| 1. | In some protostomes, the embryonic blastocoele persists as a body cavity.
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| 2. | A blastula is a sphere of cells surrounding a blastocoele.
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| 3. | The blastocoele also allows blastomeres to move during the process of gastrulation.
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| 4. | In mouse embryo, blastocoele formation begins at the 32-cell stage.
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| 5. | The blastula stage of early embryo development begins with the appearance of the blastocoele.
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| 6. | The animal cap forms the roof of the blastocoele and goes on primarily to form ectodermal derivatives.
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| 7. | This layer surrounds the inner cell mass and a fluid-filled cavity known as the blastocoele.
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| 8. | From the stage of having 128 cells, the embryo develops a cavity, the blastocoele, and is called a blastula.
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| 9. | During this process, water enters the embryo, aided by an osmotic gradient which is the result of epithelial cells that line the blastocoele.
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| 10. | A common feature of a vertebrate blastula is that it consists of a layer of blastomeres, known as the blastoderm, which surrounds the blastocoele.
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