1. Center for Genomics Research, Karolinska Institute, Berzelius väg 37, 171 77, Stockholm, Sweden1
2. Center for Biomolecular Recognition, Panum Institute, Blegdamsvej 3c, DK 2200 Copenhagen N., and Pantheco A/S, Fruebjergvej 3, DK 2100 Copenhagen Ø., Denmark2