1. Department of Chemistry, Bagley Hall, University of Washington, Box 351700, Seattle, Washington
98195-1700, United States
2. Seattle Children’s Hospital, 4800 Sand Point Way NE, Seattle, Washington
98105, United States
3. Department
of Genetics, University of Alabama, Birmingham,
Alabama 35294, United
States
4. Department
of Pediatrics, RR 310 Health Science Building, University of Washington, Box 356320, Seattle, Washington
98195-6320, United States
5. Department of Biochemistry, University of Washington, Box 357350,
Seattle, Washington 98195-7350, United States