The neuron that will most likely cause disruption in the flow of information in the brain which undergoes through the neurons is the myelin. If this hardens, this will likely disturb the person's flow of information in the brain and this usually happens when a person has multiple sclerosis.
It is only nucleotide phosphates e.g. adenosine triphosphate (ATP) that stores energy for all cell's use. It is also a molecule that is similar to one of the nucleic acids in DNA and RNA.