At tetrad stage, dyad, triad, tetrad with micronucleus and polyad appeared.

四体时期还出现二体、三体、含微核的异常四体体。

Dyskeratosis congenita (DKC) is a rare inherited disease characterized by the triad of abnormal skin pigmentation, nail dystrophy, and mucosal leukoplakia.

先天性角化不良症（DKC）为一少见之遗传性疾病，三项主要特徵为皮肤色素异常、 指甲生长异常黏膜白斑症。