Fetal DNA fraction estimated from under-representation of chromosome X in male pregnancies and over-representation of chromosomes 13, 18, and 21 from the respective cases of trisomy 13, 18 and 21.
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Fetal DNA fraction estimated from under-representation of chromosome X in male pregnancies and over-representation of chromosomes 13, 18, and 21 from the respective cases of trisomy 13, 18 and 21.
创建时间：
2013-02-21
