| 11. | It is the fibrous remnant of the notochord.
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| 12. | The chorda-mesoderm develops into the notochord.
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| 13. | When the development of the notochord is complete, the neurenteric canal normally closes.
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| 14. | As the ectoderm proliferates, the notochord is dragged into the middle of the developing embryo.
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| 15. | Sonic hedgehog is the secreted protein which mediates signaling activities of the notochord and floor plate.
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| 16. | A postembryonic vestige of the notochord is found in the nucleus pulposus of the intervertebral discs.
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| 17. | Stomochords were initially considered a variant of a primitive notochord, a defining feature of chordates.
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| 18. | He demonstrated that the notochord provides necessary signals to ensure the neural tube s ventral differentiation.
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| 19. | In the middle of the dorsal surface of the embryo is a linear structure called the notochord.
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| 20. | It had a primitive notochord, a structure that could have developed into a vertebral column later.
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