From the Departments of Physiology (Drs. Keszthelyi, Karlik, and Hyduk), Diagnostic Radiology and Nuclear Medicine (Dr. Karlik), and Clinical Neurological Sciences (Drs. Karlik and Rice), University of Western Ontario, London, Ontario, Canada; and Athena Neurosciences (Drs. Gordon, Yednock, and Horner), South San Francisco, CA.
Funding for this work was provided by the Multiple Sclerosis Society of Canada.
Received September 12, 1995. Accepted in final form February 19, 1996.
Address correspondence and reprint requests to Dr. Stephen J. Karlik, Departments of Diagnostic Radiology and Nuclear Medicine, University Hospital, 339 Windermere Road, London, Ontario, N6A 5A5, Canada.
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