1. Max Planck Institute for Marine Microbiology; Celsiusstraße 1 Bremen 28359 Germany
2. Leibniz Institute DSMZ - German Collection of Microorganisms and Cell Cultures; Inhoffenstraße 7B Braunschweig 38124 Germany
3. Institute for Genome Research and Systems Biology, Center for Biotechnology, University of Bielefeld; Universitätsstraße 27 Bielefeld 33615 Germany