1. Dept. of Biotechnology; Delft University of Technology, Van der Maasweg 9; Delft 2629 HZ the Netherlands
2. DSM Biotechnology Center, Alexander Fleminglaan 1; AX Delft 2613 the Netherlands
3. Synthon Biopharmaceuticals BV, Microweg 22; GN Nijmegen 6503 the Netherlands