What Changes in the Central Region of the Dorsal Surface

What changes in the central region of the dorsal surface of the single-celled epithelial layer of a chick embryo lead to the formation of the primitive nervous system? (Select all correct responses)

A) a reduction in the expression of E-cadherin genes
B) a reduction in the expression of N-cadherin genes
C) an elevation in the expression of N-cadherin genes
D) an elevation in the expression of E-cadherin genes

Correct Answer:

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