The new screening tecnique, called comparative genomic hybridisation, allows doctors to remove cells from an embryo when it is a few days old.
新的胚胎筛检技术称为基因组杂交比较，允许医生从几天大的胚胎上提取细胞。
The technique, called polar body array comparative genomic hybridisation, is the first that can check all of an egg's chromosomes to see if any are missing or duplicated.
这项新的技术是利用一种叫作极体的物质携带CGH，它能率先检测出卵细胞的染色体是否丢失是否已经复制。
The technique, called polar body array comparative genomic hybridisation, is the first that can check all of an egg's chromosomes to see if any are missing or duplicated.
这项新的技术是利用一种叫作极体的物质携带CGH，它能率先检测出卵细胞的染色体是否丢失是否已经复制。
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