知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 PGT might be performed with polar bodies or an isolated blastomere of the cleavage-stage embryo, usually from the day 3 embryo. It can be done from the sample of cells within the trophectoderm of the blastocyst-stage embryo. The advantage of a trophectoderm sample is steering clear of https://www.ivf.com.mx/