Free Blastocyst (without zona)

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This close-up reveals the absence of the zona and the large size of the blastocyst cavity. The inner cell mass is tiny by comparison.

1. inner cell mass

2. blastocyst cavity

All ages referenced to fertilization, not last menstrual period.

Hatched Blastocyst

Free Blastocyst (without zona)

Embryo Cross Section 8-9 Days

Embryo at About 11 Days

Tube Shaped Heart

6 days