1. Department of Microbiology and Molecular Genetics, One Shields Avenue, University of California; Davis CA 95616 USA
2. Spatial Regulation of Genomes, Department of Genomes and Genetics, Institut Pasteur; 25-28 Rue du Docteur Roux 75015 Paris France
3. Department of Molecular and Cellular Biology, One Shields Avenue, University of California; Davis CA 95616 USA