NOTOCHORDS
\nˈɒtəkˌɔːdz], \nˈɒtəkˌɔːdz], \n_ˈɒ_t_ə_k_ˌɔː_d_z]\
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The rod-shaped body, composed of cells derived from the mesoblast and defining the primitive axis of the embryo. In lower vertebrates, it persists throughout life as the main axial support of the body, but in higher vertebrates it is replaced by the vertebral column.
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