1. Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany
2. Department of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 22, 14195 Berlin, Germany
3. German Consulting Laboratory for Toxoplasma, Institute for Medical Microbiology, University Medical Center Göttingen, 37075 Goettingen, Germany