[1] Brigham & Womens Hosp, Dept Med, Ctr Neurol Dis, Boston, MA 02115 USA
[2] Merck Res Labs, Dept Autoimmune Dis Res, Rahway, NJ 07065 USA
[3] Merck Res Labs, Dept Mol & Cellular Pharmacol, Rahway, NJ 07065 USA
[4] Univ Illinois, Dept Vet Pathobiol, Urbana, IL 61802 USA
[5] Stanford Univ, Sch Med, Dept Pathol, Palo Alto, CA 94304 USA
[6] Vet Affairs Med Ctr, Lab Serv, Palo Alto, CA 94304 USA
[7] Harvard Univ, Sch Med, Dept Genet, Boston, MA 02115 USA
[8] Harvard Univ, Sch Med, Howard Hughes Med Inst, Boston, MA 02115 USA