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A member asked:
How many cells does an embryo/blastocyst have before it implants? and how many days after its fertilized does it implant?
A doctor has provided 1 answer
About a week: Implantation generally occurs about a week after fertilization. By this time, the embryo is called a blastocyst, which is a ball of many cells (up to hundreds) divided into regions called the trophoblast (the part that will become the placenta) and inner cell mass (part that will become the baby).
Answered 2/9/2015
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