1. Contribution from the Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602, Department of Chemistry and Biochemistry, Hope College, 35 East 12th Street, Holland, Michigan 49423, Département de Biochimie, Université de Montréal, C.P. 6128 Succursale Centre-Ville, Montréal, Qc. Canada, H3C 3J7, and Department of Biochemistry, Molecular Biology and Cell Biology,...