???? ??? ?? ?? ? ????? ? ?? ??? ?? ???? ??? ??? ? ??? ? ??? ? ?? ? ??? ??? ??????.?? ?? ????? ?? ??? ?? ??? ??? ???? ????. A standard neurological attribute of this dysfunction is impaired myelin production (dysmyelination). Myelin is usually a fatty material that insulates nerve cells and encourages the speedy transmission of nerve impulses.????,