_:vb50951666 . _:vb50951666 "url:https://www.ncbi.nlm.nih.gov/pubmed/17071802"^^ . _:vb50951666 . _:vb50951666 . _:vb50951666 "A central nervous system disease that is characterized by damage to the myelin sheath present around nerve axons."^^ . _:vb50951666 . _:vb50951666 .