1. Developmental Genetics, Department of Biomedicine, University of Basel, Mattenstrasse 28, CH-4058 Basel, Switzerland.
2. Computational Systems Biology Group, Ecole Polytechnique Federale de Lausanne, Swiss Institute for Experimental Cancer Research and Swiss Institute of Bioinformatics, AAB 0 21 Station 15, CH-1015 Lausanne, Switzerland.
3. Texas A&M Health Science Center, Institute of Biosciences and Technology, 2121 West Holcombe Boulevard, Room 907, Houston, TX 77030, USA.