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Fewer than 3 of blastocysts inserted through IVF successfully implant into the uterus and become newborns


It has been shown that  different countries use different numbers of blastocysts for the IVF, regulated by the law. It is important to keep the blastocyst number low, to decrease the number of multiple pregnancy.



Esoterical

the answer is 3.

The blastocyst is a structure formed in the early development of mammals. It possesses an inner cell mass which subsequently forms the embryo. The outer layer of the blastocyst consists of cells collectively called the trophoblast. This layer surrounds the inner cell mass and a fluid-filled cavity known as the blastocoele.

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