1. Department
of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, New York 11794-5215, United States
2. Center
for Structural Biology, Stony Brook University, Stony Brook, New York 11794-5115, United States
3. Departments
of Neurosurgery and Medicine, Stony Brook University, Stony Brook, New York 11794-8122, United States