[1] Univ Washington, Dept Lab Med, Seattle, WA 98195 USA
[2] Univ Washington, Dept Neurol, Seattle, WA 98195 USA
[3] Univ Washington, Dept Med, Div Med Genet, Seattle, WA 98195 USA
[4] Univ Washington, Ctr Neurogenet & Neurotherapeut, Seattle, WA 98195 USA
[5] Univ Calif San Diego, Dept Pediat, San Diego, CA 92103 USA
[6] Univ Calif San Diego, Dept Cellular & Mol Med, San Diego, CA 92103 USA