| 11. | Compared to mesoderm specification, endoderm specification requires a higher expression of Nodal.
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| 12. | It marks cells destined to be mesoderm and endoderm.
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| 13. | Unlike bilaterians, radiata only have two primordial cell layers, endoderm and ectoderm.
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| 14. | In plant biology, endoderm corresponds to the innermost part of the cell layer.
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| 15. | The endoderm of the archenteron will fuse with the ectoderm of the blastocoel wall.
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| 16. | The endoderm allows them to develop true tissue.
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| 17. | The immature ova originate from cells from the dorsal endoderm of the yolk sac.
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| 18. | Gsc is found in high concentrations in the dorsal mesoderm and endoderm during gastrulation.
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| 19. | Their endoderm consists of a proximal digestive and a distal non-digestive section.
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| 20. | The ventral depression is actually a glandular epithelium, as opposed to invaginating endoderm.
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