Nature Communications 5: Article number: 486810.1038/ncomms5868 (2014); Published September102014; Updated February262015.
Two affiliations for Fyodor A. Kondrashov were omitted from this Article. The correct affiliations are given below:
Bioinformatics and Genomics Programme, Centre for Genomic Regulation (CRG) 88 Dr. Aiguader, 08003 Barcelona, Spain.
Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain.
Institució Catalana de Recerca i Estudis Avançats (ICREA), 23 Pg. Lluís Companys, 08010 Barcelona, Spain.