1. Institute of Biochemical Genetics, University of Copenhagen, Øster Farimagsgade 2A, DK-1353 Copenhagen K, Denmark
2. Center for Advanced Research in Biotechnology, 9600 Gudelsky Drive, Rockville MD 20850, U.S.A.
3. Novo Nordisk A/S, Novo Alle, 2880 Bagsværd, Denmark