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

#30, Slide 49 of 312

3 weeks

From The Biology of Prenatal Development.Buy Now

Label Key:

1. amnion
2. yolk sac
3. embryo
4. amniotic cavity
All ages referenced to fertilization, not last menstrual period.
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