1. URPHYM-GEMO, University of Namur, rue de Bruxelles, 61, Namur 5000, Belgium.
2. Singapore–MIT Alliance for Research and Technology Centre (SMART), Center for Life Sciences 05-06, 28 Medical Drive, 117456 Singapore.
3. Massachusetts Institute of Technology, 56-787B77 Massachusetts Avenue, Cambridge, MA 02139-4307, USA.
4. Division of Biological Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan.
5. Department of Microbiology and Molecular Genetics, University of California, Davis, CA 95616, USA.