<unk>   is the most common form of a family of genetic diseases known as the<unk> es, diseases which affect the growth and/or development of myelin, the fatty covering which acts as an insulator around nerve fibres throughout the central and peripherial nervous systems .
Metachromatic leukodystrophy
Multiple system atrophy
Kennedy disease
Progressive supranuclear palsy
Carnevale-Canun-Mendoza syndrome
Sandhoff disease
Canavan disease
Spinocerebellar ataxia