| PRIMARY
NEURULATION |
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| Neural induction, |
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| formation of the |
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| neural
plate |
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| Formation of |
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| of the neural |
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| groove
and |
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| neural folds |
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| Closure of neural |
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| folds, formation |
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| of
neural tube |
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| and neural crest |
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| Initially, the neural |
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| tube is composed of a |
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| single
layer of |
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| neuroepithelial cells |
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