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The notochord is a flexible rod-like structure found in the embryos of all chordates, serving as a primary axis of support during development. Its main function is to provide structural support to the developing organism, allowing for the proper formation of the body plan. The notochord also plays a crucial role in signaling surrounding tissues, guiding the development of the spine and nervous system. Over time, the notochord is often replaced by the vertebral column in vertebrates, but its significance in the early stages of development is paramount.
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