1. Laboratory for Microbiology, Department of Biochemistry and Microbiology, Ghent University, B-9000 Ghent, Belgium
2. InBioS − Center for Protein Engineering, University of Liège, Institut de Chimie, B-4000 Liège, Belgium
3. Department of Biology, California State University Bakersfield, Bakersfield, California 93311-1022, United States