| 1. | They become expressed in the anterior region of the gastrula embryos.
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| 2. | Vertebrate animals all differentiate from the gastrula the same way.
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| 3. | Enterocoelous development begins once the embryo reaches the gastrula phase of development.
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| 4. | By Day 1 the embryo has hatched as a ciliated gastrula stage ( photograph ).
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| 5. | At this point gastrulation is complete, and the gastrula has a functional digestive tube.
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| 6. | In the early gastrula, most of the tissue in the embryo is not determined.
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| 7. | Named by William Ballard, the pharyngula stage follows the blastula, gastrula and neurula stages.
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| 8. | The early enhancer located in the intermediate region activates the mid-hindbrain region of late gastrula embryos.
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| 9. | During its planktic period the larva proceeds through several developmental phases going from gastrula to bipinnaria to brachiolaria.
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| 10. | An ancestral form existed, known as the gastrea, which was a common ancestor to the corresponding gastrula.
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