1. Dipartimento di Scienze Chirurgiche, Università di Cagliari, Cagliari, Italy
2. Institute of Microbiology of the Czech Academy of Sciences, Laboratory of Cell Signaling, Prague, Czech Republic
3. Department of Biology, Indiana University at Bloomington, Bloomington, Indiana, USA
4. Centro Nacional de Biotecnología (CNB), Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
5. Department of Microbiology, University of Kaiserslautern, Kaiserslautern, Germany
6. Department of Microbiology and Molecular Genetics, McGovern Medical School, Houston, Texas, USA