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The Endowment for Human Development
The Endowment for Human Development
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The Limbs Bud


4 weeks, 6 days

From The Biology of Prenatal Development.Buy Now

Script: Upper and lower limb development begins with the appearance of the limb buds by 4 weeks.

All ages referenced to fertilization, not last menstrual period.
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Amniotic Fluid
Amniotic Fluid
The Heart in Action
The Heart in Action
The Limbs Bud
The Limbs Bud
Transparent Skin
Transparent Skin
Cerebral Hemispheres
Cerebral Hemispheres
The Yolk Sac
The Yolk Sac
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