附加体，游离体某些细胞的遗传粒子，尤其是细菌细胞，能够自动存在于胞质中或成为染色体的一部分。
A genetic particle of certain cells, especially bacterial cells, that can exist either autonomously in the cytoplasm or as part of a chromosome.
方法：我们开发了基于游离DNA定向分析的方法，用于胎儿21号、18号和13号染色体非整倍体的检测。
METHODS: We developed an assay based on the targeted analysis of cell-free DNA for the detection of fetal aneuploidies of chromosomes 21, 18, and 13.
方法：我们开发了基于游离DNA定向分析的方法，用于胎儿21号、18号和13号染色体非整倍体的检测。
METHODS: We developed an assay based on the targeted analysis of cell-free DNA for the detection of fetal aneuploidies of chromosomes 21, 18, and 13.
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