I have to admit, much of the article was over my head. I am learning new terms everyday, today it was 'demyelination disorder':

"A demyelinating disease is any disease of the nervous system in which the myelin sheath of neurons is damaged. This damage impairs the conduction of signals in the affected nerves."

I get the jist that stem derived Schwann cells can repair the myelin and I agree, very promising. What I lose in the verbage is what happened to our own schwann cells and why are they not making repairs on their own?