[1] UNIV COPENHAGEN,PANUM INST,DEPT BIOCHEM C,BLEGDAMSVEJ 3,DK-2200 COPENHAGEN N,DENMARK
[2] UNIV COPENHAGEN,PANUM INST,PROT LAB,DK-2200 COPENHAGEN N,DENMARK
[3] UNIV COPENHAGEN,PANUM INST,DEPT BIOCHEM B,DK-2200 COPENHAGEN N,DENMARK
[4] UNIV COPENHAGEN,INST BIOCHEM GENET,DK-1353 COPENHAGEN K,DENMARK
[5] SWISS FED INST TECHNOL,BIOCHEM LAB 2,CH-8092 ZURICH,SWITZERLAND