Hi you guys I am having trouble with the cell communication chapter so I would really appreaciate if someone could help out with this question

"What could happen to the target cells in an animal that lack receptors for local regulators?"
I know that some regulators found in animals are gwoth factors that stimulate cells to grow and multiply. so a possible answer could be that the cells would not be able to multiply but I do not know if they could develop normally in response to neurotransmitters instead. Please help me. Thank you in advance. :)