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Description: neural plate (ectoderm) notochord (mesoderm) 0 Chemical signals produced by notochord mesoderm induce the ectoderm above it to thicken and form a neural plate. neural groove 9 Changes in cell shape cause edges of the neural plate to fold in toward the plate center, forming a neural groove. neural tube 9 Further folding causes the edges of the neural plate to meet, forming the neural tube.
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