triad

1.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、含微核的异常四分体及多分体。

2.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（DKC）一少见之遗传性疾病，三项主要特徵皮肤色素异常、 指甲生长异常及黏膜白斑。