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

#31, Slide 50 of 312

3 weeks

From The Biology of Prenatal Development.Buy Now

Label Key:

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