What could happen to the target cells that lack receptor proteins for ligands from local regulators?
A) They could compensate by receiving nutrients via an a factor.
B) They could develop normally in response to neurotransmitters instead.
C) They could divide but never reach full size.
D) They would not be able to multiply in response to growth factors from nearby cells.
E) Hormones would not be able to interact with target cells.
Answer: D