MR-Revealed Myelination in the Cerebral Corticospinal Tract as a Marker for Pelizaeus-Merzbacher's Disease with Proteolipid Protein Gene Duplication ==================================================================================================================================================== * Jun-ichi Takanashi * Katsuo Sugita * Yuzo Tanabe * Kasumi Nagasawa * Ken Inoue * Hitoshi Osaka * Yoichi Kohno