Author information:
(1)Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and 
Technology, Dr. Aiguader 88, 08003, Barcelona, Spain. estel.aparicio@crg.eu.
(2)Universitat Pompeu Fabra (UPF), Dr. Aiguader 88, 08003, Barcelona, Spain. 
estel.aparicio@crg.eu.
(3)Institut Hospital del Mar d'Investigacions Mèdiques (IMIM), Dr. Aiguader 88, 
08003, Barcelona, Spain. estel.aparicio@crg.eu.
(4)Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and 
Technology, Dr. Aiguader 88, 08003, Barcelona, Spain. carme.arnan@crg.eu.
(5)Universitat Pompeu Fabra (UPF), Dr. Aiguader 88, 08003, Barcelona, Spain. 
carme.arnan@crg.eu.
(6)Institut Hospital del Mar d'Investigacions Mèdiques (IMIM), Dr. Aiguader 88, 
08003, Barcelona, Spain. carme.arnan@crg.eu.
(7)Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and 
Technology, Dr. Aiguader 88, 08003, Barcelona, Spain. ilaria.sala@crg.eu.
(8)Universitat Pompeu Fabra (UPF), Dr. Aiguader 88, 08003, Barcelona, Spain. 
ilaria.sala@crg.eu.
(9)Institut Hospital del Mar d'Investigacions Mèdiques (IMIM), Dr. Aiguader 88, 
08003, Barcelona, Spain. ilaria.sala@crg.eu.
(10)Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and 
Technology, Dr. Aiguader 88, 08003, Barcelona, Spain. nuria.bosch@crg.eu.
(11)Universitat Pompeu Fabra (UPF), Dr. Aiguader 88, 08003, Barcelona, Spain. 
nuria.bosch@crg.eu.
(12)Institut Hospital del Mar d'Investigacions Mèdiques (IMIM), Dr. Aiguader 88, 
08003, Barcelona, Spain. nuria.bosch@crg.eu.
(13)Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and 
Technology, Dr. Aiguader 88, 08003, Barcelona, Spain. roderic.guigo@crg.cat.
(14)Universitat Pompeu Fabra (UPF), Dr. Aiguader 88, 08003, Barcelona, Spain. 
roderic.guigo@crg.cat.
(15)Institut Hospital del Mar d'Investigacions Mèdiques (IMIM), Dr. Aiguader 88, 
08003, Barcelona, Spain. roderic.guigo@crg.cat.
(16)Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and 
Technology, Dr. Aiguader 88, 08003, Barcelona, Spain. rory.johnson@crg.eu.
(17)Universitat Pompeu Fabra (UPF), Dr. Aiguader 88, 08003, Barcelona, Spain. 
rory.johnson@crg.eu.
(18)Institut Hospital del Mar d'Investigacions Mèdiques (IMIM), Dr. Aiguader 88, 
08003, Barcelona, Spain. rory.johnson@crg.eu.