| 21. | Notochord flexion occurs at around 4 mm standard length in " R . loricata ".
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| 22. | Von Baer studied the embryonic development of animals, discovering the blastula stage of development and the notochord.
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| 23. | Notochord-derived Shh signals to the floor plate, and induces Shh expression in the floor plate.
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| 24. | Loss of Shh from the notochord and / or floor plate prevents proper specification of these progenitor domains.
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| 25. | In the fish and all subsequent vertebrates, the notochord forms the backbone ( or vertebral column ).
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| 26. | A notochord is formed early in development, and always consist of a row of exactly 40 cells.
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| 27. | Instead of true vertebrae, they have a series of cartilaginous structures called arcualia arranged above the notochord.
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| 28. | One of the characteristics linking the specimen to chordates is its notochord, the precursor of a spinal column.
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| 29. | The ectoderm is instructed to become the nervous system by the notochord, which is typically positioned above it.
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| 30. | The lower tube surrounds the notochord, and has a complex structure, often including multiple layers of calcification.
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