Affiliation: | aDepartment of Molecular Biology and NCCR program “Frontiers in Genetics,” University of Geneva, 30 quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland; and ;bInstitute of Bioengineering, School of Engineering, Ecole Polytechnique Federale de Lausanne, Station 17, CH-1015 Lausanne, Switzerland |