EMBL/CRG Research Unit in Systems Biology, Centre for Genomic Regulation-CRG and Universitat Pompeu Fabra-UPF, Barcelona, Spain.|EMBL/CRG Research Unit in Systems Biology, Centre for Genomic Regulation-CRG and Universitat Pompeu Fabra-UPF, Barcelona, Spain.|EMBL/CRG Research Unit in Systems Biology, Centre for Genomic Regulation-CRG and Universitat Pompeu Fabra-UPF, Barcelona, Spain.|EMBL/CRG Research Unit in Systems Biology, Centre for Genomic Regulation-CRG and Universitat Pompeu Fabra-UPF, Barcelona, Spain.|EMBL/CRG Research Unit in Systems Biology, Centre for Genomic Regulation-CRG and Universitat Pompeu Fabra-UPF, Barcelona, Spain.