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

四分体时期还出现二分体、三分体、含四分体及多分体。

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）为少见之遗传性疾病，三项主要特徵为皮肤色、 指甲生长及黏膜白斑症。