n.[化]嘧啶
The substitution of a purine for a pyrimidine, or vice versa is a transversion. 嘌呤為嘧啶取代或嘧啶為嘌呤所取代，叫做顛換。
The relative merits between "degradable" and "non-degradable" radiolabeled pyrimidine analogues have been compared in this paper. 本文比較可分解及不可分解放射性標幟嘧啶核苷酸之個別優(yōu)點。
