[1] Washington Univ, Sch Med, Dept Neurol, St Louis, MO 63110 USA
[2] Washington Univ, Sch Med, Dept Mol Biol & Pharmacol, St Louis, MO 63110 USA
[3] Washington Univ, Sch Med, Ctr Study Nervous Syst Injury, St Louis, MO 63110 USA
[4] Washington Univ, Sch Med, Dept Pediat, St Louis, MO 63110 USA
[5] Washington Univ, Sch Med, Dept Cell Biol & Physiol, St Louis, MO 63110 USA
[6] Univ Calif San Francisco, Dept Neurol, San Francisco, CA 94143 USA
[7] Univ Calif San Francisco, Dept Pediat, San Francisco, CA 94143 USA