Huret J L, Leonard C, Kanoui V
Clin Genet. 1985 Dec;28(6):541-5. doi: 10.1111/j.1399-0004.1985.tb00423.x.
Analysis of the karyotype of an azoospermic 27-year-old man, without any dysmorphism, showed the presence of a ring chromosome 21.
对一名27岁无精子症男性的核型分析显示,其无任何畸形,却存在一条21号环状染色体。