It turned out that 7 cases were found with trisomy 21.4 cases among the 9 916 negative-screening cases were born with trisomy 21,according to the analysis of the chromosome karyotypes in peripheral blood.
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释义
在筛查阴性的9 916例中,出生DS患儿4例,经外周血染色体核型分析证实为21三体。
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