The International Life Sciences Institute (ILSI) is a scientific foundation which addresses critical health and safety issues of national and international concern. ILSI promotes international cooperation by providing the mechanism for sci entists from government, industry and universities to work together on co operative programs to generate and disseminate scientific data. The members and trustees of the Institute believe that questions regarding health and safety are best resolved when scientists can examine and discuss issues, as an in dependent body, separate from the political pressures...

Recent years have witnessed dramatic advances in the development and use of magnetic resonance imaging (MRI) techniques that can provide quantitative measures with some degree of pathological specificity for the heterogeneous substrates of multiple sclerosis (MS). Magnetic resonance spectroscopy (MRS) is one of the most promising of these techniques. Thanks to MRS, axonal damage is no longer considered an end-stage phenomenon typical of only the most destructive lesions and the most unfortunate cases, but rather as a major component of the MS pathology of lesions and normal-appearing white...