| 11. | Mesentoblasts are found in the blastopore area between the endoderm and ectoderm.
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| 12. | Robins said the cells in the early primitive ectoderm develop in two directions.
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| 13. | Ectoderm follows a default pathway to become neural tissue.
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| 14. | They found that ectoderm was more potent than endoderm.
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| 15. | It is formed by ectoderm and endoderm coming into contact with each other.
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| 16. | BMP signals from the epidermis inhibit the formation of placodes in nearby ectoderm.
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| 17. | The ectoderm is the outermost layer of the embryo.
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| 18. | Each tracheal tube develops as an invagination of the ectoderm during embryonic development.
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| 19. | Unlike bilaterians, radiata only have two primordial cell layers, endoderm and ectoderm.
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| 20. | The shells develop from the ectoderm as an organic framework which is subsequently mineralised.
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