1. IRB-BSC Joint Research Program in Computational Biology, Barcelona Supercomputing Center, Torre Girona, C/Jordi Girona 31, Barcelona 08034, Spain
2. IRB-BSC Joint Research Program in Computational Biology, Institute for Research in Biomedicine, Parc Cientific de Barcelona, C/Baldiri Reixac 10, Barcelona 08028, Spain
3. Departament de Bioquímica, Facultat de Biologia, Avgda Diagonal 647, Barcelona 08028, Spain