The male and female pronuclei are indistinguishable from one another.

• The male and female pronuclei are indistinguishable from one another.

• The second polar body can be seen (arrow).

• The plasma membranes of the two pronuclei are dissolving and one diploid nucleus will remain.

Fusion of the pronuclei:

(in vitro)

Advanced Fertility Center of Chicagohttp://www.advancedfertility.com/

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