[1] Univ Calif San Francisco UCSF, Dept Neurol, San Francisco, CA USA
[2] Northwestern Univ, Mcgaw Med Ctr, Dept Med, Chicago, IL USA
[3] UCSF, Weill Inst Neurosci, Dept Neurol, San Francisco, CA USA
[4] Univ Calif San Francisco UCSF, Dept Biochem & Biophys, San Francisco, CA USA
[5] VA Multiple Sclerosis Ctr Excellence East, Washington, DC USA