Once a structure is fully grown and mature, it will probably
A. down-regulate its receptors for growth hormone, as it no longer receives as much of the ligand.
B. up-regulate its receptors for growth hormone, as it no longer needs to continue to grow at a fast rate.
C. up-regulate its receptors for growth hormone, as it no longer receives as much of the ligand.
D. down-regulate its receptors for growth hormone, as it no longer needs to continue to grow at a fast rate.
Answer: D
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