1. Department of Structural Biology and Biochemistry, The Hospital for Sick Children, 555 University Avenue, Toronto, ON, Canada M5G 1X8
2. Department of Biochemistry, University of Toronto, 1 King's College Circle, Toronto, ON, Canada M5S 1A8
3. Burnham Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, U.S.A.
4. Department of Molecular and Medical Genetics, University of Toronto, 1 King's College Circle, Toronto, ON, Canada M5S 1A8
5. Department of Paediatrics, University of Toronto, 1 King's College Circle, Toronto, ON, Canada M5S 1A8
6. Department of Medicine, University of Toronto, 1 King's College Circle, Toronto, ON, Canada M5S 1A8
7. Department of Laboratory Medicine and Pathobiology, University of Toronto, 1 King's College Circle, Toronto, ON, Canada M5S 1A8
8. Department of Chemistry, University of New Hampshire, Durham, NH 03824, U.S.A.
9. Protein Chemistry Center, Faculty of Medicine of Ribeirao Preto, University of Sao Paulo, Av. Bandeirantes, 3900, 14049-900 Ribeirao Preto/SP, Brazil