What is the function of the proteins secreted by cells of the ventral midline of the spinal cord? Choose the correct option
A) Attract (netrin) and then repel (slit) growing axons to help them cross the midline
B) Cause axons to stick together with cell adhesion molecules as they travel down molecular highways
C) Guides later-developing neighbor axons to the same targets
D) Facilitate the mechanism of fasciculation by the expression of specific surface molecules
Ans: A
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