1. Department of Biochemistry and
Fels Research Institute, Temple University School of Medicine, 3307 North Broad Street, Philadelphia, Pennsylvania
19140, United States
2. Department
of Biology, University of Copenhagen, Ole
Maaløes Vej 5, DK-2200
Copenhagen N, Denmark
3. Department
of Biochemistry, Albert Einstein College of Medicine, 1300 Morris Park
Avenue, Bronx, New York 10461, United States