1. CNAG-CRG, Centre for Genomic Regulation (CRG), Barcelona Institute of Science and Technology (BIST), Baldiri i Reixac 4, 08028 Barcelona, Spain
2. Universitat Pompeu Fabra (UPF), Barcelona, Spain
3. Roche Innovation Center Basel, F. Hoffmann-La-Roche Ltd, Basel, Switzerland, and
4. Department of Microbiology & Immunology, Georgetown University Medical Center, Washington