1. Institute of Bioprocess Engineering, Friedrich-Alexander-University Erlangen Nürnberg; Paul-Gordan-Straße 3 Erlangen D-91054 Germany
2. Chair for Process Biotechnology; University of Bayreuth; Universitätsstraße 30 Bayreuth D-95447 Germany
3. Division Molecular Immunology, Dept. of Internal Medicine III; Nikolaus Fiebiger Zentrum, Friedrich-Alexander-University Erlangen-Nürnberg; Glückstr. 6 Erlangen D-91054 Germany