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The Endowment for Human Development
The Endowment for Human Development
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Three-Cell Embryo

#42, Slide 18 of 312

40 hours

Source: Centro Riproduzione Assistita, Catania, Italy.

Label Key:

1. blastomere #1
2. blastomere #2
3. blastomere #3
4. perivitelline space
5. zona pellucida
6. polar body
All ages referenced to fertilization, not last menstrual period.
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