Multiple Choice
During early embryonic development, a protein called sonic hedgehog is released from a cell and travels in a small gradient through the interstitial fluid only to nearby cells. This helps to establish the path and direction of development for the nervous system and limbs. Knowing this, sonic hedgehog must be a(n) ________ signal.
A) endocrine
B) paracrine
C) autocrine
D) nervous
Correct Answer:
Verified
Correct Answer:
Verified
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