Small molecules with point to point transmission . They are released from one neuron and then bind to a receptor . They modulate function of the neuron . They can be released from neuronal and nonneuronal cells . They can travel from brain to kidney.
Oncogenes are quaternary messengers .
Needed For Neurotransmitter 1. Storage and release 3. Action potential cause release of neurotransmitter in quantums. Its tradename is Aldemac. It is an antihypertensive .