| 1. | The absence of hypoblast results in multiple primitive streaks in chicken embryos.
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| 2. | Hence, primitive streak is analogous to the blastopore lip in amphibian gastrulation.
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| 3. | When the primitive streak forms, these cells expand out to become Hensen's node.
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| 4. | This separation is crucial in the formation of the primitive streak.
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| 5. | At the end of the second week, a primitive streak appears.
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| 6. | The primitive streak is key in the development of the major body axes.
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| 7. | Avian gastrulation occurs as cells move though the primitive streak.
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| 8. | In chicken and mouse, Vg1 and Nodal respectively promote primitive streak formation in the epiblast.
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| 9. | Koller's sickle induces primitive streak and Hensen's node, which are major components of avian gastrulation.
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| 10. | The primitive streak develops from Koller s sickle and the epiblast of the avian embryo.
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