Multiple Choice
The apical ectodermal ridge forms at the boundary between regions expressing ________________.
A) Wnt-7a and En-1
B) Shh and Msx-1
C) Wnt-7a and Shh
D) En-1 and Msx-1
E) Wnt-7a and Msx-1
Correct Answer:

Verified
Correct Answer:
Verified
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