Gene Function and Evolution, Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain.|Gene Function and Evolution, Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain.|Gene Function and Evolution, Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain.|Gene Function and Evolution, Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain.|Gene Function and Evolution, Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain.|Gene Function and Evolution, Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain.