Acknowledgements We acknowledge support of our research from the European Union (EU Framework Program 6, AGRON-OMICS (LSHG-CT-2006-037704)), the Swiss National Science Foundation, CTI (Swiss Innovation Promotion Agency) and ETH Zurich. We thank the Functional Genomics Center Zurich for support of our profiling experiments. Apologies to all colleagues whose work could not be cited due to space c...