Kleczkowska A, Fryns J P
Ann Genet. 1984;27(2):126-8.
In the present paper we report a phenotypically normal woman with a ring chromosome 21 in her karyotype, who sought genetic counseling because of her previous reproductive failure and whose third, prenatally diagnosed, pregnancy resulted in the delivery of a healthy and karyotypically normal boy.
在本文中，我们报告了一名核型中存在21号环状染色体的表型正常女性，她因先前的生殖失败寻求遗传咨询，其第三次妊娠经产前诊断，最终分娩出一名健康且核型正常的男婴。
