同源性在70%以上的6组同源蛋白为材料，从系统发生的角度研究发生在四倍简并位点上的转换和颠换的关系。
The relationship of transition and transversion of base change in 4-fold degenerate sites of coding genes of 6 proteins, which showed 70% homology in wmposition investigated.
科学家发现位于LTC4S启动子区（-444）腺嘌呤与胸腺嘧啶之间的颠换与心血管疾病亚临床人群存在关联。
The scientists found that the (-444)A>C promoter region polymorphism of LTC4S was associated with subclinical markers of cardiovascular disease (CVD).
科学家发现位于LTC4S启动子区（-444）腺嘌呤与胸腺嘧啶之间的颠换与心血管疾病亚临床人群存在关联。
The scientists found that the (-444)A>C promoter region polymorphism of LTC4S was associated with subclinical markers of cardiovascular disease (CVD).
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