[1] Weizmann Inst Sci, Dept Mol Cell Biol, IL-76100 Rehovot, Israel
[2] Vet Affairs Med Ctr, Seattle, WA 98108 USA
[3] Univ Washington, Dept Med, Seattle, WA 98195 USA
[4] Univ Washington, Dept Neurol, Seattle, WA 98195 USA
[5] Univ Washington, Dept Pharmacol, Seattle, WA 98195 USA