| 1. | This polar lobe forms at the vegetal pole during cleavage, and then gets shunted to the D blastomere.
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| 2. | The animal pole consists of small cells that divide rapidly, in contrast with the vegetal pole below it.
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| 3. | It is thought that these contacts allow the YSL to " tow " the EVL towards the vegetal pole.
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| 4. | The vegetal pole contains large yolky cells that divide very slowly, in contrast with the animal pole above it.
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| 5. | The cytoplasm in the vegetal pole specifies this axis and removing this cytoplasm leads to a loss of axis information.
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| 6. | This layer forms when the cells at the vegetal pole of the blastoderm combine with the yolk cell underneath it.
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| 7. | The axis of symmetry passes through on one side the animal pole, and on the other side the vegetal pole.
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| 8. | The blastoderm begins to thin as it spreads toward the vegetal pole of the embryo until it has completely engulfed the yolk cell.
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| 9. | The YSL also moves towards the vegetal pole, spreading along the surface of the yolk and migrating slightly ahead of the blastomeres.
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| 10. | The anterior / posterior axis lies along the animal / vegetal axis set up during nuclei at the vegetal pole of the blastula.
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