Around day 14 of the embryonic period, the _____ appears. It will eventually become the neural tube.

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Around day 14 of the embryonic period, the primitive streak appears. This is a groove in the layer of cells on the surface of the embryo that marks the beginning of gastrulation, a process in which the cells begin to differentiate and form layers. The primitive streak eventually gives rise to the neural tube, which will become the brain and spinal cord.

Around Day 14 of the Embryonic Period, the _____ Appears