1. Department
of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, United States
2. Department
of Molecular, Cellular and Developmental Biology, Yale University, P.O. Box 208103, New Haven, Connecticut 06520-8103, United States
3. Department
of Cell Biology, Yale University School of Medicine, P.O. Box 208002, New
Haven, Connecticut 06520-8002, United States