1. The Institute of Life Sciences, The Hebrew University of Jerusalem, The Edmond J Safra Campus, 9190401 Jerusalem, Israel
2. Department of Microbiology and Molecular Genetics, Biomedical Physical Sciences, Michigan State University, East Lansing, MI 48824-4320, USA
3. Departamento de Microbiología y Genética, Campus Miguel de Unamuno, Universidad de Salamanca, 37007, Salamanca, Spain