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The Yolk Sac
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Script: The yolk sac contains early reproductive cells called germ cells. By 5 weeks these germ cells migrate to the reproductive organs adjacent to the kidneys. | ||
| All ages referenced to fertilization, not last menstrual period. |
Transparent Skin
Cerebral Hemispheres
The Yolk Sac
The Liver and Heart
Hand Plates and Cartilage
Brainwaves
