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There are three kinds of neurulation: primary, secondary, and junctional neurulation. Primary neurulation forms the anterior portion of the neural tube in most vertebrates. It is due to the edges of the neural plate turning upwards to form neural folds and a neural groove. The neural folds then come together and fuse. In secondary neurulation, mesenchymal cells migrate underneath the epidermis to form the neural tube. This typically forms the posterior end of the neural tube. Junctional neurulation occurs in the transition zone between primary

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