[1] Harvard Univ, Sch Med, Dept Genet, Boston, MA USA
[2] Broad Inst Harvard, Program Med & Populat Genet, Cambridge, MA USA
[3] MIT, Cambridge, MA 02139 USA
[4] Harvard Med Sch, Dept Neurol, Boston, MA USA
[5] Brigham & Womens Hosp, Ctr Neurol Dis, Div Mol Immunol, Boston, MA 02115 USA
[6] Univ Calif San Francisco, Dept Neurol, San Francisco, CA 94143 USA