Final answer:
NGF (neural growth factor) promotes the growth and maintenance of certain neurons and is involved in neural development. It is not a neurotransmitter and does not inhibit nerve regeneration after injury.
Step-by-step explanation:
NGF (neural growth factor) promotes the growth and maintenance of certain neurons. It is a protein molecule and neuropeptide that acts as a chemical signal, released from the synaptic end bulb of a neuron to cause a change in the target cell. NGF is not a neurotransmitter and it does not inhibit nerve regeneration after injury. Instead, it plays a crucial role in neural development and encourages the growth and survival of nerve cells.