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A member asked:

How many cells does an embryo have to be before it implants? when does cell division start?

A doctor has provided 1 answer
Dr. Jie Xu answered

Specializes in Obstetrics and Gynecology

Cell division starts: Right after fertilization. The blastocyst is the preimplantation embryo. It has a varying cell number (30 to 200).

Answered 3/26/2016

5.2k views

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