1. Institute of Evolutionary Biology and Environmental Studies; University of Zurich; CH-8057 Zurich Switzerland
2. The Swiss Institute of Bioinformatics; CH-1015 Lausanne Switzerland
3. Centre for Genomic Regulation (CRG); C/Dr. Aiguader 88 08003 Barcelona Spain
4. ETH Zurich and Eawag; CH-8600 Dübendorf Switzerland
5. Institute of Science and Technology; Am Campus 1 3400 Klosterneuburg Austria
6. The Santa Fe Institute; Santa Fe; New Mexico 87501