Embryology Question:
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What is notochord? How is this structure formed?

Answer:

Notochord is a rodlike structure that forms the supporting axis of the embryo and gives birth to the vertebral column in vertebrates. It is formed by differentiation of mesodermal cells.

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How does the embryo turn from gastrula into neurula? How is the neural tube formed? What is the embryonic origin of the nervous system in vertebrates?What is coelom? To which structures do coeloms give birth? Are all animals coelomate?